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/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera/Results_I2_iqtree/Orthogroups/Orthogroups_CladeAssignment_WithCopyStatus_cleaned.csv	data/orthofinder/Polyneoptera/Results_I2_iqtree/Orthogroups/Orthogroups_CladeAssignment_WithCopyStatus_cleaned.csv
/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera	data/orthofinder/Polyneoptera
/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data	data
/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/HYPHY_selection	data/HYPHY_selection

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Testing for signatures of selection using HyPhy: aBSREL, BUSTED and RELAX

Note: We used OrthoFinder results, PAL2NAL and HyPhy to identify signatures of selection in orthologous genes. For this part, refers to the well curated pipeline FormicidaeMolecularEvolution by Megan Barkdull (Assistant Curator of Entomology at the Natural History Museum of Los Angeles County). We describe below the modifications made and mostly copied the workflow from her Github.

We will be running three methods on our tree:

Has a gene experienced positive selection at any site in a locust species or group of species? To answer this question, we will apply BUSTED (Branch-Site Unrestricted Statistical Test for Episodic Diversification). This method works well for datasets with fewer than 10 taxa and helps identify positive selection events associated with species or groups.
Are certain species in the Schistocerca phylogeny subject to episodic (at a subset of sites) positive or purifying selection? For this analysis, we will use aBSREL (adaptive Branch-Site Random Effects Likelihood), the preferred method for detecting episodic selection on individual branches within the locust phylogeny.
Have selection pressures on genes been relaxed or intensified in a subset of Schistocerca species? For this, we will use RELAX which is not designed to detect positive selection but rather to determine whether selection pressures have been relaxed or intensified along a specified set of “test” branches.

1. Parsing orthogroups files for PAL2NAL

The script written by M. Barkdull remains unchanged; however, it requires R with the phylotools package installed. This step ensures that the OrthoFinder FASTA file is reordered. Instead of having one file per orthogroup, this process consolidates the data into species-specific files, with all orthogroups combined and properly reordered. These files will be input for PAL2NAL, which is a program that converts a multiple sequence alignement of proteins and the corresponding DNA sequences (here cds) into a codon alignment.

srun --ntasks 1 --cpus-per-task 8 --mem 50G --time 04:00:00 --pty bash

ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1 MCScanX/2024.19.19
export R_LIBS=$SCRATCH/R_LIBS_USER/

# Example for Schistocerca only  
./scripts/DataMSA.R ./scripts/inputurls_Schistocerca_Jan2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Schistocerca_I2/5_OrthoFinder/fasta/Results_Jan15_I2/MultipleSequenceAlignments/
  
# Example for Polyneoptera
./scripts/DataMSA.R ./scripts/inputurls_13polyneoptera_May2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/MultipleSequenceAlignments/

This is the final messages we get when it is successful.

Once we have obtained all the files, we go to the next step which is filtering the protein alignment files to contain only the subset of genes that will be called by PAL2NAL. This is due to the fact that certain genes were not classified in orthogroups.

ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1
export R_LIBS=$SCRATCH/R_LIBS_USER/

# Example for Schistocerca only  
./scripts/FilteringCDSbyMSA.R ./scripts/inputurls_Schistocerca_Jan2025.txt 

# Example for Polyneoptera
./scripts/FilteringCDSbyMSA.R ./scripts/inputurls_13polyneoptera_May2025.txt

Some of the files seems to have discrepancy of one “>” entry line between the protein and cds file (due to a concatenation error that I could not troubleshoot) so we are going to run the script doublecheckCDSbyMAS which I created to remove extra line.

# Example for Schistocerca only 
./scripts/doublecheckCDSbyMAS ./scripts/inputurls_Schistocerca_Jan2025.txt 

# Example for Polyneoptera
./scripts/doublecheckCDSbyMAS ./scripts/inputurls_13polyneoptera_May2025.txt 

# You can also check if there is a difference with the following quick steps
grep ">" ./6_1_SpeciesMSA/proteins_Sscub.fasta | sort > proteins_Sscub_names.txt
grep ">" ./6_2_FilteredCDS/filtered_Sscub_cds.fasta | sort > cds_Sscub_names.txt
diff proteins_Sscub_names.txt cds_Sscub_names.txt

The following is the content of doublecheckCDSbyMAS:

#!/bin/bash

# Check if input file is provided
if [ "$#" -lt 1 ]; then
  echo "Usage: $0 <input_file>"
  exit 1
fi

# Input file containing species information
input_file=$1

# Directories
protein_dir="./6_1_SpeciesMSA"
cds_dir="./6_2_FilteredCDS"
backup_dir="$protein_dir/backup"
log_file="./cleaning_check.log"

# Create necessary directories
mkdir -p "$backup_dir"
rm -f "$log_file"  # Clear previous logs

# Extract species abbreviations (no header in the file)
species_list=$(awk -F',' '{print $4}' "$input_file")

# Loop through each species
for species in $species_list; do
  protein_file="$protein_dir/proteins_${species}.fasta"
  cds_file="$cds_dir/filtered_${species}_cds.fasta"
  cleaned_protein_file="$protein_dir/proteins_${species}_cleaned.fasta"
  cleaned_cds_file="$cds_dir/filtered_${species}_cds_cleaned.fasta"

  echo "Processing species: $species"

  # Check if protein and CDS files exist
  if [[ -f "$protein_file" && -f "$cds_file" ]]; then
    # Backup the original protein file
    cp "$protein_file" "$backup_dir/proteins_${species}.fasta.bak"
    echo "Backup created for: $protein_file -> $backup_dir/proteins_${species}.fasta.bak"

    # Cleaning Step: Align sequence headers between protein and CDS files
    grep ">" "$protein_file" | sort > proteins_names.txt
    grep ">" "$cds_file" | sort > cds_names.txt

    # Identify common sequence headers
    comm -12 proteins_names.txt cds_names.txt > common_names.txt

    # Check if common_names.txt is empty (indicating no matching headers)
    if [[ ! -s common_names.txt ]]; then
      echo "ERROR: No common sequence headers found for species: $species" >> "$log_file"
      echo "ERROR: Cleaning failed for species: $species due to no matching sequence headers."
      continue
    fi

    # Filter protein file
    grep -A 1 -Ff common_names.txt "$protein_file" > "$cleaned_protein_file" || {
      echo "ERROR: Failed to clean protein file for species: $species" >> "$log_file"
      continue
    }

    # Filter CDS file
    grep -A 1 -Ff common_names.txt "$cds_file" > "$cleaned_cds_file" || {
      echo "ERROR: Failed to clean CDS file for species: $species" >> "$log_file"
      continue
    }

    # Replace the original files with cleaned versions
    mv "$cleaned_protein_file" "$protein_file"
    mv "$cleaned_cds_file" "$cds_file"

    # Perform grep check to validate cleaning
    grep ">" "$protein_file" | sort > proteins_names_cleaned.txt
    grep ">" "$cds_file" | sort > cds_names_cleaned.txt
    diff_output=$(diff proteins_names_cleaned.txt cds_names_cleaned.txt)

    if [[ -z "$diff_output" ]]; then
      echo "Check passed for species: $species" >> "$log_file"
      echo "Protein and CDS sequence names match for species: $species."
    else
      echo "Check failed for species: $species" >> "$log_file"
      echo "Protein and CDS sequence names mismatch for species: $species." >> "$log_file"
      echo "$diff_output" >> "$log_file"
    fi

  else
    echo "ERROR: Missing files for species: $species" >> "$log_file"
    echo "ERROR: Protein or CDS file missing for species: $species. Skipping."
  fi
done

# Cleanup temporary files
rm -f proteins_names.txt cds_names.txt common_names.txt proteins_names_cleaned.txt cds_names_cleaned.txt

echo "All species processed. Logs saved to $log_file."

2. Generating codon-aware nucleotide alignments

PAL2NAL is installed on Grace as a module but the same version is available in the script of this repository. We will use the inputs generated in the previous step to obtain codon-aware alignments.

# Example for Schistocerca only 
./scripts/DataRunPAL2NAL ./scripts/inputurls_Schistocerca_Jan2025.txt  

# Example for Polyneoptera 
./scripts/DataRunPAL2NAL ./scripts/inputurls_13polyneoptera_May2025.txt

3. Assembling nucleotide sequence orthogroups for input in HyPHY

From M. Bardull: For some models like BUSTED, we need files that contain orthologous nucleotide sequences from each species. Therefore, we must recombine our codon-aware alignments in a step that is the inverse of previous steps. To do this, use the R script ./scripts/DataSubsetCDS.R. Run with the command:

ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1
export R_LIBS=$SCRATCH/R_LIBS_USER/

# Example for Schistocerca only 
./scripts/DataSubsetCDS.R ./scripts/inputurls_Schistocerca_Jan2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Schistocerca_I2/5_OrthoFinder/fasta/Results_Jan15_I2/MultipleSequenceAlignments/
  
# Example for Polyneoptera 
 ./scripts/DataSubsetCDS.R ./scripts/inputurls_13polyneoptera_May2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/MultipleSequenceAlignments/

From M. Bardull: BUSTED will not run on sequences which contain stop codons, even if these are reasonable, terminal stop codons. HypPhy includes a utility which will mask these these terminal stop codons in the orthogroups (there should be few-to-no other stop codons, because our alignments are codon-aware). To execute this step, use the following:

module purge  
ml GCC/13.3.0  OpenMPI/5.0.3 HyPhy/2.5.71

./scripts/DataRemoveStopCodons

# for large groups launch it with sbatch
sbatch ./scripts/DataRemoveStopCodons

4. Preparing labeled phylogenies

Before performing a signature of selection analysis using HyPhy, it is important to note that some methods such as RELAX, require the phylogeny to have labeled branches to define branches. These labels define branch sets for selection testing and allow to compare selection pressures.

So we modify the script LabellingPhylogeniesHYPHY.R

ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1
export R_LIBS=$SCRATCH/R_LIBS_USER/

# Example for Schistocerca only   
./scripts/LabellingPhylogeniesHYPHY.R /scratch/group/songlab/maeva/LocustsGenomeEvolution/Schistocerca_I2/5_OrthoFinder/fasta/Results_Jan15_I2/Resolved_Gene_Trees/ Locusts.txt Locusts

# Example for Polyneoptera 
./scripts/LabellingPhylogeniesHYPHY.R /scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Resolved_Gene_Trees/ Locusts.txt Locusts

How it appears when it is successful. You can see that the locust species are labelled with {Foreground}.

After running BUSTED one time, I realized that I want to check the signal of selection only on Schistocerca and Locusta. For that, I am pruning the trees and the fasta files of Polyneoptera if I want to keep it with the following script PruningLabellingPhylogeniesHYPHY.R:

ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1
export R_LIBS=$SCRATCH/R_LIBS_USER/
  
  # Example for Polyneoptera 
./scripts/PruningLabellingPhylogeniesHYPHY.R /scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Resolved_Gene_Trees/ Locusts.txt Species2keep.txt Locusts

How the input files should look:

[maeva-techer@grace1 Polyneoptera_FINAL]$ cat Species2keep.txt 
Samer
Sscub
Snite
Sgreg
Scanc
Spice
Lmigr

Details of the PruningLabellingPhylogeniesHYPHY.R are pasted below. If we used these folders, we will have to modify our Run{HYPHYMETHOD} to reflect the source of the new fasta sequences in 8_2_RemovedStops_Pruned:

[maeva-techer@grace1 Polyneoptera_FINAL]$ cat scripts/PruningLabellingPhylogeniesHYPHY.R 
#!/usr/bin/env Rscript

# ============================= #
#        LOAD LIBRARIES        #
# ============================= #
suppressPackageStartupMessages({
  library(fs)
  library(Biostrings)
  library(ape)
  library(tidyverse)
  library(purrr)
})

# ============================= #
#         READ ARGUMENTS       #
# ============================= #
args <- commandArgs(trailingOnly = TRUE)
if (length(args) < 3) {
  stop("Usage: Rscript LabelAndPruneTreesHYPHY.R <tree_dir> <foreground_species.txt> <retained_species.txt>", call. = FALSE)
}

tree_dir <- args[1]
fg_species_file <- args[2]
retained_species_file <- args[3]
output_prefix <- ifelse(length(args) >= 4, args[4], "labelled")

# ============================= #
#       READ SPECIES FILES     #
# ============================= #
foreground_species <- read_lines(fg_species_file) %>% str_trim()
retained_species <- read_lines(retained_species_file) %>% str_trim()

# ============================= #
#         OUTPUT SETUP         #
# ============================= #
tree_output_dir <- file.path("9_1_LabelledPhylogenies_Pruned", output_prefix)
fasta_input_dir <- "8_2_RemovedStops"
fasta_output_dir <- "8_2_RemovedStops_Pruned"

dir_create(tree_output_dir)
dir_create(fasta_output_dir)

# ============================= #
#       LABEL + PRUNE FUNC     #
# ============================= #
multiTreeLabelAndPrune <- function(tree_path, retained_sp, foreground_sp, export_path) {
  tree <- read.tree(tree_path)

  message("🌳 Processing tree: ", basename(tree_path))

  # Get tip abbreviations
  tip_species <- sapply(strsplit(tree$tip.label, "_"), `[`, 1)
  keep_tips <- tree$tip.label[tip_species %in% retained_sp]

  if (length(keep_tips) < 4) {
    message("⚠️ Skipping ", basename(tree_path), " — fewer than 4 retained tips.")
    return(NULL)
  }

  pruned_tree <- drop.tip(tree, setdiff(tree$tip.label, keep_tips))

  # Label foreground tips
  pruned_tree$tip.label <- map_chr(pruned_tree$tip.label, function(label) {
    sp_abbr <- strsplit(label, "_")[[1]][1]
    if (sp_abbr %in% foreground_sp) paste0(label, "{Foreground}") else label
  })

  # Label nodes leading to foreground
  fg_tips <- grep("\\{Foreground\\}", pruned_tree$tip.label)
  if (length(fg_tips) > 0) {
    pruned_tree$node.label <- rep("", pruned_tree$Nnode)
    ancestor_nodes <- pruned_tree$edge[pruned_tree$edge[, 2] %in% fg_tips, 1]
    pruned_tree$node.label[ancestor_nodes - length(pruned_tree$tip.label)] <- "{Foreground}"
  }

  write.tree(pruned_tree, file = export_path)
  message("✅ Tree saved to: ", export_path)
}

# ============================= #
#       FASTA PRUNE FUNC       #
# ============================= #
pruneFastaBySpecies <- function(fasta_path, retained_sp, export_path) {
  message("🧬 Processing FASTA: ", basename(fasta_path))
  fasta <- readDNAStringSet(fasta_path)

  keep_idx <- vapply(names(fasta), function(x) {
    sp_abbr <- strsplit(x, "_")[[1]][1]
    sp_abbr %in% retained_sp
  }, logical(1))

  pruned_fasta <- fasta[keep_idx]
  if (length(pruned_fasta) == 0) {
    message("⚠️ No retained sequences in: ", basename(fasta_path))
    return(NULL)
  }

  writeXStringSet(pruned_fasta, filepath = export_path)
  message("✅ FASTA saved to: ", export_path)
}


# ============================= #
#         MAIN LOOP            #
# ============================= #
# Prune + label trees
tree_files <- dir_ls(tree_dir, regexp = "\\.txt$|\\.treefile$|\\.nwk$")
walk(tree_files, function(tree_file) {
  og_name <- path_file(tree_file)
  export_name <- file.path(tree_output_dir, paste0(output_prefix, "Labelled_", og_name))
  multiTreeLabelAndPrune(tree_file, retained_species, foreground_species, export_name)
})

# Prune FASTA files
fasta_files <- dir_ls(fasta_input_dir, glob = "*.fasta")
walk(fasta_files, function(fa_file) {
  out_fa <- file.path(fasta_output_dir, path_file(fa_file))
  pruneFastaBySpecies(fa_file, retained_species, out_fa)
})

message("🎉 All trees and FASTA files processed and saved.")

5. Annotating proteins with InterProScan and Orthogroups with KinFin

As part of the process, we want to make sure that the genes under selection have meaningful biological interpretations through functional annotation and GO enrichment analysis. To achieve this, we will use InterProScan to annotate individual genes and KinFin to generate gene-level annotations, assigning functional categories to entire orthogroups. This approach aligns with the orthogroup-level focus of our analyses in aBSREL, BUSTED, and RELAX, providing insights into the functional relevance of selective pressures.

For that we run the following command:

# Example for Schistocerca only 
./scripts/RunningInterProScan_modif ./scripts/inputurls_Schistocerca_Jan2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Schistocerca_I2/5_OrthoFinder/fasta/

# Example for Polyneoptera   
./scripts/RunningInterProScan_modif ./scripts/inputurls_13polyneoptera_Jan2025.txt /scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_I2/5_OrthoFinder/fasta/
  
# we replace the version of interproscan to the most recent: interproscan-5.72-103.0
  
# we also comment out ax.set_facecolor('white')' on lines 681 and 1754 of ./kinfin/src/kinfin.py

Here is the details of ./scripts/RunningInterProScan_modif

#!/bin/bash

## SLURM Job Specifications
#SBATCH --job-name=interproscan         # Set the job name
#SBATCH --time=4-00:00:00              # Set the wall clock limit to 4 days
#SBATCH --ntasks=1                     # Request 1 task
#SBATCH --cpus-per-task=12             # Request 12 CPUs for the task
#SBATCH --mem=100G                     # Request 100GB memory
#SBATCH --output=interproscan_%j.out   # Standard output log
#SBATCH --error=interproscan_%j.err    # Standard error log

# Ensure the script receives correct arguments
if [ "$#" -ne 2 ]; then
  echo "Usage: $0 <input_file> <path_to_proteins_directory>"
  exit 1
fi

input_file=$1
proteins_dir=$2

# Load necessary modules
ml Java/11.0.2
ml WebProxy

export http_proxy=http://10.73.132.63:8080
export https_proxy=http://10.73.132.63:8080

# Main working directories
interpro_dir="./11_InterProScan/interproscan-5.72-103.0"
output_dir="$interpro_dir/out"
backup_dir="./11_InterProScan/backup"

# Create necessary directories
mkdir -p "$output_dir"
mkdir -p "$backup_dir"

# Iterate through the input file to process each species
while read -r line; do
  # Extract the species abbreviation
  name=$(echo "$line" | awk -F',' '{print $4}')
  protein_name="${name}_filteredTranscripts.fasta"
  
  echo "Processing species: $name"

  # Check if the protein file exists
  protein_path="$proteins_dir/$protein_name"
  if [ ! -f "$protein_path" ]; then
    echo "Protein file $protein_name not found in $proteins_dir. Skipping."
    continue
  fi

  # Check if the species has already been annotated
  annotated_file="$output_dir/${protein_name}.tsv"
  if [ -f "$annotated_file" ]; then
    echo "$annotated_file exists; skipping $name."
    continue
  fi

  # Backup original protein file and clean it
  cp "$protein_path" "$backup_dir/${protein_name}.bak"
  cp "$protein_path" "$interpro_dir/$protein_name"
  sed -i'.original' -e "s|\*||g" "$interpro_dir/$protein_name"
  rm "$interpro_dir/${protein_name}.original"

  # Run InterProScan
  echo "Running InterProScan for $protein_name..."
  cd "$interpro_dir"
  ./interproscan.sh -i "$protein_name" -d out/ -t p --goterms -appl Pfam -f TSV
  cd - > /dev/null

done < "$input_file"

# Combine all annotated results into a single file
cat "$output_dir"/*.tsv > "$interpro_dir/all_proteins.tsv"
echo "Annotation completed. Combined results stored in $interpro_dir/all_proteins.tsv."

# KinFin Preparation
kinfin_dir="./11_InterProScan/kinfin"
if [ ! -d "$kinfin_dir" ]; then
  echo "KinFin not installed. Please install KinFin and rerun this step."
  exit 1
fi

# Convert InterProScan results to KinFin-compatible format
echo "Preparing InterProScan results for KinFin..."
"$kinfin_dir/scripts/iprs2table.py" -i "$interpro_dir/all_proteins.tsv" --domain_sources Pfam

# Copy Orthofinder files to KinFin directory
cp 5_OrthoFinder/fasta/OrthoFinder/Results*/Orthogroups/Orthogroups.txt "$kinfin_dir/"
cp 5_OrthoFinder/fasta/OrthoFinder/Results*/WorkingDirectory/SequenceIDs.txt "$kinfin_dir/"
cp 5_OrthoFinder/fasta/OrthoFinder/Results*/WorkingDirectory/SpeciesIDs.txt "$kinfin_dir/"

# Create KinFin configuration file
echo '#IDX,TAXON' > "$kinfin_dir/config.txt"
sed 's/: /,/g' "$kinfin_dir/SpeciesIDs.txt" | cut -f 1 -d"." >> "$kinfin_dir/config.txt"

# Run KinFin functional annotation
echo "Running KinFin functional annotation..."
"$kinfin_dir/kinfin" --cluster_file "$kinfin_dir/Orthogroups.txt" \
  --config_file "$kinfin_dir/config.txt" \
  --sequence_ids_file "$kinfin_dir/SequenceIDs.txt" \
  --functional_annotation functional_annotation.txt

echo "Functional annotation completed."

6. dN/dS FitMG94

We will compute per gene and per branch the dN/dS score using HYPHY and the model FitMG94 as this will help us compute a mean dN/dS per branch. This analysis fits the Muse Gaut (+ GTR) model of codon substitution to an alignment and a tree and reports parameter estimates and trees scaled on expected number of synonymous and non synonymous substitutions per nucleotide site.

NB: Make sure to download the FitMG94.bf and place it in the TemplateBatchFiles folder for HypHy otherwise it will not work.

STEP 1. To run our analysis, we will use a loop for all orthogroups alignment and trees as follow:

#!/bin/bash

# Define paths
ALIGN_DIR="/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_2_RemovedStops"
TREE_DIR="/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Resolved_Gene_Trees"
HYPHY="/Users/maevatecher/miniconda3/envs/hyphy_env/bin/hyphy"
TEMPLATE="/Users/maevatecher/miniconda3/envs/hyphy_env/share/hyphy/TemplateBatchFiles/FitMG94.bf"

# Loop through all cleaned CDS alignments
for aln in ${ALIGN_DIR}/cleaned_OG*_cds.fasta; do
  # Get OG ID from filename
  og=$(basename "$aln" _cds.fasta | sed 's/^cleaned_//')

  # Define tree path and output file
  tree="${TREE_DIR}/${og}_tree.txt"
  out_json="${aln}.FITTER.json"

  # Check if tree exists
  if [[ -f "$tree" ]]; then
    echo "Running FitMG94 for $og..."
    $HYPHY "$TEMPLATE" \
      --alignment "$aln" \
      --tree "$tree" \
      --type local \
      --output "$out_json"
  else
    echo "Warning: Tree file not found for $og, skipping."
  fi
done

STEP 2. We parse the dN/dS scores computed with HyPhy in the *json file as follow:

#!/bin/bash

# Output file
output_file="combined_dnds_table.csv"

# Write header
echo "Orthogroup,Branch,Species,dN/dS" > "$output_file"

# Loop through each JSON file
for json in 8_2_RemovedStops/*.FITTER.json; do
  if [[ -f "$json" ]]; then
    # Get orthogroup name
    og=$(basename "$json" | sed 's/cleaned_//' | cut -d_ -f1)

    # Use jq to extract Branch, Species, and dN/dS
    jq -r --arg og "$og" '
      .["branch attributes"]["0"] 
      | to_entries 
      | map([
          $og, 
          .key, 
          (.key | capture("^(?<sp>[A-Z][a-z]{4})").sp // "internal"), 
          .value["Confidence Intervals"].MLE
        ]) 
      | .[] 
      | @csv
    ' "$json" >> "$output_file"
  fi
done

STEP 3. Plotting the dN/dS per Species

library(ggplot2)
library(dplyr)


Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

library(readr)

# Load data
dnds_data <- read_csv("/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/HYPHY_selection/combined_dnds_table.csv") %>% rename(orthogroup = Orthogroup)

Rows: 309886 Columns: 4

── Column specification ────────────────────────────────────────────────────────
Delimiter: ","
chr (3): Orthogroup, Branch, Species
dbl (1): dN/dS

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

relax_data <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_annotated.csv")

Rows: 5339 Columns: 53
── Column specification ────────────────────────────────────────────────────────
Delimiter: ","
chr (11): orthogroup, selection_status, file, input_file, selection_type, As...
dbl (39): pval_foreground, padj_foreground, pval_background, padj_background...
lgl  (3): suspect_result.x, suspect_result.y, significant

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# Load the list of orthogroups (one per line)
single_copy_OGs <- read_lines("/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt")

# Extract PSG
psg_df <- relax_data %>%
  select(orthogroup, selection_status, suspect_result.x) %>%
  filter(suspect_result.x == "FALSE")  %>%
  mutate(PSG = selection_status %in% c("Foreground only", "Both foreground and background")) %>%
  distinct()

# Merge and clean
dnds_data <- dnds_data %>%
  left_join(psg_df, by = "orthogroup") %>%
  mutate(
    PSG = ifelse(is.na(PSG), FALSE, PSG),
    Species = factor(Species, levels = c("Lmigr", "Sgreg", "Scanc", "Spice", "Samer", "Sscub", "Snite")),
    `dN/dS` = as.numeric(`dN/dS`),
    locust_group = ifelse(Species %in% c("Lmigr", "Sgreg", "Scanc", "Spice"), "Locust", "Other")
  ) %>%
  filter(!is.na(`dN/dS`), !is.na(Species), `dN/dS` <= 1) %>%
  filter(orthogroup %in% single_copy_OGs)

# PLOT
ggplot(dnds_data, aes(x = Species, y = `dN/dS`, fill = locust_group)) +
  geom_violin(
    aes(group = Species),
    scale = "area",
    trim = FALSE,
    adjust = 1.2,
    alpha = 0.7,
    color = "black"
  ) +
#  geom_jitter(
#    aes(color = PSG),
#    width = 0.15,
#    size = 0.8,
#    alpha = 0.5
#  ) +
  # Add red mean lines
  stat_summary(
    fun = mean,
    geom = "crossbar",
    width = 0.3,
    color = "red",
    fatten = 3
  ) +
  facet_wrap(
    ~ PSG,
    labeller = labeller(PSG = c(`TRUE` = "PSG Orthogroups", `FALSE` = "Non-PSG Orthogroups"))
  ) +
  scale_fill_manual(values = c("Locust" = "gray60", "Other" = "white")) +
  scale_color_manual(values = c("TRUE" = "#D95F02", "FALSE" = "gray80")) +
  coord_cartesian(ylim = c(0, 1)) +
  labs(
    title = "Raincloud Violin Plot of dN/dS per Species",
    subtitle = "Faceted by PSG Status; Locusts shaded in gray; Red line = mean",
    x = "Species",
    y = "dN/dS"
  ) +
  theme_minimal(base_size = 14) +
  theme(
    strip.text = element_text(face = "bold"),
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

Warning: No shared levels found between `names(values)` of the manual scale and the
data's colour values.

ggplot(dnds_data, aes(x = Species, y = `dN/dS`, fill = PSG)) +
  geom_violin(
    aes(group = interaction(Species, PSG)),
    position = position_dodge(width = 0.6),  # smaller = less gap
    scale = "width",
    width = 0.7,                             # narrower violins
    trim = FALSE,
    adjust = 1.2,
    alpha = 0.7,
    color = "black"
  ) +
  stat_summary(
    aes(group = PSG),
    fun = mean,
    geom = "crossbar",
    width = 0.2,
    color = "red",
    fatten = 3,
    position = position_dodge(width = 0.6)
  ) +
  scale_fill_manual(values = c(`TRUE` = "#D95F02", `FALSE` = "gray70"),
                    labels = c(`TRUE` = "PSG", `FALSE` = "Non-PSG")) +
  coord_cartesian(ylim = c(0, 1)) +
  labs(
    title = "dN/dS per Species",
    subtitle = "PSGs vs Non-PSGs side by side",
    x = "Species",
    y = "dN/dS",
    fill = "Category"
  ) +
  theme_minimal(base_size = 14) +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

7. aBSREL

Running the analysis

We will perform aBSREL analysis using both unlabeled and labelled phylogeny.


# For Polyneoptera
# For unlabelled phylogeny
sbatch ./scripts/RunaBSREL_May2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Resolved_Gene_Trees/ \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt 

# For labelled phylogeny
sbatch ./scripts/RunaBSREL_labeled_May2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt 

# For labelled phylogeny PRUNED
sbatch ./scripts/RunaBSREL_labeled_June2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies_Pruned/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt

Unlabeled

Parsing the json files

For parsing the results, you just do:

srun --ntasks 1 --cpus-per-task 16 --mem 50G --time 05:00:00 --pty bash
ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1
export R_LIBS=$SCRATCH/R_LIBS_USER/

Rscript ./scripts/Parsing_aBSRELresulsr_unlabel_June2025.R

Below is the detail of the parsing aBSREL script ./scripts/Parsing_aBSRELresulsr_unlabel_June2025.R:

# ===========================
# A. LOAD LIBRARIES
# ===========================
library(jsonlite)
library(dplyr)


Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

library(stringr)
library(readr)
library(tibble)

# ===========================
# B. DEFINE PATHS
# ===========================
input_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/9_2_ABSRELResults_unlabeled/"
output_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedABSRELResults_unlabeled/"
orthotable_path <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera/Results_I2_iqtree/Orthogroups/Orthogroups_CladeAssignment_WithCopyStatus_cleaned.csv"

# ===========================
# C. INITIALIZE
# ===========================
files <- list.files(path = input_dir, pattern = "\\.json$", full.names = TRUE)
file_all <- file.path(output_dir, "parsed_absrel_full.csv")
file_sig <- file.path(output_dir, "parsed_absrel_significant_full.csv")

all_results <- data.frame()
sig_results <- data.frame()

# ===========================
# D. PARSE JSON FILES
# ===========================

for (file in files) {
  try({
    json <- fromJSON(file)
    orthogroup <- str_extract(basename(file), "OG[0-9]+")

    # Check required fields exist
    if (!"branch attributes" %in% names(json)) next
    if (!"0" %in% names(json$`branch attributes`)) next

    branches <- json$`branch attributes`$`0`

    # Pull alignment stats once per file
    aln_length <- json$input$`number of sites`
    seq_count  <- json$input$`number of sequences`

    for (branch_name in names(branches)) {
      entry <- branches[[branch_name]]
      rates <- entry$`Rate Distributions`
      n <- if (!is.null(rates)) nrow(as.data.frame(rates)) else 0

      row <- data.frame(
        Orthogroup = orthogroup,
        Branch = branch_name,
        Species = substr(branch_name, 1, 5),
        Baseline_MG94xREV = entry$`Baseline MG94xREV`,
        Baseline_omega = entry$`Baseline MG94xREV omega ratio`,
        Full_adaptive_model = entry$`Full adaptive model`,
        Full_adaptive_model_nonsyn = entry$`Full adaptive model (non-synonymous subs/site)`,
        Full_adaptive_model_syn = entry$`Full adaptive model (synonymous subs/site)`,
        LRT = entry$`LRT`,
        Nucleotide_GTR = entry$`Nucleotide GTR`,
        Rate_classes = entry$`Rate classes`,
        Uncorrected_P = entry$`Uncorrected P-value`,
        Corrected_P = entry$`Corrected P-value`,
        aln_length = aln_length,
        seq_count = seq_count,
        Omega1 = NA, Percent1 = NA,
        Omega2 = NA, Percent2 = NA,
        Omega3 = NA, Percent3 = NA,
        stringsAsFactors = FALSE
      )

      # Add omega/proportion values
      if (!is.null(rates)) {
        df <- as.data.frame(rates)
        for (i in 1:min(n, 3)) {
          row[[paste0("Omega", i)]] <- df[i, 1]
          row[[paste0("Percent", i)]] <- df[i, 2]
        }
      }

      all_results <- bind_rows(all_results, row)

      if (!is.null(row$Corrected_P) && !is.na(row$Corrected_P) && row$Corrected_P <= 0.05) {
        sig_results <- bind_rows(sig_results, row)
      }
    }
  }, silent = TRUE)
}


# ===========================
# E. FLAG SUSPECT BRANCHES
# ===========================
all_results <- all_results %>%
  mutate(
    Baseline_omega = as.numeric(Baseline_omega),
    aln_length = as.numeric(aln_length),
    seq_count = as.numeric(seq_count),
    Suspect_Result = is.na(Baseline_omega) | Baseline_omega > 100 | aln_length < 100 | seq_count < 4
  )

sig_results <- sig_results %>%
  mutate(
    Baseline_omega = as.numeric(Baseline_omega),
    aln_length = as.numeric(aln_length),
    seq_count = as.numeric(seq_count),
    Suspect_Result = is.na(Baseline_omega) | Baseline_omega > 100 | aln_length < 100 | seq_count < 4
  )

# ===========================
# F. WRITE OUTPUT
# ===========================
if (!dir.exists(output_dir)) dir.create(output_dir, recursive = TRUE)
write_csv(all_results, file_all)
write_csv(sig_results, file_sig)
cat("✅ Full parsing complete.\n")

✅ Full parsing complete.

# ===========================
# G. CREATE SUMMARY TABLE
# ===========================
createSummaryTable <- function(results_df) {
  results_df %>%
    mutate(across(starts_with("Omega"), as.numeric),
           Corrected_P = as.numeric(Corrected_P),
           Significant = Corrected_P <= 0.05) %>%
    rowwise() %>%
    mutate(
      Mean_omega = mean(c_across(starts_with("Omega")), na.rm = TRUE),
      Max_omega = max(c_across(starts_with("Omega")), na.rm = TRUE)
    ) %>%
    ungroup() %>%
    group_by(Orthogroup) %>%
    summarise(
      Total_Branches = n(),
      Significant_Branches = sum(Significant),
      Proportion_Significant = Significant_Branches / Total_Branches,
      Suspect_Branches = sum(Suspect_Result),
      Positive_Species = paste0(Species[Significant], collapse = ";"),
      Mean_omega = mean(Mean_omega, na.rm = TRUE),
      Max_omega = max(Max_omega, na.rm = TRUE),
      .groups = "drop"
    )
}

summary_table <- createSummaryTable(all_results)
write_csv(summary_table, file.path(output_dir, "absrel_summary_table.csv"))

# ===========================
# H. ANNOTATE WITH ORTHO INFO
# ===========================
orthologtable <- read_csv(orthotable_path)

Rows: 20027 Columns: 21

── Column specification ────────────────────────────────────────────────────────
Delimiter: ","
chr  (7): Orthogroup, Assigned_Clade, Orthogroup_Type, SelAnalysis, SelAnaly...
dbl (14): Brsri, Csecu, Pamer, Asimp, Gbima, Glong, Lmigr, Samer, Scanc, Sgr...

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

absrel_df <- left_join(all_results, orthologtable, by = "Orthogroup") %>%
  mutate(
    Selection = as.numeric(Corrected_P) <= 0.05,
    Category = case_when(
      SelAnalysisStrict == "Included" ~ "1:1 Polyneoptera",
      SelAnalysisLocusts == "Included" ~ "1:1 Caelifera only",
      SelAnalysisMixed == "Included" ~ "1:1 Mixed",
      TRUE ~ "Other"
    )
  ) %>%
  relocate(Orthogroup, Branch, Species, Category, Selection, Corrected_P, starts_with("Omega"))

write_csv(absrel_df, file.path(output_dir, "parsed_absrel_annotated.csv"))

# ===========================
# I. SUMMARY PER SPECIES × CATEGORY
# ===========================
absrel_species_summary <- absrel_df %>%
  group_by(Species, Category) %>%
  summarise(
    Significant_Branches = sum(Selection),
    NonSignificant_Branches = sum(!Selection),
    Suspect_Branches = sum(Suspect_Result),
    Total_Branches = n(),
    .groups = "drop"
  ) %>%
  arrange(Species, Category)

knitr::kable(absrel_species_summary, caption = "Summary of aBSREL results: per species and category")

Summary of aBSREL results: per species and category
Species	Category	Significant_Branches	NonSignificant_Branches	Suspect_Branches	Total_Branches
Asimp	1:1 Mixed	31	1255	45	1286
Asimp	1:1 Polyneoptera	54	3038	63	3092
Brsri	1:1 Mixed	108	956	13	1064
Brsri	1:1 Polyneoptera	147	2945	13	3092
Csecu	1:1 Mixed	25	1177	67	1202
Csecu	1:1 Polyneoptera	67	3025	134	3092
Gbima	1:1 Mixed	131	584	66	715
Gbima	1:1 Polyneoptera	724	2368	434	3092
Glong	1:1 Mixed	62	670	71	732
Glong	1:1 Polyneoptera	167	2925	526	3092
Lmigr	1:1 Caelifera only	94	667	0	761
Lmigr	1:1 Mixed	120	1370	173	1490
Lmigr	1:1 Polyneoptera	125	2967	414	3092
Pamer	1:1 Mixed	33	1192	65	1225
Pamer	1:1 Polyneoptera	82	3010	114	3092
Samer	1:1 Caelifera only	51	710	78	761
Samer	1:1 Mixed	100	1390	115	1490
Samer	1:1 Polyneoptera	86	3006	191	3092
Scanc	1:1 Caelifera only	63	698	19	761
Scanc	1:1 Mixed	111	1379	29	1490
Scanc	1:1 Polyneoptera	107	2985	40	3092
Sgreg	1:1 Caelifera only	51	710	5	761
Sgreg	1:1 Mixed	70	1420	17	1490
Sgreg	1:1 Polyneoptera	108	2984	26	3092
Snite	1:1 Caelifera only	44	717	15	761
Snite	1:1 Mixed	130	1360	23	1490
Snite	1:1 Polyneoptera	114	2978	69	3092
Spice	1:1 Caelifera only	73	688	30	761
Spice	1:1 Mixed	122	1368	73	1490
Spice	1:1 Polyneoptera	156	2936	122	3092
Sscub	1:1 Caelifera only	41	720	52	761
Sscub	1:1 Mixed	93	1397	105	1490
Sscub	1:1 Polyneoptera	80	3012	181	3092
n10	1:1 Mixed	46	652	201	698
n10	1:1 Polyneoptera	145	2511	968	2656
n11	1:1 Polyneoptera	115	2603	176	2718
n2	1:1 Caelifera only	35	669	200	704
n2	1:1 Mixed	71	1401	216	1472
n2	1:1 Polyneoptera	171	2910	268	3081
n3	1:1 Caelifera only	23	645	136	668
n3	1:1 Mixed	72	1383	377	1455
n3	1:1 Polyneoptera	114	2942	1126	3056
n4	1:1 Caelifera only	31	610	125	641
n4	1:1 Mixed	114	1310	242	1424
n4	1:1 Polyneoptera	167	2890	395	3057
n5	1:1 Caelifera only	43	578	138	621
n5	1:1 Mixed	126	1207	203	1333
n5	1:1 Polyneoptera	111	2831	547	2942
n6	1:1 Mixed	79	1132	233	1211
n6	1:1 Polyneoptera	113	2492	322	2605
n7	1:1 Mixed	68	979	157	1047
n7	1:1 Polyneoptera	79	2204	382	2283
n8	1:1 Mixed	54	851	174	905
n8	1:1 Polyneoptera	74	2059	364	2133
n9	1:1 Mixed	77	777	235	854
n9	1:1 Polyneoptera	82	1893	446	1975

Warning: The above code chunk cached its results, but it won’t be re-run if previous chunks it depends on are updated. If you need to use caching, it is highly recommended to also set knitr::opts_chunk$set(autodep = TRUE) at the top of the file (in a chunk that is not cached). Alternatively, you can customize the option dependson for each individual chunk that is cached. Using either autodep or dependson will remove this warning. See the knitr cache options for more details.

Plotting the results

library("ggplot2")

# Load annotated aBSREL results
absrel_annotated_df <- read_csv(
  "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedABSRELResults_unlabeled/parsed_absrel_annotated.csv"
)

# Ensure Selection is logical and Category is not NA
absrel_clean <- absrel_annotated_df %>%
  filter(!is.na(Category)) %>%
  mutate(
    Selection = as.logical(Selection),
    Category = factor(Category, levels = c("1:1 Polyneoptera", "1:1 Caelifera only", "1:1 Mixed")),
    Species = factor(Species)
  )

# Create summary count table per species × category × selection status
absrel_summary_counts <- absrel_clean %>%
  group_by(Species, Category, Selection) %>%
  summarise(N = n(), .groups = "drop")

# Set factor levels for consistent fill order
absrel_summary_counts$Selection <- factor(
  absrel_summary_counts$Selection,
  levels = c(FALSE, TRUE),
  labels = c("Not Selected", "Selected")
) 


# Reorder Species factor
absrel_summary_counts <- absrel_summary_counts %>%
  filter(!Species %in% paste0("n", 1:11)) %>%  # Clean internal nodes in one line
  mutate(Species = factor(Species, levels = c("Pamer", "Csecu", "Brsri", 
     "Glong","Gbima", "Asimp", "Sscub","Samer", "Spice", "Scanc", "Snite", "Sgreg",
    "Lmigr" 
  )))


# Plot
ggplot(absrel_summary_counts, aes(x = Species, y = N, fill = Selection)) +
  geom_bar(stat = "identity", position = "stack") +
  coord_flip() +  # Flip to horizontal
  facet_wrap(~ Category, ncol = 1, scales = "free_y") +
  scale_fill_manual(values = c("Not Selected" = "#d9d9d9", "Selected" = "#1b9e77")) +
  labs(
    title = "aBSREL Selection Summary per Species and Orthogroup Category",
    x = "Species",
    y = "Number of Branches",
    fill = "Selection Status"
  ) +
  theme_minimal(base_size = 14) +
  theme(
    axis.text.y = element_text(face = "italic"),
    strip.text = element_text(face = "bold")
  )



category_colors <- c(
  "1:1 Polyneoptera" = "gold",
  "1:1 Mixed" = "black",
  "1:1 Caelifera only" = "green3",
  "Not Selected" = "gray90"
)

# Get Not Selected totals
not_selected <- absrel_summary_counts %>%
  filter(Selection == "Not Selected") %>%
  group_by(Species) %>%
  summarise(N = sum(N), Category = "Not Selected", .groups = "drop")

# Bind with selected data
combined_bar_data <- bind_rows(
  absrel_summary_counts %>% filter(Selection == "Selected"),
  not_selected
)

ggplot(combined_bar_data, 
       aes(x = Species, y = N, fill = Category)) +
  geom_bar(stat = "identity", position = "stack") +
  coord_flip() +
  scale_fill_manual(values = category_colors) +
  labs(
    title = "Selected Branches per Species",
    subtitle = "Colored by Orthogroup Category",
    x = "Species",
    y = "Number of Selected Branches",
    fill = "Orthogroup Category"
  ) +
  theme_minimal(base_size = 14) +
  theme(
    axis.text.y = element_text(face = "italic"),
    strip.text = element_text(face = "bold")
  )

ggplot(absrel_summary_counts %>% filter(Selection == "Selected"), 
       aes(x = Species, y = N, fill = Category)) +
  geom_bar(stat = "identity", position = "stack") +
  coord_flip() +
  scale_fill_manual(values = category_colors) +
  labs(
    title = "Selected Branches per Species",
    subtitle = "Colored by Orthogroup Category",
    x = "Species",
    y = "Number of Selected Branches",
    fill = "Orthogroup Category"
  ) +
  theme_minimal(base_size = 14) +
  theme(
    axis.text.y = element_text(face = "italic"),
    strip.text = element_text(face = "bold")
  )

  ### tree
library(pheatmap)
library(tidyverse)

# Filter significant only
significant_mat <- absrel_annotated_df %>%
  filter(`Corrected_P` <= 0.05) %>%
  mutate(Significant = 1) %>%
  distinct(Orthogroup, Species, Significant) %>%
  pivot_wider(names_from = Orthogroup, values_from = Significant, values_fill = 0) %>%
  column_to_rownames("Species") %>%
  as.matrix()

# Save heatmap
pdf(file.path(output_dir, "heatmap_significant_orthogroups.pdf"), width = 9, height = 6)
pheatmap(significant_mat,
         cluster_rows = TRUE,
         cluster_cols = TRUE,
         color = c("white", "darkred"),
         main = "aBSREL: Positive Selection Heatmap")
dev.off()

library(tidyverse)
library(igraph)

# Define helper function for pairwise combinations
pairwise_combinations <- function(df, col) {
  col <- rlang::ensym(col)
  df %>%
    group_by(!!col) %>%
    filter(n() > 1) %>%
    summarise(pairs = list(t(combn(unique(.[[deparse(col)]]), 2))), .groups = "drop") %>%
    unnest_wider(pairs, names_sep = "_") %>%
    rename(from = pairs_1, to = pairs_2)
}

# Build edge list from significant orthogroups with more than 1 species
#edges <- all_results %>%
#  filter(Corrected_P <= 0.05) %>%
#  distinct(Species, Orthogroup) %>%
#  pairwise_combinations(Orthogroup)

# Create graph object
#g <- graph_from_data_frame(edges, directed = FALSE)

# Optional: plot it
#pdf(file.path(output_dir, "network_positive_selection_species.pdf"), width = 8, height = 8)
#plot(
#  g,
#  vertex.size = 30,
#  vertex.label.cex = 0.9,
#  vertex.label.color = "black",
#  vertex.color = "skyblue",
#  edge.width = ,
#  main = "Network of Species Co-selected in aBSREL Orthogroups"
#)
#dev.off()


# ===========================
# Load Libraries
# ===========================
library(ape)
library(viridis)
library(tidyverse)

# ===========================
# File Paths
# ===========================
input_results <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedABSRELResults_unlabeled/parsed_absrel_full.csv"
tree_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Species_Tree/SpeciesTree_rooted_node_labels.txt"
output_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedABSRELResults_unlabeled/tree_colored_by_omega3_allbranches_FINAL.pdf"
trusted_orthogroups <- readLines("/Users/maevatecher/Desktop/Polyneoptera_FINAL/trusted_ogs_v2.txt")

# ===========================
# Load Data
# ===========================
all_results <- read_csv(input_results, show_col_types = FALSE)

filtered_results <- all_results %>%
  filter(Suspect_Result == "FALSE") %>%
  filter(Orthogroup %in% trusted_orthogroups)
#  filter(Orthogroup %in% trusted_orthogroups & !is.na(Baseline_omega))


tree <- read.tree(tree_file)

desired_order <- c(
  "Pamer_filteredTranscripts", "Csecu_filteredTranscripts",
  "Sgreg_filteredTranscripts", "Snite_filteredTranscripts", "Scanc_filteredTranscripts",
  "Spice_filteredTranscripts", "Sscub_filteredTranscripts", "Samer_filteredTranscripts",
  "Lmigr_filteredTranscripts", "Asimp_filteredTranscripts", "Glong_filteredTranscripts",
  "Gbima_filteredTranscripts", "Brsri_filteredTranscripts"
)

# Ensure all desired tips are in the tree
stopifnot(all(desired_order %in% tree$tip.label))

# Ladderize and reorder the tip labels by desired order
tree <- ladderize(tree, right = FALSE)

# Reorder tree$tip.label visually via `plot.phylo()` call
tip_order <- match(tree$tip.label, desired_order)



# ===========================
# Harmonize Labels
# ===========================
# Create node label lookup: node index → cleaned label
node_labels <- c(tree$tip.label, tree$node.label)
names(node_labels) <- 1:(length(tree$tip.label) + tree$Nnode)

# Remove "_filteredTranscripts..." and lowercase
node_to_label <- tolower(gsub("_filteredTranscripts.*", "", node_labels))
names(node_to_label) <- names(node_labels)

# Clean Branch names from all_results
omega_df <- filtered_results %>%
  filter(!is.na(Omega1)) %>%
  mutate(label = tolower(gsub("_filteredTranscripts.*", "", Branch))) %>%
  group_by(label) %>%
  summarize(mean_omega = mean(as.numeric(Omega3), na.rm = TRUE)) %>%
  ungroup()

omega_df <- omega_df %>% filter(label != "n2")  %>%
    filter(label != "n3")  %>%
    filter(label != "n4")  %>%
    filter(label != "n5")  %>%
    filter(label != "n6")  %>%
    filter(label != "n7")  %>%
    filter(label != "n8") %>% 
    filter(label != "n9")  %>%
    filter(label != "n10")  %>%
    filter(label != "n11") %>%
    filter(label != "asimp") %>% 
    filter(label != "brsri")  %>%
    filter(label != "csecu")  %>%
    filter(label != "gbima") %>%
    filter(label != "glong") %>% 
    filter(label != "pamer")

# ===========================
# Map omega3 to Tree Branches
# ===========================
omega_vals <- rep(NA, nrow(tree$edge))

for (i in seq_len(nrow(tree$edge))) {
  child_node <- tree$edge[i, 2]
  label <- node_to_label[as.character(child_node)]

  if (!is.na(label) && label %in% omega_df$label) {
    omega_vals[i] <- omega_df$mean_omega[omega_df$label == label]
  }
}

# ===========================
# Generate Colors
# ===========================
color_scale <- viridis(100)

if (all(is.na(omega_vals))) {
  warning("No omega values matched any tree node labels.")
  edge_colors <- rep("grey", length(omega_vals))
} else {
  omega_vals <- as.numeric(omega_vals)
  cut_omega <- cut(omega_vals, breaks = 100)
  edge_colors <- color_scale[as.numeric(cut_omega)]
  edge_colors[is.na(edge_colors)] <- "grey"
}

# ===========================
# Plot Tree with Edge Colors
# ===========================
pdf(output_file, width = 9, height = 7)
par(mar = c(5, 4, 4, 6))  # leave space for legend

plot(tree,
     edge.color = edge_colors,
     edge.width = 4,
     cex = 1,
     main = "Mean Omega3 per Branch (Tips + Internal)",
     show.tip.label = TRUE,
     use.edge.length = FALSE,
     tip.order = tip_order)


# Continuous legend (manual)
zlim_vals <- range(omega_vals, na.rm = TRUE)
legend_vals <- pretty(zlim_vals, n = 5)
legend_colors <- color_scale[as.numeric(cut(legend_vals, breaks = 100))]


legend("topright",
       legend = round(legend_vals, 2),
       fill = legend_colors,
       border = NA,
       title = "omega")

dev.off()

message("✅ Tree plot saved to: ", output_file)

Annotating OGs under selection

Here we are working with Orthogroups number under selection per branch, and we want to have a functional enrichment of the genes associated per species to allow comparison. First we need to extract the positively selected genes/orthogroups for each species:

library(dplyr)
library(readr)

# Load aBSREL results
absrel_df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedABSRELResults_unlabeled/parsed_absrel_annotated.csv")

# Filter PSGs: significant, non-suspect
psg_ogs <- absrel_df %>%
  filter(Selection == TRUE, Suspect_Result == FALSE) %>%
  dplyr::select(Species, Orthogroup)


ortho_dir <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera"
input_file <- file.path(ortho_dir, "Results_I2_iqtree/Orthogroups_genesproteinbiotype_13species_annotated_May2025.csv")
ortho_map <- read.csv(input_file, header = TRUE, stringsAsFactors = FALSE)
head(ortho_map)

  Orthogroup                 SpeciesID     protein_id       GeneID
1  OG0000000 Asimp_filteredTranscripts XP_067003642.2 LOC136874043
2  OG0000000 Asimp_filteredTranscripts XP_067004661.1 LOC136874869
3  OG0000000 Asimp_filteredTranscripts XP_067015293.1 LOC136886419
4  OG0000000 Asimp_filteredTranscripts XP_067015651.2 LOC136886746
5  OG0000000 Asimp_filteredTranscripts XP_068085770.1 LOC137496902
6  OG0000000 Asimp_filteredTranscripts XP_068087037.1 LOC137503369
                                   Description Species       GeneType
1            farnesol dehydrogenase isoform X1   Asimp protein-coding
2 dehydrogenase/reductase SDR family member 11   Asimp protein-coding
3                       farnesol dehydrogenase   Asimp protein-coding
4                       farnesol dehydrogenase   Asimp protein-coding
5                  farnesol dehydrogenase-like   Asimp protein-coding
6                  farnesol dehydrogenase-like   Asimp protein-coding
    Accession     Begin       End Orthogroup_Type
1 NC_090269.1 316521124 316596183       MultiCopy
2 NC_090269.1 316408775 316497937       MultiCopy
3 NC_090279.1 165240845 165292312       MultiCopy
4 NC_090279.1 164532314 164617967       MultiCopy
5 NC_090275.1  60074551  60101839       MultiCopy
6 NC_090279.1 164618824 164719067       MultiCopy

# Join PSG orthogroups with gene IDs, species-aware
psg_genes <- psg_ogs %>%
  inner_join(ortho_map, by = c("Orthogroup","Species")) %>%
  dplyr::select(Species, Orthogroup, GeneID)

Then we use the same function we used for DEGs GO terms and KEGG enrichment:

# === Paths and Constants ===
workDir     <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data"
GODir       <- file.path(workDir, "list", "GO_Annotations")
RefDir      <- file.path(workDir, "RefSeq")
enrichDir   <- file.path(workDir, "HYPHY_selection/functional_pathways/aBSREL")
selListDir <- file.path(workDir, "HYPHY_selection/ParsedABSRELResults_unlabeled")

species_list <- c("gregaria", "cancellata", "piceifrons", "americana", "cubense", "nitens")

# === Load Required Libraries ===
library(data.table)
library(dplyr)
library(readr)
library(clusterProfiler)
library(GO.db)
library(rtracklayer)
library(DesertLocustR)  # Local installation

gff_map <- c(
  gregaria   = "GCF_023897955.1_iqSchGreg1.2_genomic.gff",
  cancellata = "GCF_023864275.1_iqSchCanc2.1_genomic.gff",
  piceifrons = "GCF_021461385.2_iqSchPice1.1_genomic.gff",
  americana  = "GCF_021461395.2_iqSchAmer2.1_genomic.gff",
  cubense    = "GCF_023864345.2_iqSchSeri2.2_genomic.gff",
  nitens     = "GCF_023898315.1_iqSchNite1.1_genomic.gff"
)

annot_map <- c(
  gregaria   = "EggNog_Arthropoda_one2one.emapper.annotations",
  cancellata = "GCF_023864275.1_iqSchCanc2.1_Arthopoda_one2one.emapper.annotations",
  piceifrons = "GCF_021461385.2_iqSchPice1.1_Arthopoda_one2one.emapper.annotations",
  americana  = "GCF_021461395.2_iqSchAmer2.1_Arthopoda_one2one.emapper.annotations",
  cubense    = "GCF_023864345.2_iqSchSeri2.2_Arthopoda_one2one.emapper.annotations",
  nitens     = "GCF_023898315.1_iqSchNite1.1_Arthopoda_one2one.emapper.annotations"
)

# GO enrichment
enrich_GO <- function(dge_genes.df, term2gene, term2name, pval, qval){
  genes <- rownames(dge_genes.df)
  enricher(genes, TERM2GENE = term2gene, TERM2NAME = term2name, pvalueCutoff = pval,
           pAdjustMethod = "BH", qvalueCutoff = qval)
}

# KEGG preparation
assign_kegg_ids <- function(sig_genes.df){
  if (is.vector(sig_genes.df)) {
    sig_genes.df <- data.frame(X.query = sig_genes.df, stringsAsFactors = FALSE)
  } else {
    sig_genes.df$X.query <- rownames(sig_genes.df)
  }
  
  dge_with_kegg_ids <- left_join(sig_genes.df, kegg_final, by = "X.query")
  dge_with_kegg_ids$KEGG_ko[grepl("^K", dge_with_kegg_ids$KEGG_ko)]
}


# KEGG enrichment
enrich_KEGG <- function(dge_genes.df, pval_cutoff = 0.05, qval_cutoff = 0.05) {
  gene_with_kegg_ids <- assign_kegg_ids(dge_genes.df)
  enrichKEGG(
    gene         = gene_with_kegg_ids,
    organism     = "ko",
    pvalueCutoff = pval_cutoff,
    qvalueCutoff = qval_cutoff,
    pAdjustMethod = "BH"
  )
}


run_GO_enrichment_selected <- function(
    gene_list,
    go_table,
    term2name,
    species,
    suffix,
    ontology,
    output_dir,
    show_n = 30,
    top_n = 30
) {
  if (length(gene_list) == 0) return(NULL)
  
  if (!dir.exists(output_dir)) {
    dir.create(output_dir, recursive = TRUE)
  }
  # Make sure column names are correct for clusterProfiler::enricher()
  go_table_fixed <- go_table[, 1:2]
  colnames(go_table_fixed) <- c("go_id", "gene_id")
  
  term2name_fixed <- term2name[, 1:2]
  colnames(term2name_fixed) <- c("go_id", "name")
  
  # Run enrichment
  go_result <- enricher(
    gene = gene_list,
    TERM2GENE = go_table_fixed,
    TERM2NAME = term2name_fixed,
    pvalueCutoff = 0.05,
    qvalueCutoff = 0.05
  )
  
  if (!is.null(go_result) &&
      inherits(go_result, "enrichResult") &&
      nrow(go_result@result) > 0 &&
      sum(!is.na(go_result@result$Description)) > 0) {
    
    # Save dotplot
    try({
      pdf(file = file.path(output_dir, paste0("GO_", ontology, "_dotplot_", species, "_", suffix, ".pdf")),
          width = 8, height = 6)
      print(dotplot(go_result, showCategory = min(show_n, nrow(go_result@result))) +
              ggtitle(paste(ontology, suffix)))
      dev.off()
    }, silent = TRUE)
    
    # Export top terms with log10(p)
    species_enrich_ready <- go_result@result[, c("ID", "p.adjust")]
    species_enrich_ready$logp <- -log10(species_enrich_ready$p.adjust)
    species_enrich_ready <- species_enrich_ready[order(-species_enrich_ready$logp), ]
    species_enrich_ready <- head(species_enrich_ready, n = top_n)[, c("ID", "logp")]
    
    write.table(species_enrich_ready,
                file = file.path(output_dir, paste0("enrich_", ontology, "_GOs_", species, "_", suffix, ".txt")),
                sep = "\t", quote = FALSE, row.names = FALSE, col.names = FALSE)
    
    # Also export the full table if needed
    write.csv(go_result@result,
              file = file.path(output_dir, paste0("GO_enrichment_full_", ontology, "_", species, "_", suffix, ".csv")),
              row.names = FALSE)
    
  } else {
    message(paste0("⚠️ No GO enrichment result to plot/export for ", species, " - ", suffix))
  }
}



run_KEGG_enrichment_selected <- function(gene_list, species, suffix, output_dir,
                                         show_n = 40, top_n = 40) {
  if (length(gene_list) == 0) return(NULL)
  
  kegg_result <- enrich_KEGG(gene_list, pval_cutoff = 0.05, qval_cutoff = 0.05)
  
  if (!is.null(kegg_result) && inherits(kegg_result, "enrichResult") &&
      nrow(kegg_result@result) > 0) {
    try({
      pdf(file = file.path(output_dir, paste0("KEGG_dotplot_", species, "_", suffix, ".pdf")),
          width = 8, height = 6)
      print(dotplot(kegg_result, showCategory = min(show_n, nrow(kegg_result@result))) +
              ggtitle(paste("KEGG", suffix)))
      dev.off()
    }, silent = TRUE)
    
    # Full result
    write.csv(kegg_result@result,
              file = file.path(output_dir, paste0("KEGG_enrichment_", species, "_", suffix, ".csv")),
              row.names = FALSE)
    
    # Top KEGG terms
    species_enrich_kegg <- kegg_result@result[, c("ID", "p.adjust")]
    species_enrich_kegg$logp <- -log10(species_enrich_kegg$p.adjust)
    species_enrich_kegg <- species_enrich_kegg[order(-species_enrich_kegg$logp), ][1:min(nrow(species_enrich_kegg), top_n), ]
    species_enrich_kegg <- species_enrich_kegg[, c("ID", "logp")]
    
    write.table(species_enrich_kegg,
                file = file.path(output_dir, paste0("enrich_KEGG_", species, "_", suffix, ".txt")),
                sep = "\t", quote = FALSE, row.names = FALSE, col.names = FALSE)
  } else {
    message(paste("⚠️ No KEGG enrichment result to plot/export for", species, "-", suffix))
  }
}

GO_terms_list      <- list()
ontologies_list    <- list()
term2name_list     <- list()
kegg_final_list    <- list()

# Mapping external species names to internal codes in ortho_map
species_translate <- c(
  gregaria   = "Sgreg",
  cancellata = "Scanc",
  piceifrons = "Spice",
  americana  = "Samer",  # double-check this is correct
  cubense    = "Sscub",
  nitens     = "Snite"
)

for (sp in species_list) {
  message("Preparing annotations for ", sp)
  sp_code <- species_translate[sp]
  eggnog_path <- file.path(GODir, annot_map[[sp]])
  gff_path    <- file.path(RefDir,  gff_map[[sp]])
  
  output_dir <- file.path(enrichDir, sp)
  dir.create(output_dir, recursive = TRUE, showWarnings = FALSE)
  
  eggnog_annots <- read.delim(eggnog_path, sep = "\t", skip = 4)
  eggnog_annots <- eggnog_annots[1:(nrow(eggnog_annots) - 3), ]
  
  gff.df <- as.data.frame(import(gff_path))
  protein_2_gene <- unique(gff.df[c("Name", "gene")])
  protein_2_gene_df <- subset(protein_2_gene, grepl("^XP", protein_2_gene$Name))
  
  eggnog_annots$Name <- eggnog_annots$X.query
  eggnog_annots <- left_join(eggnog_annots, protein_2_gene_df, by = "Name")
  eggnog_annots$X.query <- eggnog_annots$gene
  
  # GO
  GO_terms <- data.table(eggnog_annots[, c("X.query", "GOs")])
  GO_terms <- GO_terms[, .(GOs = unlist(strsplit(GOs, ","))), by = X.query]
  term2name <- GO_terms[, .(GOs, X.query)]
  term2name$Names <- mapIds(GO.db, keys = term2name$GOs, column = "TERM", keytype = "GOID")
  term2name$Ontology <- mapIds(GO.db, keys = term2name$GOs, column = "ONTOLOGY", keytype = "GOID")
  term2name <- as.data.frame(term2name)
  
  go_bp <- term2name[term2name$Ontology == "BP", c("GOs", "X.query")]
  go_mf <- term2name[term2name$Ontology == "MF", c("GOs", "X.query")]
  go_cc <- term2name[term2name$Ontology == "CC", c("GOs", "X.query")]
  term2name_filtered <- term2name[!is.na(term2name$Names), c("GOs", "Names")]
  ontologies <- list(BP = go_bp, MF = go_mf, CC = go_cc)
  
  # KEGG
  KO_terms <- data.table(eggnog_annots[, c("X.query", "KEGG_ko")])
  KO_terms$KEGG_ko <- gsub("ko:", "", as.character(KO_terms$KEGG_ko))
  KO_terms <- KO_terms[, .(KEGG_ko = unlist(strsplit(KEGG_ko, ","))), by = X.query]
  kegg_final <- KO_terms[, .(KEGG_ko, X.query)]
  
  # Store per species
  GO_terms_list[[sp]]     <- GO_terms
  ontologies_list[[sp]]   <- ontologies
  term2name_list[[sp]]    <- term2name_filtered
  kegg_final_list[[sp]]   <- kegg_final
}

We run the loop using the the list of selected genes extracted in step 1:

# ===== Set up parameters =====
species_list <- c("gregaria", "cancellata", "piceifrons", "americana", "cubense", "nitens")
suffix <- "aBSREL"

# Mapping external species names to internal codes in ortho_map
species_translate <- c(
  gregaria   = "Sgreg",
  cancellata = "Scanc",
  piceifrons = "Spice",
  americana  = "Samer",  # double-check this is correct
  cubense    = "Sscub",
  nitens     = "Snite"
)

# ===== Loop through each species =====
go_results_all <- list()
kegg_results_all <- list()

# initialize diagnostic log
diagnostic_log <- data.frame(
  Species = character(),
  PSG_genes = integer(),
  GO_overlap = integer(),
  KEGG_overlap = integer(),
  stringsAsFactors = FALSE
)

for (sp in species_list) {
  message("Processing ", sp)
  sp_code <- species_translate[sp]
  output_dir <- file.path(enrichDir, sp)
  dir.create(output_dir, recursive = TRUE, showWarnings = FALSE)
  
  # 1. Extract PSG GeneIDs for this species
  species_genes <- psg_genes %>%
    filter(Species == sp_code) %>%
    pull(GeneID) %>%
    unique()
  
  n_psg <- length(species_genes)
  message("→ ", n_psg, " PSG genes in ", sp)
  
  # 2. Check overlaps with GO and KEGG annotations
  go_annot   <- GO_terms_list[[sp]]$X.query
  kegg_annot <- kegg_final_list[[sp]]$X.query   # ✅ use the correct list
  
  go_overlap   <- sum(species_genes %in% go_annot)
  kegg_overlap <- sum(species_genes %in% kegg_annot)
  
  message("→ Overlap counts: GO = ", go_overlap, ", KEGG = ", kegg_overlap)
  
  if (kegg_overlap == 0) {
    message("  ⚠️ No KEGG matches for ", sp,
            ". Example missing IDs: ",
            paste(head(setdiff(species_genes, kegg_annot), 5), collapse = ", "))
  }
  
  # Add to diagnostic log
  diagnostic_log <- rbind(diagnostic_log, data.frame(
    Species = sp,
    PSG_genes = n_psg,
    GO_overlap = go_overlap,
    KEGG_overlap = kegg_overlap
  ))
  
  # 3. Run GO enrichment (by ontology)
  selected_genes_go <- species_genes[species_genes %in% go_annot]
  go_by_onto <- list()
  for (onto in names(ontologies_list[[sp]])) {
    go_by_onto[[onto]] <- run_GO_enrichment_selected(
      gene_list  = selected_genes_go,
      go_table   = ontologies_list[[sp]][[onto]],
      term2name  = term2name_list[[sp]],
      species    = sp,
      suffix     = suffix,
      ontology   = onto,
      output_dir = output_dir
    )
  }
  go_results_all[[sp]] <- go_by_onto
  
  # 4. Run KEGG enrichment
  selected_genes_kegg <- species_genes[species_genes %in% kegg_annot]
  kegg_final <<- kegg_final_list[[sp]]  # required by assign_kegg_ids()
  kegg_results_all[[sp]] <- run_KEGG_enrichment_selected(
    gene_list  = selected_genes_kegg,
    species    = sp,
    suffix     = suffix,
    output_dir = output_dir
  )
}

# save diagnostic log
write.csv(diagnostic_log, file.path(enrichDir, "diagnostic_overlap_log.csv"), row.names = FALSE)
print(diagnostic_log)

     Species PSG_genes GO_overlap KEGG_overlap
1   gregaria       229        197          197
2 cancellata       280        252          252
3 piceifrons       347        321          321
4  americana       222        197          197
5    cubense       206        188          188
6     nitens       285        256          256

8. BUSTED

We will perform BUSTED analysis using both unlabeled and labelled phylogeny.

The unlabeled gene tree phylogeny will allow for an exploratory analysis, testing all Polyneoptera for positive selection. While this approach provides a broad overview, it comes at the cost of reduced statistical power due to multiple testing.
In contrast, the labelled gene tree phylogeny will focus specifically on migratory locust species compared to all other species or to non-migratory grasshoppers, enabling us to associate traits with selective pressures.

Note: The new version of OrthoFinder makes a list of SingleCopy Orthologues by adding a N0:H before the orthogroup name. N0.HOG0000086 N0.HOG0000090 N0.HOG0000212 N0.HOG0000220 N0.HOG0000478 N0.HOG0000479 N0.HOG0000503 N0.HOG0000505

So we need to clean that up before running our files using the command

sed 's/^N0\.HOG/OG/' Orthogroups_SingleCopyOrthologues.txt > Orthogroups_SingleCopyOrthologues_renamed.txt

Running the analysis

We will perform BUSTED analysis using both unlabeled and labelled gene tree phylogeny. The unlabeled phylogeny will allow for a gene-wide exploratory analysis treating the entire tree of Polyneoptera as foreground.

# For Polyneoptera

# For unlabelled phylogeny
sbatch scripts/RunBUSTED_May2025.sh  \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Resolved_Gene_Trees/ \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt 

# For labelled phylogeny
sbatch ./scripts/RunBUSTED_labeled_May2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt 

# For labelled phylogeny PRUNED
sbatch ./scripts/RunBUSTED_labeled_June2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies_Pruned/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt

If we want to run R interactively on the cluster:

srun --ntasks 1 --cpus-per-task 16 --mem 50G --time 05:00:00 --pty bash
ml GCC/13.2.0  OpenMPI/4.1.6 R_tamu/4.4.1 
ml WebProxy
export R_LIBS=$SCRATCH/R_LIBS_USER/
  
  Rscript ./scripts/Parsing_BUSTEDresulsr_unlabel_June2025.R

Unlabelled

Parsing the json files

To parse all the details from the BUSTED by testing all branches to see if we have selection pressures ./scripts/Parsing_BUSTEDresulsr_unlabel_June2025.R:

library(jsonlite)
library(tidyverse)

── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
✔ forcats   1.0.0     ✔ purrr     1.0.4
✔ ggplot2   3.5.2     ✔ tidyr     1.3.1
✔ lubridate 1.9.4     
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter()  masks stats::filter()
✖ purrr::flatten() masks jsonlite::flatten()
✖ dplyr::lag()     masks stats::lag()
ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

library(hexbin)

# ============ SETTINGS ============
input_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_3_BustedResults"
single_copy_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt"
output_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_unlabeled"
dir.create(output_dir, showWarnings = FALSE, recursive = TRUE)

# ============ JSON PARSER ============
parse_busted <- function(file) {
  tryCatch({
    busted <- jsonlite::fromJSON(file)
    
    og <- stringr::str_extract(basename(file), "^OG[0-9]+")
    busted_input_file <- busted[["input"]][["file name"]]
    busted_pval <- as.numeric(busted[["test results"]][["p-value"]])
    
    # Corrected metadata fields
    aln_length <- busted[["input"]][["number of sites"]]
    seq_count  <- busted[["input"]][["number of sequences"]]
    
    # Rate model info: safely extract from 'Test'
    rate_info <- busted[["fits"]][["Unconstrained model"]][["Rate Distributions"]][["Test"]]
    
    omega_vals <- sapply(rate_info, function(x) as.numeric(x[["omega"]]))
    prop_vals  <- sapply(rate_info, function(x) as.numeric(x[["proportion"]]))
    
    # Optional: if missing, use NA
    omega3 <- ifelse(length(omega_vals) >= 3, omega_vals[3], NA)
    prop3  <- ifelse(length(prop_vals) >= 3, prop_vals[3], NA)
    
    # Flag potential overfitting
    suspect <- is.na(omega3) || omega3 > 1000 || prop3 < 0.001 || aln_length < 100 || seq_count < 4
    
    tibble::tibble(
      file = file,
      input_file = busted_input_file,
      orthogroup = og,
      seq_count = seq_count,
      aln_length = aln_length,
      omega1 = omega_vals[1],
      prop1  = prop_vals[1],
      omega2 = omega_vals[2],
      prop2  = prop_vals[2],
      omega3 = omega3,
      prop_sites = prop3,
      pval = busted_pval,
      padj = p.adjust(busted_pval, method = "BH"),
      significant = p.adjust(busted_pval, method = "BH") < 0.05,
      suspect_result = suspect
    )
  }, error = function(e) {
    message("⚠️ Error parsing: ", file, " -> ", e$message)
    return(NULL)
  })
}


# ============ Parse All JSON Files ============
json_files <- list.files(input_dir, pattern = "\\.json$", full.names = TRUE)
parsed <- map_dfr(json_files, parse_busted)

# ============ Save All Results ============
write_csv(parsed, file.path(output_dir, "BUSTED_results_all.csv"))
write_csv(filter(parsed, significant), file.path(output_dir, "BUSTED_results_significant.csv"))

# ============ Optional: Filter for Single-Copy Orthogroups ============
if (file.exists(single_copy_file)) {
  sc_ogs <- read_lines(single_copy_file) %>% str_trim()
  parsed_sc <- parsed %>% filter(orthogroup %in% sc_ogs)
  
  write_csv(parsed_sc, file.path(output_dir, "BUSTED_results_singlecopy.csv"))
  write_csv(filter(parsed_sc, significant), file.path(output_dir, "BUSTED_results_singlecopy_significant.csv"))
}

# ============ Quick Summary ============
message("✅ Parsed: ", nrow(parsed), " orthogroups")

✅ Parsed: 5343 orthogroups

message("🧬 Positive selection (FDR < 0.05): ", sum(parsed$significant))

🧬 Positive selection (FDR < 0.05): 2183

library(ggplot2)

# Create hexbin plot for significant results
p <- ggplot(filter(parsed, significant), aes(x = prop_sites, y = omega3)) +
  geom_hex(bins = 40) +
  scale_fill_gradient(trans = "log10", low = "#ccf0ed", high = "#014a44") +
  scale_x_log10() +
  scale_y_log10() +
  labs(
    title = "Selection Landscape for Positively Selected Genes",
    x = "Proportion of Sites Under Selection (log10)",
    y = "Strength of Selection (omega, log10)",
    fill = "Number of Genes"
  ) +
  theme_bw()

ggsave(filename = file.path(output_dir, "busted_hexbin_plot.pdf"), plot = p, width = 7, height = 6)

p2 <- ggplot(parsed, aes(x = omega3, y = -log10(padj), color = significant)) +
  geom_point(alpha = 0.8) +
  scale_color_manual(values = c("FALSE" = "grey60", "TRUE" = "red")) +
  labs(
    x = "Strength of Selection (omega3)",
    y = expression(-log[10]~"(FDR-adjusted p-value)"),
    color = "Significant"
  ) +
  theme_minimal()

ggsave(file.path(output_dir, "busted_volcano_plot.pdf"), p2, width = 7, height = 6)

p3 <- parsed %>%
  filter(significant) %>%
  arrange(padj) %>%
  slice_head(n = 20) %>%
  ggplot(aes(x = reorder(orthogroup, -padj), y = -log10(padj))) +
  geom_col(fill = "steelblue") +
  coord_flip() +
  labs(
    x = "Orthogroup",
    y = expression(-log[10]~"(FDR-adjusted p-value)"),
    title = "Top 20 Positively Selected Orthogroups"
  ) +
  theme_classic()

ggsave(file.path(output_dir, "busted_top20_barplot.pdf"), p3, width = 8, height = 6)

Extracting the selected genes

We run BUSTED analysis on a total of 5,347 single copy orthogroups for which:

3,094 orthogroups with 1:1 orthologs for all species (SelecAnalysisStrict = Included).
763 orthogroups with 1:1 orthologs for Caelifera species (SelAnalysisLocusts = Included).
1,490 orthogroups with mixed 1:1 orthologs with all Caelifera species (SelAnalysisMixed = Included).

We will show the results by category.

library(ggplot2)
library(dplyr)
library(readr)
library(ggnewscale)

ortho_dir <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera"
input_file <- file.path(ortho_dir, "Results_I2_iqtree/Orthogroups/Orthogroups_CladeAssignment_WithCopyStatus_cleaned.csv")
orthologtable <- read.csv(input_file, header = TRUE, stringsAsFactors = FALSE)

hyphy_dir <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/HYPHY_selection"
input_file2 <- file.path(hyphy_dir, "ParsedBUSTEDResults_unlabeled/BUSTED_results_all.csv")
bustedtable <- read.csv(input_file2, header = TRUE, stringsAsFactors = FALSE) %>%
  select(-input_file, -file)

busted_df <- left_join(orthologtable, bustedtable, by = c("Orthogroup" = "orthogroup"))

# Save as CSV
workDir <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data"
output_file <- file.path(workDir, "HYPHY_selection/ParsedBUSTEDResults_unlabeled/busted_compiled.csv")
write.csv(busted_df, output_file, row.names = FALSE)

busted_SingleStrict <- busted_df %>%
  filter(SelAnalysisStrict == "Included")

busted_locust <- busted_df %>%
  filter(SelAnalysisLocusts == "Included")

busted_mixed <- busted_df %>%
  filter(SelAnalysisMixed == "Included")

library(dplyr)
library(tibble)

summary_table <- tibble(
  Category = c("1:1 Polyneoptera", "1:1 Caelifera only", "1:1 Mixed"),
  Total = c(
    sum(busted_df$SelAnalysisStrict == "Included", na.rm = TRUE),
    sum(busted_df$SelAnalysisLocusts == "Included", na.rm = TRUE),
    sum(busted_df$SelAnalysisMixed == "Included", na.rm = TRUE)
  ),
  Significant = c(
    sum(busted_df$SelAnalysisStrict == "Included" & busted_df$padj < 0.05, na.rm = TRUE),
    sum(busted_df$SelAnalysisLocusts == "Included" & busted_df$padj < 0.05, na.rm = TRUE),
    sum(busted_df$SelAnalysisMixed == "Included" & busted_df$padj < 0.05, na.rm = TRUE)
  ),
  Suspect = c(
    sum(busted_df$SelAnalysisStrict == "Included" & busted_df$padj < 0.05 & busted_df$suspect_result == TRUE, na.rm = TRUE),
    sum(busted_df$SelAnalysisLocusts == "Included" & busted_df$padj < 0.05 & busted_df$suspect_result == TRUE, na.rm = TRUE),
    sum(busted_df$SelAnalysisMixed == "Included" & busted_df$padj < 0.05 & busted_df$suspect_result == TRUE, na.rm = TRUE)
  )
)%>%
  mutate(True_Selected = Significant - Suspect)

knitr::kable(summary_table, caption = "Summary of BUSTED results per orthogroup category")

Summary of BUSTED results per orthogroup category
Category	Total	Significant	Suspect	True_Selected
1:1 Polyneoptera	3094	1414	280	1134
1:1 Caelifera only	763	210	59	151
1:1 Mixed	1490	559	110	449

A total of 2,183 orthogroups showed signature of selection but only 1,734 showed omega3 values that were not suspect (due to model over fitting, short alignment, low divergence).

Below is the selection landscape for all orthogroups with corrected (BH) p-value < 0.05.

# Filter for significant genes
parsed <- busted_df %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3))  # <- ensure both axes are numeric

# Separate the suspect results
suspect_points <- parsed %>%
  filter(suspect_result == TRUE)

# Base: All significant data
base_data <- parsed %>% filter(suspect_result == FALSE)
suspect_data <- parsed %>% filter(suspect_result == TRUE)

p <- ggplot() +
  geom_hex(data = base_data, aes(x = prop_sites, y = omega3), bins = 40) +
  scale_fill_gradient(trans = "log10", low = "#ccf0ed", high = "#014a44") +
  new_scale_fill() +  # Needed from ggh4x or ggnewscale to add a second fill scale
  
  geom_hex(data = suspect_data, aes(x = prop_sites, y = omega3), bins = 40, inherit.aes = FALSE) +
  scale_fill_gradient(trans = "log10", low = "mistyrose", high = "red", name = "Suspect Count") +
  
  scale_x_log10() +
  scale_y_log10() +
  labs(
    title = "Selection Landscape: Suspect Results in Red Hexes",
    x = "Proportion of Sites Under Selection (log10)",
    y = "Strength of Selection (omega, log10)"
  ) +
  theme_bw()

p

Version	Author	Date
a2d2955	Maeva TECHER	2025-07-01

Below we show the hex bin graphs for only the 1:1 Polyneoptera and 1:1 Caelifera selection landscapes.

# Filter for significant genes
parsed_polyneoptera <- busted_SingleStrict %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3)) %>% # <- ensure both axes are numeric
  filter(suspect_result == FALSE) 

# Plot
p <- ggplot(parsed_polyneoptera, aes(x = prop_sites, y = omega3)) +
  geom_hex(bins = 40) +
  scale_fill_gradient(trans = "log10", low = "#ccf0ed", high = "#014a44") +
  scale_x_log10() +
  scale_y_log10() +
  labs(
    title = "Selection Landscape for Positively Selected Genes (1:1 Polyneoptera)",
    x = "Proportion of Sites Under Selection (log10)",
    y = "Strength of Selection (omega, log10)",
    fill = "Number of Orthogroups"
  ) +
  theme_bw()

p

Version	Author	Date
a2d2955	Maeva TECHER	2025-07-01

# Filter for significant genes
parsed_locust <- busted_locust %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3)) %>% # <- ensure both axes are numeric
  filter(suspect_result == FALSE) 

# We make a hexbin graph only for genes that are locust only

ggplot(parsed_locust, aes(x = prop_sites, y = omega3)) +
  geom_hex(bins = 40) +
  scale_fill_gradient(trans = "log10", low = "#e6f2ff", high = "#084594") +
  scale_x_log10() +
  scale_y_log10() +
  labs(
    title = "Selection on Strict Single-Copy Genes (1:1 Caelifera only)",
    x = "Proportion of Sites Under Selection (log10)",
    y = "Strength of Selection (omega, log10)",
    fill = "Number of Orthogroups"
  ) +
  theme_bw()

Version	Author	Date
a2d2955	Maeva TECHER	2025-07-01

To explore more clearly which orthogroups are showing high selective pressure, we made an interactive version of the hex bin plot below:

library(plotly)

# Prepare your data (already filtered for single-copy, etc.)
plot_data <- parsed_locust %>%
  mutate(
    log_omega3 = log10(omega3),
    log_prop_sites = log10(prop_sites)
  )


p <- ggplot(parsed_locust, aes(x = log10(prop_sites), y = log10(omega3))) +
  geom_hex(bins = 40, aes(fill = ..count..)) +
  geom_point(aes(text = Orthogroup), alpha = 0.1, color = "black") +  # invisible overlay for tooltip
  scale_fill_viridis_c(trans = "log10") +
  labs(
    x = "log10(Proportion of Sites Under Selection)",
    y = "log10(Omega3)",
    fill = "Orthogroup Count",
    title = "Interactive Hexbin with Orthogroup Hover (1:1 genes Caelifera only)"
  ) +
  theme_minimal()

ggplotly(p, tooltip = "text")

Annotating OGs under selection

Now we will enrich the pathways for which the genes under selection were found:

ortho_dir <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data/orthofinder/Polyneoptera"
input_file <- file.path(ortho_dir, "Results_I2_iqtree/Orthogroups_genesproteinbiotype_13species_annotated_May2025.csv")
ortho_map <- read.csv(input_file, header = TRUE, stringsAsFactors = FALSE)
head(ortho_map)

  Orthogroup                 SpeciesID     protein_id       GeneID
1  OG0000000 Asimp_filteredTranscripts XP_067003642.2 LOC136874043
2  OG0000000 Asimp_filteredTranscripts XP_067004661.1 LOC136874869
3  OG0000000 Asimp_filteredTranscripts XP_067015293.1 LOC136886419
4  OG0000000 Asimp_filteredTranscripts XP_067015651.2 LOC136886746
5  OG0000000 Asimp_filteredTranscripts XP_068085770.1 LOC137496902
6  OG0000000 Asimp_filteredTranscripts XP_068087037.1 LOC137503369
                                   Description Species       GeneType
1            farnesol dehydrogenase isoform X1   Asimp protein-coding
2 dehydrogenase/reductase SDR family member 11   Asimp protein-coding
3                       farnesol dehydrogenase   Asimp protein-coding
4                       farnesol dehydrogenase   Asimp protein-coding
5                  farnesol dehydrogenase-like   Asimp protein-coding
6                  farnesol dehydrogenase-like   Asimp protein-coding
    Accession     Begin       End Orthogroup_Type
1 NC_090269.1 316521124 316596183       MultiCopy
2 NC_090269.1 316408775 316497937       MultiCopy
3 NC_090279.1 165240845 165292312       MultiCopy
4 NC_090279.1 164532314 164617967       MultiCopy
5 NC_090275.1  60074551  60101839       MultiCopy
6 NC_090279.1 164618824 164719067       MultiCopy

# Extract the orthogroup names
selected_orthogroups <- parsed_locust %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3)) %>% # <- ensure both axes are numeric
  filter(suspect_result == FALSE) %>%
  pull(Orthogroup) %>% unique()

# Get corresponding GeneID
selected_genes <- ortho_map %>%
  filter(Orthogroup %in% selected_orthogroups) %>%
  pull(GeneID) %>% unique()

We can use the same pipeline and functions as in our section 3: GO enrichment for DEGs.

# === Paths and Constants ===
workDir     <- "/Users/maevatecher/Documents/GitHub/locust-comparative-genomics/data"
GODir       <- file.path(workDir, "list", "GO_Annotations")
RefDir      <- file.path(workDir, "RefSeq")
enrichDir   <- file.path(workDir, "HYPHY_selection/functional_pathways/BUSTED_unlabeled")
selListDir <- file.path(workDir, "HYPHY_selection/ParsedBUSTEDResults_unlabeled")

species_list <- c("gregaria", "cancellata", "piceifrons", "americana", "cubense", "nitens")

# === Load Required Libraries ===
library(data.table)
library(dplyr)
library(readr)
library(clusterProfiler)
library(GO.db)
library(rtracklayer)
library(DesertLocustR)  # Local installation

gff_map <- c(
  gregaria   = "GCF_023897955.1_iqSchGreg1.2_genomic.gff",
  cancellata = "GCF_023864275.1_iqSchCanc2.1_genomic.gff",
  piceifrons = "GCF_021461385.2_iqSchPice1.1_genomic.gff",
  americana  = "GCF_021461395.2_iqSchAmer2.1_genomic.gff",
  cubense    = "GCF_023864345.2_iqSchSeri2.2_genomic.gff",
  nitens     = "GCF_023898315.1_iqSchNite1.1_genomic.gff"
)

annot_map <- c(
  gregaria   = "EggNog_Arthropoda_one2one.emapper.annotations",
  cancellata = "GCF_023864275.1_iqSchCanc2.1_Arthopoda_one2one.emapper.annotations",
  piceifrons = "GCF_021461385.2_iqSchPice1.1_Arthopoda_one2one.emapper.annotations",
  americana  = "GCF_021461395.2_iqSchAmer2.1_Arthopoda_one2one.emapper.annotations",
  cubense    = "GCF_023864345.2_iqSchSeri2.2_Arthopoda_one2one.emapper.annotations",
  nitens     = "GCF_023898315.1_iqSchNite1.1_Arthopoda_one2one.emapper.annotations"
)

# GO enrichment
enrich_GO <- function(dge_genes.df, term2gene, term2name, pval, qval){
  genes <- rownames(dge_genes.df)
  enricher(genes, TERM2GENE = term2gene, TERM2NAME = term2name, pvalueCutoff = pval,
           pAdjustMethod = "BH", qvalueCutoff = qval)
}

# KEGG preparation
assign_kegg_ids <- function(sig_genes.df){
  if (is.vector(sig_genes.df)) {
    sig_genes.df <- data.frame(X.query = sig_genes.df, stringsAsFactors = FALSE)
  } else {
    sig_genes.df$X.query <- rownames(sig_genes.df)
  }
  
  dge_with_kegg_ids <- left_join(sig_genes.df, kegg_final, by = "X.query")
  dge_with_kegg_ids$KEGG_ko[grepl("^K", dge_with_kegg_ids$KEGG_ko)]
}


# KEGG enrichment
enrich_KEGG <- function(dge_genes.df, pval_cutoff = 0.05, qval_cutoff = 0.05) {
  gene_with_kegg_ids <- assign_kegg_ids(dge_genes.df)
  enrichKEGG(
    gene         = gene_with_kegg_ids,
    organism     = "ko",
    pvalueCutoff = pval_cutoff,
    qvalueCutoff = qval_cutoff,
    pAdjustMethod = "BH"
  )
}


run_GO_enrichment_selected <- function(
    gene_list,
    go_table,
    term2name,
    species,
    suffix,
    ontology,
    output_dir,
    show_n = 30,
    top_n = 30
) {
  if (length(gene_list) == 0) return(NULL)
  
  if (!dir.exists(output_dir)) {
    dir.create(output_dir, recursive = TRUE)
  }
  # Make sure column names are correct for clusterProfiler::enricher()
  go_table_fixed <- go_table[, 1:2]
  colnames(go_table_fixed) <- c("go_id", "gene_id")
  
  term2name_fixed <- term2name[, 1:2]
  colnames(term2name_fixed) <- c("go_id", "name")
  
  # Run enrichment
  go_result <- enricher(
    gene = gene_list,
    TERM2GENE = go_table_fixed,
    TERM2NAME = term2name_fixed,
    pvalueCutoff = 0.05,
    qvalueCutoff = 0.05
  )
  
  if (!is.null(go_result) &&
      inherits(go_result, "enrichResult") &&
      nrow(go_result@result) > 0 &&
      sum(!is.na(go_result@result$Description)) > 0) {
    
    # Save dotplot
    try({
      pdf(file = file.path(output_dir, paste0("GO_", ontology, "_dotplot_", species, "_", suffix, ".pdf")),
          width = 8, height = 6)
      print(dotplot(go_result, showCategory = min(show_n, nrow(go_result@result))) +
              ggtitle(paste(ontology, suffix)))
      dev.off()
    }, silent = TRUE)
    
    # Export top terms with log10(p)
    species_enrich_ready <- go_result@result[, c("ID", "p.adjust")]
    species_enrich_ready$logp <- -log10(species_enrich_ready$p.adjust)
    species_enrich_ready <- species_enrich_ready[order(-species_enrich_ready$logp), ]
    species_enrich_ready <- head(species_enrich_ready, n = top_n)[, c("ID", "logp")]
    
    write.table(species_enrich_ready,
                file = file.path(output_dir, paste0("enrich_", ontology, "_GOs_", species, "_", suffix, ".txt")),
                sep = "\t", quote = FALSE, row.names = FALSE, col.names = FALSE)
    
    # Also export the full table if needed
    write.csv(go_result@result,
              file = file.path(output_dir, paste0("GO_enrichment_full_", ontology, "_", species, "_", suffix, ".csv")),
              row.names = FALSE)
    
  } else {
    message(paste0("⚠️ No GO enrichment result to plot/export for ", species, " - ", suffix))
  }
}



run_KEGG_enrichment_selected <- function(gene_list, species, suffix, output_dir,
                                         show_n = 40, top_n = 40) {
  if (length(gene_list) == 0) return(NULL)
  
  kegg_result <- enrich_KEGG(gene_list, pval_cutoff = 0.05, qval_cutoff = 0.05)
  
  if (!is.null(kegg_result) && inherits(kegg_result, "enrichResult") &&
      nrow(kegg_result@result) > 0) {
    try({
      pdf(file = file.path(output_dir, paste0("KEGG_dotplot_", species, "_", suffix, ".pdf")),
          width = 8, height = 6)
      print(dotplot(kegg_result, showCategory = min(show_n, nrow(kegg_result@result))) +
              ggtitle(paste("KEGG", suffix)))
      dev.off()
    }, silent = TRUE)
    
    # Full result
    write.csv(kegg_result@result,
              file = file.path(output_dir, paste0("KEGG_enrichment_", species, "_", suffix, ".csv")),
              row.names = FALSE)
    
    # Top KEGG terms
    species_enrich_kegg <- kegg_result@result[, c("ID", "p.adjust")]
    species_enrich_kegg$logp <- -log10(species_enrich_kegg$p.adjust)
    species_enrich_kegg <- species_enrich_kegg[order(-species_enrich_kegg$logp), ][1:min(nrow(species_enrich_kegg), top_n), ]
    species_enrich_kegg <- species_enrich_kegg[, c("ID", "logp")]
    
    write.table(species_enrich_kegg,
                file = file.path(output_dir, paste0("enrich_KEGG_", species, "_", suffix, ".txt")),
                sep = "\t", quote = FALSE, row.names = FALSE, col.names = FALSE)
  } else {
    message(paste("⚠️ No KEGG enrichment result to plot/export for", species, "-", suffix))
  }
}

GO_terms_list      <- list()
ontologies_list    <- list()
term2name_list     <- list()
kegg_final_list    <- list()

# Mapping external species names to internal codes in ortho_map
species_translate <- c(
  gregaria   = "Sgreg",
  cancellata = "Scanc",
  piceifrons = "Spice",
  americana  = "Samer",  # double-check this is correct
  cubense    = "Sscub",
  nitens     = "Snite"
)

for (sp in species_list) {
  message("Preparing annotations for ", sp)
  sp_code <- species_translate[sp]
  eggnog_path <- file.path(GODir, annot_map[[sp]])
  gff_path    <- file.path(RefDir,  gff_map[[sp]])
  
  output_dir <- file.path(enrichDir, sp)
  dir.create(output_dir, recursive = TRUE, showWarnings = FALSE)
  
  eggnog_annots <- read.delim(eggnog_path, sep = "\t", skip = 4)
  eggnog_annots <- eggnog_annots[1:(nrow(eggnog_annots) - 3), ]
  
  gff.df <- as.data.frame(import(gff_path))
  protein_2_gene <- unique(gff.df[c("Name", "gene")])
  protein_2_gene_df <- subset(protein_2_gene, grepl("^XP", protein_2_gene$Name))
  
  eggnog_annots$Name <- eggnog_annots$X.query
  eggnog_annots <- left_join(eggnog_annots, protein_2_gene_df, by = "Name")
  eggnog_annots$X.query <- eggnog_annots$gene
  
  # GO
  GO_terms <- data.table(eggnog_annots[, c("X.query", "GOs")])
  GO_terms <- GO_terms[, .(GOs = unlist(strsplit(GOs, ","))), by = X.query]
  term2name <- GO_terms[, .(GOs, X.query)]
  term2name$Names <- mapIds(GO.db, keys = term2name$GOs, column = "TERM", keytype = "GOID")
  term2name$Ontology <- mapIds(GO.db, keys = term2name$GOs, column = "ONTOLOGY", keytype = "GOID")
  term2name <- as.data.frame(term2name)
  
  go_bp <- term2name[term2name$Ontology == "BP", c("GOs", "X.query")]
  go_mf <- term2name[term2name$Ontology == "MF", c("GOs", "X.query")]
  go_cc <- term2name[term2name$Ontology == "CC", c("GOs", "X.query")]
  term2name_filtered <- term2name[!is.na(term2name$Names), c("GOs", "Names")]
  ontologies <- list(BP = go_bp, MF = go_mf, CC = go_cc)
  
  # KEGG
  KO_terms <- data.table(eggnog_annots[, c("X.query", "KEGG_ko")])
  KO_terms$KEGG_ko <- gsub("ko:", "", KO_terms$KEGG_ko)
  KO_terms <- KO_terms[, .(KEGG_ko = unlist(strsplit(KEGG_ko, ","))), by = X.query]
  kegg_final <- KO_terms[, .(KEGG_ko, X.query)]
  
  # Store per species
  GO_terms_list[[sp]]     <- GO_terms
  ontologies_list[[sp]]   <- ontologies
  term2name_list[[sp]]    <- term2name_filtered
  kegg_final_list[[sp]]   <- kegg_final
}

For the Polyneoptera genes: we enrich only for S. gregaria as own model since the genes are orthologs.

# ===== Prepare list of selected genes from orthogroups ====
selected_orthogroups <- parsed_polyneoptera %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3)) %>% # <- ensure both axes are numeric
  filter(suspect_result == FALSE) %>%
  pull(Orthogroup) %>% unique()

selected_genes <- ortho_map %>%
  filter(Orthogroup %in% selected_orthogroups) %>%
  pull(GeneID) %>%
  unique()

# ===== Set up parameters =====
#species_list <- c("gregaria", "cancellata", "piceifrons", "americana", "cubense", "nitens")
species_list <- c("gregaria")
suffix <- "BUSTED_POLYNEOPTERA"

# Mapping external species names to internal codes in ortho_map
species_translate <- c(
  gregaria   = "Sgreg",
  cancellata = "Scanc",
  piceifrons = "Spice",
  americana  = "Samer",  # double-check this is correct
  cubense    = "Sscub",
  nitens     = "Snite"
)

go_results_all <- list()
kegg_results_all <- list()

# ===== Loop through each species =====
for (sp in species_list) {
  message("Processing ", sp)
  sp_code <- species_translate[sp]
  output_dir <- file.path(enrichDir, sp)
  
  species_genes <- ortho_map %>%
    filter(Orthogroup %in% selected_orthogroups, Species == sp_code) %>%
    pull(GeneID) %>%
    unique()
  
  # Get species-specific GO terms
  selected_genes_annot <- species_genes[species_genes %in% GO_terms_list[[sp]]$X.query]
  message("→ ", length(selected_genes_annot), " genes for GO enrichment in ", sp)
  
  # GO enrichment
  go_by_onto <- list()
  for (onto in names(ontologies_list[[sp]])) {
    go_by_onto[[onto]] <- run_GO_enrichment_selected(
      gene_list  = selected_genes_annot,
      go_table   = ontologies_list[[sp]][[onto]],
      term2name  = term2name_list[[sp]],
      species    = sp,
      suffix     = suffix,
      ontology   = onto,
      output_dir = output_dir
    )
  }
  go_results_all[[sp]] <- go_by_onto
  
  # KEGG enrichment
  kegg_final <<- kegg_final_list[[sp]]  # used inside assign_kegg_ids
  kegg_results_all[[sp]] <- run_KEGG_enrichment_selected(
    gene_list  = selected_genes_annot,
    species    = sp,
    suffix     = suffix,
    output_dir = output_dir
  )
}

Now we check the genes under selection only in Schistocerca clade, only for S. gregaria as own model since the genes are orthologs.

# ===== Prepare list of selected genes from orthogroups =====
selected_orthogroups <- parsed_locust %>%
  filter(!is.na(padj), padj < 0.05) %>%
  filter(!is.na(prop_sites), !is.na(omega3)) %>% # <- ensure both axes are numeric
  filter(suspect_result == FALSE) %>%
  pull(Orthogroup) %>% unique()

selected_genes <- ortho_map %>%
  filter(Orthogroup %in% selected_orthogroups) %>%
  pull(GeneID) %>%
  unique()

# ===== Set up parameters =====
#species_list <- c("gregaria", "cancellata", "piceifrons", "americana", "cubense", "nitens")
species_list <- c("gregaria")
suffix <- "BUSTED_CAELIFERA"

# Mapping external species names to internal codes in ortho_map
species_translate <- c(
  gregaria   = "Sgreg",
  cancellata = "Scanc",
  piceifrons = "Spice",
  americana  = "Samer",  # double-check this is correct
  cubense    = "Sscub",
  nitens     = "Snite"
)

go_results_all <- list()
kegg_results_all <- list()

# ===== Loop through each species =====
for (sp in species_list) {
  message("Processing ", sp)
  sp_code <- species_translate[sp]
  output_dir <- file.path(enrichDir, sp)
  
  species_genes <- ortho_map %>%
    filter(Orthogroup %in% selected_orthogroups, Species == sp_code) %>%
    pull(GeneID) %>%
    unique()
  
  # Get species-specific GO terms
  selected_genes_annot <- species_genes[species_genes %in% GO_terms_list[[sp]]$X.query]
  message("→ ", length(selected_genes_annot), " genes for GO enrichment in ", sp)
  
  # GO enrichment
  go_by_onto <- list()
  for (onto in names(ontologies_list[[sp]])) {
    go_by_onto[[onto]] <- run_GO_enrichment_selected(
      gene_list  = selected_genes_annot,
      go_table   = ontologies_list[[sp]][[onto]],
      term2name  = term2name_list[[sp]],
      species    = sp,
      suffix     = suffix,
      ontology   = onto,
      output_dir = output_dir
    )
  }
  go_results_all[[sp]] <- go_by_onto
  
  # KEGG enrichment
  kegg_final <<- kegg_final_list[[sp]]  # used inside assign_kegg_ids
  kegg_results_all[[sp]] <- run_KEGG_enrichment_selected(
    gene_list  = selected_genes_annot,
    species    = sp,
    suffix     = suffix,
    output_dir = output_dir
  )
}

Labelled

Parsing the json files

To parse the results from the *json files from the BUSTED-PH with migratory locusts as foreground branches we run this ./scripts/Parsing_BUSTEDresulsr_labelled_June2025.R:

#!/usr/bin/env Rscript

# ============================= #
#         LOAD LIBRARIES       #
# ============================= #
suppressPackageStartupMessages({
  library(tidyverse)
  library(jsonlite)
  library(fs)
})

# ============================= #
#         PARSE ONE FILE       #
# ============================= #
parse_busted <- function(file) {
  tryCatch({
    busted <- jsonlite::fromJSON(file)
    
    og <- stringr::str_extract(basename(file), "^OG[0-9]+")
    busted_input_file <- busted[["input"]][["file name"]]
    busted_pval <- as.numeric(busted[["test results"]][["p-value"]])
    
    # Metadata
    aln_length <- busted[["input"]][["number of sites"]]
    seq_count  <- busted[["input"]][["number of sequences"]]
    
    # Rate model info (Unconstrained model → Test)
    rate_info <- busted[["fits"]][["Unconstrained model"]][["Rate Distributions"]][["Test"]]
    
    omega_vals <- sapply(rate_info, function(x) as.numeric(x[["omega"]]))
    prop_vals  <- sapply(rate_info, function(x) as.numeric(x[["proportion"]]))
    
    omega3 <- ifelse(length(omega_vals) >= 3, omega_vals[3], NA)
    prop3  <- ifelse(length(prop_vals) >= 3, prop_vals[3], NA)
    
    suspect <- is.na(omega3) || omega3 > 1000 || prop3 < 0.001 || aln_length < 100 || seq_count < 4
    
    tibble(
      file = basename(file),
      input_file = busted_input_file,
      orthogroup = og,
      seq_count = seq_count,
      aln_length = aln_length,
      omega1 = omega_vals[1],
      prop1  = prop_vals[1],
      omega2 = omega_vals[2],
      prop2  = prop_vals[2],
      omega3 = omega3,
      prop_sites = prop3,
      pval = busted_pval,
      padj = p.adjust(busted_pval, method = "BH"),
      significant = p.adjust(busted_pval, method = "BH") < 0.05,
      suspect_result = suspect
    )
  }, error = function(e) {
    message("⚠️ Error parsing: ", file, " → ", e$message)
    return(NULL)
  })
}

# ============================= #
#          RUN SCRIPT          #
# ============================= #

# Define your directories
foreground_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_4_BustedResults_labeled/Locusts/foreground/"
background_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_4_BustedResults_labeled/Locusts/background/"
output_dir     <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled"

# Create output folder
dir_create(output_dir)

# Find all files
fg_files <- dir_ls(foreground_dir, glob = "*.json")
bg_files <- dir_ls(background_dir, glob = "*.json")

# Parse all
parsed_fg <- purrr::map_dfr(fg_files, parse_busted) %>% mutate(dataset = "foreground")
parsed_bg <- purrr::map_dfr(bg_files, parse_busted) %>% mutate(dataset = "background")

# Merge
results_all <- bind_rows(parsed_fg, parsed_bg)

# Save
write_csv(results_all, file.path(output_dir, "busted_results_labeled_full.csv"))

message("✅ Parsed labeled BUSTED results for ", nrow(results_all), " genes.")

library(tidyverse)

# Load the parsed results
busted_df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled/busted_results_labeled_full.csv")

# Pivot all needed columns
busted_summary <- busted_df %>%
  dplyr::select(
    orthogroup, dataset,
    significant, suspect_result,
    seq_count, aln_length,
    omega1, omega2, omega3,
    prop1, prop2, prop_sites,
    pval, padj
  ) %>%
  distinct() %>%
  pivot_wider(
    names_from = dataset,
    values_from = c(
      significant, suspect_result,
      seq_count, aln_length,
      omega1, omega2, omega3,
      prop1, prop2, prop_sites,
      pval, padj
    ),
    names_glue = "{.value}_{dataset}",
    values_fill = NA
  ) %>%
  mutate(
    selection_status = case_when(
      significant_foreground & !significant_background ~ "Foreground only",
      !significant_foreground & significant_background ~ "Background only",
      significant_foreground & significant_background ~ "Both foreground and background",
      TRUE ~ "No selection"
    ),
    suspect_result = suspect_result_foreground | suspect_result_background
  ) %>%
  dplyr::select(
    orthogroup, selection_status, suspect_result,
    pval_foreground, padj_foreground,
    pval_background, padj_background,
    starts_with("seq_count"), starts_with("aln_length"),
    starts_with("omega"), starts_with("prop")
  )

# View or write to file
print(busted_summary)

write_csv(
  busted_summary,
  "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled/busted_orthogroup_summary.csv"
)

Plotting fg vs bg

# ========== Load Libraries ==========
library(tidyverse)

# ========== Load Data ==========
busted_df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled/busted_results_labeled_full.csv")

# ========== Data Preparation ==========

# Pivot to wide format
plot_df <- busted_df %>%
  dplyr::select(orthogroup, dataset, omega3, significant, suspect_result) %>%
  pivot_wider(
    names_from = dataset,
    values_from = c(omega3, significant, suspect_result),
    names_sep = "_"
  ) %>%
  # Filter out rows with missing omega3 or suspect results
  filter(
    !is.na(omega3_foreground),
    !is.na(omega3_background),
    suspect_result_foreground == FALSE,
    suspect_result_background == FALSE
  ) %>%
  # Log-transform omega3
  mutate(
    log_omega3_fore = log10(omega3_foreground + 1e-3),
    log_omega3_back = log10(omega3_background + 1e-3),
    color_status = case_when(
      significant_foreground ~ "Positive Selection",
      TRUE ~ "Not Significant"
    )
  )

# ========== Plot ==========
plot <- ggplot(plot_df, aes(x = log_omega3_fore, y = log_omega3_back)) +
  geom_point(aes(color = color_status), size = 3, alpha = 0.8) +
  scale_color_manual(values = c("Positive Selection" = "#9B59B6", "Not Significant" = "gray80")) +
  labs(
    x = expression(log[10]~omega[3]~"(foreground branches)"),
    y = expression(log[10]~omega[3]~"(background branches)"),
    color = "Selection"
  ) +
  coord_cartesian(xlim = c(-2, 4), ylim = c(-2, 4)) +
  theme_minimal(base_size = 14) +
  theme(legend.position = "top")

# ========== Export ==========
ggsave("bustedPH_logomega3_scatter_nosuspect.pdf", plot, width = 8, height = 6)

# Preview
print(plot)

Labelled Pruned

Parsing the json files

#!/usr/bin/env Rscript

# ============================= #
#         LOAD LIBRARIES       #
# ============================= #
suppressPackageStartupMessages({
  library(tidyverse)
  library(jsonlite)
  library(fs)
})

# ============================= #
#         PARSE ONE FILE       #
# ============================= #
parse_busted <- function(file) {
  tryCatch({
    busted <- jsonlite::fromJSON(file)
    
    og <- stringr::str_extract(basename(file), "^OG[0-9]+")
    busted_input_file <- busted[["input"]][["file name"]]
    busted_pval <- as.numeric(busted[["test results"]][["p-value"]])
    
    # Metadata
    aln_length <- busted[["input"]][["number of sites"]]
    seq_count  <- busted[["input"]][["number of sequences"]]
    
    # Rate model info (Unconstrained model → Test)
    rate_info <- busted[["fits"]][["Unconstrained model"]][["Rate Distributions"]][["Test"]]
    
    omega_vals <- sapply(rate_info, function(x) as.numeric(x[["omega"]]))
    prop_vals  <- sapply(rate_info, function(x) as.numeric(x[["proportion"]]))
    
    omega3 <- ifelse(length(omega_vals) >= 3, omega_vals[3], NA)
    prop3  <- ifelse(length(prop_vals) >= 3, prop_vals[3], NA)
    
    suspect <- is.na(omega3) || omega3 > 1000 || prop3 < 0.001 || aln_length < 100 || seq_count < 4
    
    tibble(
      file = basename(file),
      input_file = busted_input_file,
      orthogroup = og,
      seq_count = seq_count,
      aln_length = aln_length,
      omega1 = omega_vals[1],
      prop1  = prop_vals[1],
      omega2 = omega_vals[2],
      prop2  = prop_vals[2],
      omega3 = omega3,
      prop_sites = prop3,
      pval = busted_pval,
      padj = p.adjust(busted_pval, method = "BH"),
      significant = p.adjust(busted_pval, method = "BH") < 0.05,
      suspect_result = suspect
    )
  }, error = function(e) {
    message("⚠️ Error parsing: ", file, " → ", e$message)
    return(NULL)
  })
}

# ============================= #
#          RUN SCRIPT          #
# ============================= #

# Define your directories
foreground_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_4_BustedResults_labeled_Pruned/Locusts/foreground/"
background_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/8_4_BustedResults_labeled_Pruned/Locusts/background/"
output_dir     <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled_Pruned"

# Create output folder
dir_create(output_dir)

# Find all files
fg_files <- dir_ls(foreground_dir, glob = "*.json")
bg_files <- dir_ls(background_dir, glob = "*.json")

# Parse all
parsed_fg <- purrr::map_dfr(fg_files, parse_busted) %>% mutate(dataset = "foreground")
parsed_bg <- purrr::map_dfr(bg_files, parse_busted) %>% mutate(dataset = "background")

# Merge
results_all <- bind_rows(parsed_fg, parsed_bg)

# Save
write_csv(results_all, file.path(output_dir, "busted_results_labeled_full.csv"))

message("✅ Parsed labeled BUSTED results for ", nrow(results_all), " genes.")

library(tidyverse)

# Load the parsed results
busted_df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled_Pruned/busted_results_labeled_full.csv")

# Pivot all needed columns
busted_summary <- busted_df %>%
  dplyr::select(
    orthogroup, dataset,
    significant, suspect_result,
    seq_count, aln_length,
    omega1, omega2, omega3,
    prop1, prop2, prop_sites,
    pval, padj
  ) %>%
  distinct() %>%
  pivot_wider(
    names_from = dataset,
    values_from = c(
      significant, suspect_result,
      seq_count, aln_length,
      omega1, omega2, omega3,
      prop1, prop2, prop_sites,
      pval, padj
    ),
    names_glue = "{.value}_{dataset}",
    values_fill = NA
  ) %>%
  mutate(
    selection_status = case_when(
      significant_foreground & !significant_background ~ "Foreground only",
      !significant_foreground & significant_background ~ "Background only",
      significant_foreground & significant_background ~ "Both foreground and background",
      TRUE ~ "No selection"
    ),
    suspect_result = suspect_result_foreground | suspect_result_background
  ) %>%
  dplyr::select(
    orthogroup, selection_status, suspect_result,
    pval_foreground, padj_foreground,
    pval_background, padj_background,
    starts_with("seq_count"), starts_with("aln_length"),
    starts_with("omega"), starts_with("prop")
  )

# View or write to file
print(busted_summary)

write_csv(
  busted_summary,
  "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled_Pruned/busted_orthogroup_summary.csv"
)

Plotting fg vs bg

# ========== Load Libraries ==========
library(tidyverse)

# ========== Load Data ==========
busted_df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled_Pruned/busted_results_labeled_full.csv")

# ========== Data Preparation ==========

# Pivot to wide format
plot_df <- busted_df %>%
  dplyr::select(orthogroup, dataset, omega3, significant, suspect_result) %>%
  pivot_wider(
    names_from = dataset,
    values_from = c(omega3, significant, suspect_result),
    names_sep = "_"
  ) %>%
  # Filter out rows with missing omega3 or suspect results
  filter(
    !is.na(omega3_foreground),
    !is.na(omega3_background),
    suspect_result_foreground == FALSE,
    suspect_result_background == FALSE
  ) %>%
  # Log-transform omega3
  mutate(
    log_omega3_fore = log10(omega3_foreground + 1e-3),
    log_omega3_back = log10(omega3_background + 1e-3),
    color_status = case_when(
      significant_foreground ~ "Positive Selection",
      TRUE ~ "Not Significant"
    )
  )

# ========== Plot ==========
plot <- ggplot(plot_df, aes(x = log_omega3_fore, y = log_omega3_back)) +
  geom_point(aes(color = color_status), size = 3, alpha = 0.8) +
  scale_color_manual(values = c("Positive Selection" = "#9B59B6", "Not Significant" = "gray80")) +
  labs(
    x = expression(log[10]~omega[3]~"(foreground branches)"),
    y = expression(log[10]~omega[3]~"(background branches)"),
    color = "Selection"
  ) +
  coord_cartesian(xlim = c(-2, 4), ylim = c(-2, 4)) +
  theme_minimal(base_size = 14) +
  theme(legend.position = "top")

# ========== Export ==========
ggsave("bustedPH_logomega3_scatter_nosuspect.pdf", plot, width = 8, height = 6)

# Preview
print(plot)

9. RELAX

Running the analysis

We will perform RELAX analysis to check whether the foreground branches that have experienced selection were intensifying or relaxing:

# For Polyneoptera

# For labelled phylogeny
sbatch ./scripts/RunRELAX_labeled_May2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt 

# For labelled phylogeny PRUNED
sbatch ./scripts/RunRELAX_labeled_June2025.sh \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/9_1_LabelledPhylogenies_Pruned/Locusts \
Locusts \
/scratch/group/songlab/maeva/LocustsGenomeEvolution/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt

Labelled

Parsing the json files

For parsing the results, you just do:

# ============ SETTINGS ============
input_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/10_1_RelaxResults"
single_copy_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt"
output_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults"
dir.create(output_dir, showWarnings = FALSE, recursive = TRUE)

# ============ LIBRARIES ============
library(jsonlite)
library(tidyverse)

# ============ FUNCTIONS ============
parse_relax_json <- function(file) {
  tryCatch({
    result <- fromJSON(file)
    
    og <- stringr::str_extract(basename(file), "^OG[0-9]+")
    input_file <- result[["input"]][["file name"]]
    seq_count <- result[["input"]][["number of sequences"]]
    aln_length <- result[["input"]][["number of sites"]]
    
    test_results <- result[["test results"]]
    
    pval <- as.numeric(test_results[["p-value"]])
    k_val <- as.numeric(test_results[["relaxation or intensification parameter"]])
    
    selection_type <- case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
    
    suspect <- is.na(k_val) || k_val > 10 || k_val < 0.1 || is.na(pval) || aln_length < 100 || seq_count < 4
    
    tibble(
      file = file,
      input_file = input_file,
      orthogroup = og,
      seq_count = seq_count,
      aln_length = aln_length,
      k = k_val,
      pval = pval,
      padj = NA,  # placeholder, will be set after all parsing
      selection_type = selection_type,
      suspect_result = suspect
    )
  }, error = function(e) {
    message("⚠️ Error parsing ", file, ": ", e$message)
    return(NULL)
  })
}

relax_results <- parse_all_relax_jsons(input_dir)

if (nrow(relax_results) > 0) {
  relax_results <- relax_results %>%
    mutate(
      padj = p.adjust(pval, method = "BH"),
      significant = padj < 0.05
    )
}

parse_all_relax_jsons <- function(folder) {
  files <- list.files(folder, pattern = "\\.json$", full.names = TRUE)
  files <- files[file.info(files)$size > 0]
  
  results <- purrr::map_dfr(files, parse_relax_json)
  
  results <- results %>%
    mutate(
      padj = p.adjust(pval, method = "BH"),
      significant = padj < 0.05
    )
  
  return(results)
}

# ============ EXECUTE PARSING ============
relax_results <- parse_all_relax_jsons(input_dir)

# ============ WRITE OUTPUT ============
write_csv(relax_results, file.path(output_dir, "relax_results.csv"))
message("✅ Parsed RELAX results saved to: ", file.path(output_dir, "relax_results_csv"))

Combined results

# Load required libraries
library(readr)
library(dplyr)

# === Define file paths ===
busted_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled/busted_orthogroup_summary.csv"
relax_file  <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/relax_results.csv"

# === Read in both tables ===
busted_df <- read_csv(busted_file, show_col_types = FALSE)
relax_df  <- read_csv(relax_file, show_col_types = FALSE)

# === Left join BUSTED + RELAX results ===
combined_df <- left_join(busted_df, relax_df, by = "orthogroup")

# === Preview and save ===
head(combined_df)

# A tibble: 6 × 33
  orthogroup selection_status suspect_result.x pval_foreground padj_foreground
  <chr>      <chr>            <lgl>                      <dbl>           <dbl>
1 OG0004339  Background only  FALSE                  0.5             0.5      
2 OG0004340  Background only  FALSE                  0.0744          0.0744   
3 OG0004341  Foreground only  TRUE                   0.0000166       0.0000166
4 OG0004343  No selection     FALSE                  0.487           0.487    
5 OG0004344  No selection     TRUE                   0.5             0.5      
6 OG0004345  No selection     FALSE                  0.161           0.161    
# ℹ 28 more variables: pval_background <dbl>, padj_background <dbl>,
#   seq_count_foreground <dbl>, seq_count_background <dbl>,
#   aln_length_foreground <dbl>, aln_length_background <dbl>,
#   omega1_foreground <dbl>, omega1_background <dbl>, omega2_foreground <dbl>,
#   omega2_background <dbl>, omega3_foreground <dbl>, omega3_background <dbl>,
#   prop1_foreground <dbl>, prop1_background <dbl>, prop2_foreground <dbl>,
#   prop2_background <dbl>, prop_sites_foreground <dbl>, …

# Save combined table
write_csv(combined_df, "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_results.csv")
message("✅ Combined BUSTED + RELAX table saved.")

✅ Combined BUSTED + RELAX table saved.

Labelled pruned

Parsing the json files

For parsing the results, you just do:


# ============ SETTINGS ============
input_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/10_1_RelaxResults_Pruned"
single_copy_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/5_OrthoFinder/fasta/Results_May26_iqtree/Orthogroups/Orthogroups_SingleCopyOrthologues_selanalysiswide.txt"
output_dir <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned"
dir.create(output_dir, showWarnings = FALSE, recursive = TRUE)

# ============ LIBRARIES ============
library(jsonlite)
library(tidyverse)

# ============ FUNCTIONS ============
parse_relax_json <- function(file) {
  tryCatch({
    result <- fromJSON(file)
    
    og <- stringr::str_extract(basename(file), "^OG[0-9]+")
    input_file <- result[["input"]][["file name"]]
    seq_count <- result[["input"]][["number of sequences"]]
    aln_length <- result[["input"]][["number of sites"]]
    
    test_results <- result[["test results"]]
    
    pval <- as.numeric(test_results[["p-value"]])
    k_val <- as.numeric(test_results[["relaxation or intensification parameter"]])
    
    selection_type <- case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
    
    suspect <- is.na(k_val) || k_val > 10 || k_val < 0.1 || is.na(pval) || aln_length < 100 || seq_count < 4
    
    tibble(
      file = file,
      input_file = input_file,
      orthogroup = og,
      seq_count = seq_count,
      aln_length = aln_length,
      k = k_val,
      pval = pval,
      padj = NA,  # placeholder, will be set after all parsing
      selection_type = selection_type,
      suspect_result = suspect
    )
  }, error = function(e) {
    message("⚠️ Error parsing ", file, ": ", e$message)
    return(NULL)
  })
}

relax_results <- parse_all_relax_jsons(input_dir)

if (nrow(relax_results) > 0) {
  relax_results <- relax_results %>%
    mutate(
      padj = p.adjust(pval, method = "BH"),
      significant = padj < 0.05
    )
}

parse_all_relax_jsons <- function(folder) {
  files <- list.files(folder, pattern = "\\.json$", full.names = TRUE)
  files <- files[file.info(files)$size > 0]
  
  results <- purrr::map_dfr(files, parse_relax_json)
  
  results <- results %>%
    mutate(
      padj = p.adjust(pval, method = "BH"),
      significant = padj < 0.05
    )
  
  return(results)
}

# ============ EXECUTE PARSING ============
relax_results <- parse_all_relax_jsons(input_dir)

# ============ WRITE OUTPUT ============
write_csv(relax_results, file.path(output_dir, "relax_results.csv"))
message("✅ Parsed RELAX results saved to: ", file.path(output_dir, "relax_results_csv"))

Combined results

# Load required libraries
library(readr)
library(dplyr)

# === Define file paths ===
busted_file <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedBUSTEDResults_labeled_Pruned/busted_orthogroup_summary.csv"
relax_file  <- "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/relax_results.csv"

# === Read in both tables ===
busted_df <- read_csv(busted_file, show_col_types = FALSE)
relax_df  <- read_csv(relax_file, show_col_types = FALSE)

# === Left join BUSTED + RELAX results ===
combined_df <- left_join(busted_df, relax_df, by = "orthogroup")

# === Preview and save ===
head(combined_df)

# A tibble: 6 × 33
  orthogroup selection_status suspect_result.x pval_foreground padj_foreground
  <chr>      <chr>            <lgl>                      <dbl>           <dbl>
1 OG0004339  No selection     TRUE                   0.5             0.5      
2 OG0004340  Background only  FALSE                  0.188           0.188    
3 OG0004341  Foreground only  TRUE                   0.0000218       0.0000218
4 OG0004343  No selection     FALSE                  0.0943          0.0943   
5 OG0004344  No selection     TRUE                   0.114           0.114    
6 OG0004345  Foreground only  FALSE                  0.0378          0.0378   
# ℹ 28 more variables: pval_background <dbl>, padj_background <dbl>,
#   seq_count_foreground <dbl>, seq_count_background <dbl>,
#   aln_length_foreground <dbl>, aln_length_background <dbl>,
#   omega1_foreground <dbl>, omega1_background <dbl>, omega2_foreground <dbl>,
#   omega2_background <dbl>, omega3_foreground <dbl>, omega3_background <dbl>,
#   prop1_foreground <dbl>, prop1_background <dbl>, prop2_foreground <dbl>,
#   prop2_background <dbl>, prop_sites_foreground <dbl>, …

# Save combined table
write_csv(combined_df, "/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/joint_busted_relax_results.csv")
message("✅ Combined BUSTED + RELAX table saved.")

✅ Combined BUSTED + RELAX table saved.

10. Combined BUSTED and RELAX

Full tree

# Load libraries
library(readr)
library(dplyr)
library(ComplexUpset)
library(ggplot2)

# Load your dataset
df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Recalculate selection_type from k and pval
df <- df %>%
  mutate(
    k_val = as.numeric(k),
    pval = as.numeric(pval),
    padj = as.numeric(padj),
    selection_type = case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
  )

# Filter non-suspect orthogroups
df_suspect <- df %>%
  filter(selection_status != "No selection") %>%
  filter(suspect_result.x == FALSE) %>%
  mutate(
    PSG = selection_status %in% c("Foreground only", "Both foreground and background"),
    Relaxation = selection_type == "Relaxation",
    Intensification = selection_type == "Intensification",
    Insignificant = selection_type == "No significant difference"
  ) %>%
  dplyr::select(orthogroup, PSG, Relaxation, Intensification, Insignificant) %>%
  distinct()

# Add color groups: PSG > Relaxation > Other
df_suspect <- df_suspect %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

# Define color palette
custom_colors <- c(
  "PSG" = "orchid",         # Green
  "Relaxation" = "gold",   # Orange
  "Intensification" = "tomato",   # Orange
  "Other" = "black"         # Default gray
)



# Reorder factor levels BEFORE calling upset()
df_suspect_long <- df_suspect %>%
  pivot_longer(cols = c("PSG", "Relaxation", "Intensification", "Insignificant"),
               names_to = "set", values_to = "value") %>%
  filter(value) %>%
  mutate(set = factor(set, levels = c("Insignificant",  "Intensification", "Relaxation", "PSG"))) %>%
  pivot_wider(names_from = set, values_from = value, values_fill = FALSE)

# Add color groups again
df_suspect_long <- df_suspect_long %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

ComplexUpset::upset(
  df_suspect_long,
  intersect = c("Insignificant", "Intensification", "Relaxation", "PSG"),
  name = "Selection Category",
  sort_sets = FALSE,
  sort_intersections = FALSE,
      intersections=list(
        c('PSG', 'Relaxation'),
        c('PSG', 'Intensification'),
        c('PSG', 'Insignificant'),
        'Relaxation',
        'Intensification',
        'Insignificant'
    ),
 # sort_intersections_by = "degree",
  set_sizes = upset_set_size() +
    ggtitle("Set Size") +
    theme_minimal(),
  base_annotations = list(
    'Intersection size' = intersection_size(
      mapping = aes(fill = PSG_color),
      text = list(size = 3),
      bar_number_threshold = 10
    ) +
      scale_fill_manual(values = custom_colors, guide = "none")
  ),
  queries=list(
    upset_query(
            intersect=c('PSG', 'Relaxation'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('PSG', 'Intensification'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('PSG', 'Insignificant'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('Relaxation'),
            color='gold',
            fill='gold',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('Intensification'),
            color='tomato',
            fill='tomato',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(set='PSG', fill='orchid'),
    upset_query(set='Relaxation', fill='gold'),
    upset_query(set='Intensification', fill='tomato'),
    upset_query(set='Insignificant', fill='black')
    )) +
  ggtitle("Genes under positive selection in swarming species (Full tree)") +
  theme_minimal(base_size = 12)

Pruned tree

# Load libraries
library(readr)
library(dplyr)
library(ComplexUpset)
library(ggplot2)

# Load your dataset
df <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Recalculate selection_type from k and pval
df <- df %>%
  mutate(
    k_val = as.numeric(k),
    pval = as.numeric(pval),
    padj = as.numeric(padj),
    selection_type = case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
  )

# Filter non-suspect orthogroups
df_suspect <- df %>%
  filter(selection_status != "No selection") %>%
  filter(suspect_result.x == FALSE) %>%
  mutate(
    PSG = selection_status %in% c("Foreground only", "Both foreground and background"),
    Relaxation = selection_type == "Relaxation",
    Intensification = selection_type == "Intensification",
    Insignificant = selection_type == "No significant difference"
  ) %>%
  dplyr::select(orthogroup, PSG, Relaxation, Intensification, Insignificant) %>%
  distinct()

# Add color groups: PSG > Relaxation > Other
df_suspect <- df_suspect %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

# Define color palette
custom_colors <- c(
  "PSG" = "orchid",         # Green
  "Relaxation" = "gold",   # Orange
  "Intensification" = "tomato",   # Orange
  "Other" = "black"         # Default gray
)



# Reorder factor levels BEFORE calling upset()
df_suspect_long <- df_suspect %>%
  pivot_longer(cols = c("PSG", "Relaxation", "Intensification", "Insignificant"),
               names_to = "set", values_to = "value") %>%
  filter(value) %>%
  mutate(set = factor(set, levels = c("Insignificant",  "Intensification", "Relaxation", "PSG"))) %>%
  pivot_wider(names_from = set, values_from = value, values_fill = FALSE)

# Add color groups again
df_suspect_long <- df_suspect_long %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

ComplexUpset::upset(
  df_suspect_long,
  intersect = c("Insignificant", "Intensification", "Relaxation", "PSG"),
  name = "Selection Category",
  sort_sets = FALSE,
  sort_intersections = FALSE,
      intersections=list(
        c('PSG', 'Relaxation'),
        c('PSG', 'Intensification'),
        c('PSG', 'Insignificant'),
        'Relaxation',
        'Intensification',
        'Insignificant'
    ),
 # sort_intersections_by = "degree",
  set_sizes = upset_set_size() +
    ggtitle("Set Size") +
    theme_minimal(),
  base_annotations = list(
    'Intersection size' = intersection_size(
      mapping = aes(fill = PSG_color),
      text = list(size = 3),
      bar_number_threshold = 10
    ) +
      scale_fill_manual(values = custom_colors, guide = "none")
  ),
  queries=list(
    upset_query(
            intersect=c('PSG', 'Relaxation'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('PSG', 'Intensification'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('PSG', 'Insignificant'),
            color='orchid',
            fill='orchid',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('Relaxation'),
            color='gold',
            fill='gold',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(
            intersect=c('Intensification'),
            color='tomato',
            fill='tomato',
            only_components=c('intersections_matrix', 'Intersection size')
        ),
    upset_query(set='PSG', fill='orchid'),
    upset_query(set='Relaxation', fill='gold'),
    upset_query(set='Intensification', fill='tomato'),
    upset_query(set='Insignificant', fill='black')
    )) +
  ggtitle("Genes under positive selection in swarming species (Pruned tree)") +
  theme_minimal(base_size = 12)

Venn diagram

# Load required packages
library(readr)
library(dplyr)
library(ggvenn)

Loading required package: grid


Attaching package: 'grid'

The following object is masked from 'package:Biostrings':

    pattern

# Load Full tree dataset
df_full <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Load Pruned tree dataset
df_pruned <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Define helper function to get PSG + Intensification orthogroups
get_psg_intensified <- function(df) {
  df %>%
    mutate(
      k_val = as.numeric(k),
      pval = as.numeric(pval),
      selection_type = case_when(
        is.na(pval) ~ "Undetermined",
        pval < 0.05 & k_val > 1 ~ "Intensification",
        pval < 0.05 & k_val < 1 ~ "Relaxation",
        TRUE ~ "No significant difference"
      )
    ) %>%
    filter(suspect_result.x == FALSE) %>%
    filter(selection_status %in% c("Foreground only", "Both foreground and background")) %>%
    filter(selection_type == "Intensification") %>%
    pull(orthogroup) %>%
    unique()
}

# Get orthogroup sets
psg_intens_full <- get_psg_intensified(df_full)
psg_intens_pruned <- get_psg_intensified(df_pruned)

# Create named list for Venn input
venn_input <- list(
  FullTree = psg_intens_full,
  PrunedTree = psg_intens_pruned
)

# Plot Venn diagram
ggvenn(venn_input,
       fill_color = c("#66c2a5", "#fc8d62"),
       stroke_size = 0.7,
       set_name_size = 5,
       text_size = 4,
       show_percentage = FALSE) +
  ggtitle("PSGs under Intensification in swarming locusts (Full vs Pruned Tree)")

# Get the intersection of PSGs under intensification
intersect_psg_intens <- intersect(psg_intens_full, psg_intens_pruned)

# Show the result
length(intersect_psg_intens)  # Number of shared orthogroups

[1] 11

intersect_psg_intens          # List of orthogroup IDs

 [1] "OG0007006" "OG0007326" "OG0011236" "OG0011677" "OG0011869" "OG0011931"
 [7] "OG0012017" "OG0012034" "OG0012129" "OG0012163" "OG0012186"

For relaxation PSGs:

# Load required packages
library(readr)
library(dplyr)
library(ggvenn)

# Load Full tree dataset
df_full <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Load Pruned tree dataset
df_pruned <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/joint_busted_relax_annotated.csv", show_col_types = FALSE)

# Define helper function to get PSG + Intensification orthogroups
get_psg_relaxed <- function(df) {
  df %>%
    mutate(
      k_val = as.numeric(k),
      pval = as.numeric(pval),
      selection_type = case_when(
        is.na(pval) ~ "Undetermined",
        pval < 0.05 & k_val > 1 ~ "Intensification",
        pval < 0.05 & k_val < 1 ~ "Relaxation",
        TRUE ~ "No significant difference"
      )
    ) %>%
    filter(suspect_result.x == FALSE) %>%
    filter(selection_status %in% c("Foreground only", "Both foreground and background")) %>%
    filter(selection_type == "Relaxation") %>%
    pull(orthogroup) %>%
    unique()
}

# Get orthogroup sets
psg_relax_full <- get_psg_relaxed(df_full)
psg_relax_pruned <- get_psg_relaxed(df_pruned)

# Create named list for Venn input
venn_input <- list(
  FullTree = psg_relax_full,
  PrunedTree = psg_relax_pruned
)

# Plot Venn diagram
ggvenn(venn_input,
       fill_color = c("#66c2a5", "#fc8d62"),
       stroke_size = 0.7,
       set_name_size = 5,
       text_size = 4,
       show_percentage = FALSE) +
  ggtitle("PSGs under Relaxation in swarming locusts (Full vs Pruned Tree)")

# Get the intersection of PSGs under intensification
intersect_psg_relax <- intersect(psg_relax_full, psg_relax_pruned)

# Show the result
length(intersect_psg_relax)  # Number of shared orthogroups

[1] 8

intersect_psg_relax          # List of orthogroup IDs

[1] "OG0008483" "OG0008811" "OG0009185" "OG0011592" "OG0011838" "OG0011966"
[7] "OG0012059" "OG0012354"

11. DEG and PSGs

Full tree

Here we want to know if the PSG from the BUSTED+RELAX detection share an overlap with DEGs. We extracted the list of Orthogroup DEGs (shared by the three locusts) for this step:

# Install if needed
# install.packages("VennDiagram")

library(VennDiagram)

Loading required package: futile.logger

library(dplyr)
library(grid)

thorax <- c(
  "OG0000679", "OG0004144", "OG0000104", "OG0000015", "OG0014033", "OG0012058",
  "OG0000357", "OG0000090", "OG0003126", "OG0004306", "OG0000001", "OG0009321",
  "OG0015157", "OG0012103", "OG0004309", "OG0000346", "OG0000014", "OG0000796",
  "OG0000151", "OG0011174", "OG0013138", "OG0000003", "OG0000391", "OG0007893",
  "OG0001029", "OG0010128", "OG0001327", "OG0011184", "OG0000615", "OG0000922",
  "OG0000095", "OG0012329", "OG0010429", "OG0010105", "OG0012400", "OG0012312",
  "OG0000012", "OG0005229", "OG0000532", "OG0000027", "OG0000017", "OG0009757",
  "OG0002737", "OG0002903", "OG0011877", "OG0003752", "OG0007957", "OG0000000",
  "OG0009700", "OG0011824", "OG0000043", "OG0011853", "OG0000347", "OG0005741",
  "OG0003890", "OG0000334", "OG0000419", "OG0002738", "OG0000065", "OG0000130",
  "OG0000327", "OG0000093"
)

head <- c(
  "OG0000104", "OG0000015", "OG0000105", "OG0004296", "OG0000371", "OG0003126",
  "OG0004306", "OG0012979", "OG0009321", "OG0000073", "OG0002734", "OG0015157",
  "OG0000796", "OG0000151", "OG0000222", "OG0000296", "OG0000391", "OG0000196",
  "OG0010128", "OG0009808", "OG0000788", "OG0000922", "OG0000120", "OG0000212",
  "OG0002726", "OG0007990", "OG0003478", "OG0000027", "OG0002737", "OG0011877",
  "OG0007957", "OG0009113", "OG0000334", "OG0000823", "OG0002738", "OG0000093",
  "OG0000552", "OG0000553"
)

all_degs <- unique(c(thorax, head))

# Load Pruned tree dataset
df_pruned <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults/joint_busted_relax_annotated.csv", show_col_types = FALSE)


# Recalculate selection_type from k and pval
df <- df_pruned %>%
  mutate(
    k_val = as.numeric(k),
    pval = as.numeric(pval),
    padj = as.numeric(padj),
    selection_type = case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
  )

# Filter non-suspect orthogroups
df_suspect <- df %>%
  filter(selection_status != "No selection") %>%
  filter(suspect_result.x == FALSE) %>%
  mutate(
    PSG = selection_status %in% c("Foreground only", "Both foreground and background"),
    Relaxation = selection_type == "Relaxation",
    Intensification = selection_type == "Intensification",
    Insignificant = selection_type == "No significant difference"
  ) %>%
  dplyr::select(orthogroup, PSG, Relaxation, Intensification, Insignificant) %>%
  distinct()

# Add color groups: PSG > Relaxation > Other
df_suspect <- df_suspect %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

# Define color palette
custom_colors <- c(
  "PSG" = "orchid",         # Green
  "Relaxation" = "gold",   # Orange
  "Intensification" = "tomato",   # Orange
  "Other" = "black"         # Default gray
)



# Reorder factor levels BEFORE calling upset()
df_suspect_long <- df_suspect %>%
  pivot_longer(cols = c("PSG", "Relaxation", "Intensification", "Insignificant"),
               names_to = "set", values_to = "value") %>%
  filter(value) %>%
  mutate(set = factor(set, levels = c("Insignificant",  "Intensification", "Relaxation", "PSG"))) %>%
  pivot_wider(names_from = set, values_from = value, values_fill = FALSE)

# Add color groups again
df_suspect_long <- df_suspect_long %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )


# Extract PSGs from your annotated dataframe
psgs <- df_suspect_long %>% 
  filter(PSG) %>% 
  pull(orthogroup) %>% 
  unique()


# Draw the Venn diagram
venn.plot <- draw.pairwise.venn(
  area1 = length(psgs),
  area2 = length(all_degs),
  cross.area = length(intersect(psgs, all_degs)),
  category = c("PSGs", "DEGs"),
  fill = c("orchid", "deepskyblue"),
  lty = "blank",
  cex = 2,
  cat.cex = 2,
  cat.pos = c(-20, 20),
  cat.dist = c(0.05, 0.05)
)

# Display the plot
grid.newpage()
grid.draw(venn.plot)

# Get the intersection of PSGs under intensification
intersect_psg_deg <- intersect(psgs, all_degs)

# Show the result
length(intersect_psg_deg)  # Number of shared orthogroups

[1] 1

intersect_psg_deg          # List of orthogroup IDs

[1] "OG0012312"

Pruned tree

Here we want to know if the PSG from the BUSTED+RELAX detection share an overlap with DEGs. We extracted the list of Orthogroup DEGs (shared by the three locusts) for this step:

# Install if needed
# install.packages("VennDiagram")

library(VennDiagram)
library(dplyr)
library(grid)

thorax <- c(
  "OG0000679", "OG0004144", "OG0000104", "OG0000015", "OG0014033", "OG0012058",
  "OG0000357", "OG0000090", "OG0003126", "OG0004306", "OG0000001", "OG0009321",
  "OG0015157", "OG0012103", "OG0004309", "OG0000346", "OG0000014", "OG0000796",
  "OG0000151", "OG0011174", "OG0013138", "OG0000003", "OG0000391", "OG0007893",
  "OG0001029", "OG0010128", "OG0001327", "OG0011184", "OG0000615", "OG0000922",
  "OG0000095", "OG0012329", "OG0010429", "OG0010105", "OG0012400", "OG0012312",
  "OG0000012", "OG0005229", "OG0000532", "OG0000027", "OG0000017", "OG0009757",
  "OG0002737", "OG0002903", "OG0011877", "OG0003752", "OG0007957", "OG0000000",
  "OG0009700", "OG0011824", "OG0000043", "OG0011853", "OG0000347", "OG0005741",
  "OG0003890", "OG0000334", "OG0000419", "OG0002738", "OG0000065", "OG0000130",
  "OG0000327", "OG0000093"
)

head <- c(
  "OG0000104", "OG0000015", "OG0000105", "OG0004296", "OG0000371", "OG0003126",
  "OG0004306", "OG0012979", "OG0009321", "OG0000073", "OG0002734", "OG0015157",
  "OG0000796", "OG0000151", "OG0000222", "OG0000296", "OG0000391", "OG0000196",
  "OG0010128", "OG0009808", "OG0000788", "OG0000922", "OG0000120", "OG0000212",
  "OG0002726", "OG0007990", "OG0003478", "OG0000027", "OG0002737", "OG0011877",
  "OG0007957", "OG0009113", "OG0000334", "OG0000823", "OG0002738", "OG0000093",
  "OG0000552", "OG0000553"
)

all_degs <- unique(c(thorax, head))

# Load Pruned tree dataset
df_pruned <- read_csv("/Users/maevatecher/Desktop/Polyneoptera_FINAL/ParsedRELAXResults_Pruned/joint_busted_relax_annotated.csv", show_col_types = FALSE)


# Recalculate selection_type from k and pval
df <- df_pruned %>%
  mutate(
    k_val = as.numeric(k),
    pval = as.numeric(pval),
    padj = as.numeric(padj),
    selection_type = case_when(
      is.na(pval) ~ "Undetermined",
      pval < 0.05 & k_val > 1 ~ "Intensification",
      pval < 0.05 & k_val < 1 ~ "Relaxation",
      TRUE ~ "No significant difference"
    )
  )

# Filter non-suspect orthogroups
df_suspect <- df %>%
  filter(selection_status != "No selection") %>%
  filter(suspect_result.x == FALSE) %>%
  mutate(
    PSG = selection_status %in% c("Foreground only", "Both foreground and background"),
    Relaxation = selection_type == "Relaxation",
    Intensification = selection_type == "Intensification",
    Insignificant = selection_type == "No significant difference"
  ) %>%
  dplyr::select(orthogroup, PSG, Relaxation, Intensification, Insignificant) %>%
  distinct()

# Add color groups: PSG > Relaxation > Other
df_suspect <- df_suspect %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )

# Define color palette
custom_colors <- c(
  "PSG" = "orchid",         # Green
  "Relaxation" = "gold",   # Orange
  "Intensification" = "tomato",   # Orange
  "Other" = "black"         # Default gray
)



# Reorder factor levels BEFORE calling upset()
df_suspect_long <- df_suspect %>%
  pivot_longer(cols = c("PSG", "Relaxation", "Intensification", "Insignificant"),
               names_to = "set", values_to = "value") %>%
  filter(value) %>%
  mutate(set = factor(set, levels = c("Insignificant",  "Intensification", "Relaxation", "PSG"))) %>%
  pivot_wider(names_from = set, values_from = value, values_fill = FALSE)

# Add color groups again
df_suspect_long <- df_suspect_long %>%
  mutate(
    PSG_color = case_when(
      PSG ~ "PSG",
      Relaxation ~ "Relaxation",
      Intensification ~ "Intensification",
      TRUE ~ "Other"
    )
  )


# Extract PSGs from your annotated dataframe
psgs <- df_suspect_long %>% 
  filter(PSG) %>% 
  pull(orthogroup) %>% 
  unique()


# Draw the Venn diagram
venn.plot <- draw.pairwise.venn(
  area1 = length(psgs),
  area2 = length(all_degs),
  cross.area = length(intersect(psgs, all_degs)),
  category = c("PSGs", "DEGs"),
  fill = c("orchid", "deepskyblue"),
  lty = "blank",
  cex = 4,
  cat.cex = 2,
  cat.pos = c(-20, 20),
  cat.dist = c(0.05, 0.05)
)

# Display the plot
grid.newpage()
grid.draw(venn.plot)

# Get the intersection of PSGs under intensification
intersect_psg_deg <- intersect(psgs, all_degs)

# Show the result
length(intersect_psg_deg)  # Number of shared orthogroups

[1] 2

intersect_psg_deg          # List of orthogroup IDs

[1] "OG0010128" "OG0012312"

sessionInfo()

R version 4.4.2 (2024-10-31)
Platform: aarch64-apple-darwin20
Running under: macOS Sequoia 15.6.1

Matrix products: default
BLAS:   /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRblas.0.dylib 
LAPACK: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRlapack.dylib;  LAPACK version 3.12.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: Asia/Tokyo
tzcode source: internal

attached base packages:
[1] grid      stats4    stats     graphics  grDevices utils     datasets 
[8] methods   base     

other attached packages:
 [1] VennDiagram_1.7.3      futile.logger_1.4.3    ggvenn_0.1.10         
 [4] ComplexUpset_1.3.6     plotly_4.11.0          ggnewscale_0.5.2      
 [7] hexbin_1.28.5          lubridate_1.9.4        forcats_1.0.0         
[10] purrr_1.0.4            tidyr_1.3.1            tidyverse_2.0.0       
[13] tibble_3.3.0           stringr_1.5.1          jsonlite_2.0.0        
[16] DesertLocustR_0.1.0    remotes_2.5.0          Biostrings_2.74.1     
[19] XVector_0.46.0         AnnotationHub_3.14.0   BiocFileCache_2.14.0  
[22] dbplyr_2.5.0           rtracklayer_1.66.0     GenomicRanges_1.58.0  
[25] GenomeInfoDb_1.42.3    GO.db_3.20.0           AnnotationDbi_1.68.0  
[28] IRanges_2.40.1         S4Vectors_0.44.0       Biobase_2.66.0        
[31] BiocGenerics_0.52.0    clusterProfiler_4.14.6 data.table_1.17.6     
[34] readr_2.1.5            dplyr_1.1.4            ggplot2_3.5.2         

loaded via a namespace (and not attached):
  [1] splines_4.4.2               later_1.4.2                
  [3] BiocIO_1.16.0               bitops_1.0-9               
  [5] ggplotify_0.1.2             filelock_1.0.3             
  [7] R.oo_1.27.1                 XML_3.99-0.18              
  [9] lifecycle_1.0.4             rprojroot_2.0.4            
 [11] lattice_0.22-7              vroom_1.6.5                
 [13] magrittr_2.0.3              sass_0.4.10                
 [15] rmarkdown_2.29              jquerylib_0.1.4            
 [17] yaml_2.3.10                 httpuv_1.6.16              
 [19] ggtangle_0.0.6              cowplot_1.1.3              
 [21] DBI_1.2.3                   RColorBrewer_1.1-3         
 [23] abind_1.4-8                 zlibbioc_1.52.0            
 [25] R.utils_2.13.0              RCurl_1.98-1.17            
 [27] yulab.utils_0.2.0           rappdirs_0.3.3             
 [29] git2r_0.36.2                GenomeInfoDbData_1.2.13    
 [31] enrichplot_1.26.6           ggrepel_0.9.6              
 [33] tidytree_0.4.6              codetools_0.2-20           
 [35] DelayedArray_0.32.0         DOSE_4.0.1                 
 [37] tidyselect_1.2.1            aplot_0.2.7                
 [39] UCSC.utils_1.2.0            farver_2.1.2               
 [41] matrixStats_1.5.0           GenomicAlignments_1.42.0   
 [43] tools_4.4.2                 treeio_1.30.0              
 [45] Rcpp_1.0.14                 glue_1.8.0                 
 [47] SparseArray_1.6.2           xfun_0.52                  
 [49] qvalue_2.38.0               MatrixGenerics_1.18.1      
 [51] withr_3.0.2                 formatR_1.14               
 [53] BiocManager_1.30.26         fastmap_1.2.0              
 [55] digest_0.6.37               timechange_0.3.0           
 [57] R6_2.6.1                    gridGraphics_0.5-1         
 [59] colorspace_2.1-1            dichromat_2.0-0.1          
 [61] RSQLite_2.4.1               R.methodsS3_1.8.2          
 [63] generics_0.1.4              httr_1.4.7                 
 [65] htmlwidgets_1.6.4           S4Arrays_1.6.0             
 [67] whisker_0.4.1               pkgconfig_2.0.3            
 [69] gtable_0.3.6                blob_1.2.4                 
 [71] workflowr_1.7.1             htmltools_0.5.8.1          
 [73] fgsea_1.32.4                scales_1.4.0               
 [75] png_0.1-8                   ggfun_0.1.9                
 [77] knitr_1.50                  lambda.r_1.2.4             
 [79] rstudioapi_0.17.1           tzdb_0.5.0                 
 [81] reshape2_1.4.4              rjson_0.2.23               
 [83] nlme_3.1-168                curl_6.4.0                 
 [85] cachem_1.1.0                BiocVersion_3.20.0         
 [87] parallel_4.4.2              restfulr_0.0.15            
 [89] pillar_1.10.2               vctrs_0.6.5                
 [91] promises_1.3.3              evaluate_1.0.4             
 [93] cli_3.6.5                   compiler_4.4.2             
 [95] futile.options_1.0.1        Rsamtools_2.22.0           
 [97] rlang_1.1.6                 crayon_1.5.3               
 [99] labeling_0.4.3              plyr_1.8.9                 
[101] fs_1.6.6                    stringi_1.8.7              
[103] viridisLite_0.4.2           BiocParallel_1.40.2        
[105] lazyeval_0.2.2              GOSemSim_2.32.0            
[107] Matrix_1.7-3                hms_1.1.3                  
[109] patchwork_1.3.1             bit64_4.6.0-1              
[111] KEGGREST_1.46.0             SummarizedExperiment_1.36.0
[113] igraph_2.1.4                memoise_2.0.1              
[115] bslib_0.9.0                 ggtree_3.14.0              
[117] fastmatch_1.1-6             bit_4.6.0                  
[119] ape_5.8-1                   gson_0.1.0

Signatures of selection: Did locusts or specific genes experience positive selection?

Maeva Techer

2025-09-17

Testing for signatures of selection using HyPhy: aBSREL, BUSTED and RELAX

1. Parsing orthogroups files for PAL2NAL

2. Generating codon-aware nucleotide alignments

3. Assembling nucleotide sequence orthogroups for input in HyPHY

4. Preparing labeled phylogenies

5. Annotating proteins with InterProScan and Orthogroups with KinFin

6. dN/dS FitMG94

7. aBSREL

Running the analysis

Unlabeled

Parsing the json files

Plotting the results

Annotating OGs under selection

8. BUSTED

Running the analysis

Unlabelled

Parsing the json files

Extracting the selected genes

Annotating OGs under selection

Labelled

Parsing the json files

Plotting fg vs bg

Labelled Pruned

Parsing the json files

Plotting fg vs bg

9. RELAX

Running the analysis

Labelled

Parsing the json files

Combined results

Labelled pruned

Parsing the json files

Combined results

10. Combined BUSTED and RELAX

Full tree

Pruned tree

Venn diagram

11. DEG and PSGs

Full tree

Pruned tree