Last updated: 2020-12-23

Checks: 7 0

Knit directory: TARI_2020GS/

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Note that any generated files, e.g. HTML, png, CSS, etc., are not included in this status report because it is ok for generated content to have uncommitted changes.


These are the previous versions of the repository in which changes were made to the R Markdown (analysis/ImputeDCas20_5629.Rmd) and HTML (docs/ImputeDCas20_5629.html) files. If you’ve configured a remote Git repository (see ?wflow_git_remote), click on the hyperlinks in the table below to view the files as they were in that past version.

File Version Author Date Message
Rmd fae176a wolfemd 2020-12-23 Publish the first set of analyses and files for TARI 2020 GS.

DArTseqLD (DCas20-5629).

Copy data

Copy the imputation reference panel from 2019 to the data/ folder.

mkdir /workdir/mw489/
cp -r /home/jj332_cas/marnin/TARI_2020GS /workdir/mw489/
cp -r /home/jj332_cas/CassavaGenotypeData/CassavaGeneticMap /workdir/mw489/TARI_2020GS/data/
cp /home/jj332_cas/CassavaGenotypeData/nextgenImputation2019/ImputationEastAfrica_StageII_90919/chr*_ImputationReferencePanel_StageVI_91119.vcf.gz /workdir/mw489/TARI_2020GS/data/

Impute

Impute with Beagle V5.0.

Use the “imputation reference panel” dataset from 2019, e.g. chr1_ImputationReferencePanel_StageVI_91119.vcf.gz as reference.

Used 1 large memory Cornell CBSU machine (e.g. cbsulm16; 112 cores, 512 GB RAM), running 1 chromosome at a time.

R functions are stored in the code/ sub-directory. Functions sourced from e.g. imputationFunctions.R are wrappers around e.g. Beagle, and other command line programs.

cd /workdir/mw489/TARI_2020GS/
targetVCFpath<-here::here("data/Report-DCas20-5629") # location of the targetVCF
refVCFpath<-here::here("data/")
mapPath<-here::here("data/CassavaGeneticMap/")
outPath<-here::here("output/")
outSuffix<-"DCas20_5629"
source(here::here("code","imputationFunctions.R"))
# cbsurobbins using 64 cores 
purrr::map(1:18,~runBeagle5(targetVCF=paste0(targetVCFpath,"chr",.,"_DCas20_5629.vcf.gz"),
                            refVCF=paste0(refVCFpath,"chr",.,"_ImputationReferencePanel_StageVI_91119.vcf.gz"),
                            mapFile=paste0(mapPath,"chr",.,"_cassava_cM_pred.v6_91019.map"),
                            outName=paste0(outPath,"chr",.,"_DCas20_5629_EA_REFimputed"),
                            nthreads=64))

Clean up Beagle log files after run. Move to sub-directory output/BeagleLogs/.

cd /workdir/mw489/TARI_2020GS/output/; 
mkdir BeagleLogs;
cp *_DCas20_5629_EA_REFimputed.log BeagleLogs/
cp -r BeagleLogs /home/jj332_cas/marnin/TARI_2020GS/output/
cp *_DCas20_5629_EA_REFimputed* /home/jj332_cas/marnin/TARI_2020GS/output/

Post-impute filter

For now, the function will just do a fixed filter: AR2>0.75 (DR2>0.75 as of Beagle5.0), P_HWE>1e-20, MAF>0.005 [0.5%].

It can easily be modified in the future to include parameters to vary the filter specifications.

Input parameters

#' @inPath path to input VCF-to-be-filtered, can be left null if path included in @inName . Must end in "/"
#' @inName name of input VCF file EXCLUDING file extension. Assumes .vcf.gz
#' @outPath path where filtered VCF and related are to be stored.Can be left null if path included in @outName . Must end in "/".
#' @outName name desired for output EXCLUDING extension. Output will be .vcf.gz 

Loop to filter all 18 VCF files in parallel

inPath<-here::here("output/")
outPath<-here::here("output/")
source(here::here("code","imputationFunctions.R"))
require(furrr); options(mc.cores=18); plan(multiprocess)
future_map(1:18,~postImputeFilter(inPath=inPath,
                                  inName=paste0("chr",.,"_DCas20_5629_EA_REFimputed"),
                                  outPath=outPath,
                                  outName=paste0("chr",.,"_DCas20_5629_EA_REFimputedAndFiltered")))

Check what’s left

purrr::map(1:18,~system(paste0("zcat ",here::here("output/"),"chr",.,"_DCas20_5629_EA_REFimputedAndFiltered.vcf.gz | wc -l")))
# 5785
# 2106
# 1951
# 2306
# 2271
# 2093
# 911
# 1795
# 2048
# 1504
# 1486
# 1881
# 1500
# 2757
# 2205
# 1562
# 1636
# 1519
cd /workdir/mw489/TARI_2020GS/output/;
cp -r *_DCas20_5629_EA_REFimputed* /home/jj332_cas/marnin/TARI_2020GS/output/

Formats for downstream analysis

The function below will (1) convert the input VCF to plink1.9 binary format and (2) convert the plink binary to a dosage (0,1,2) matrix with special attention to which allele gets counted in the file.

NOTICE: I was worried about plink1.9 changing allele codes between files. There is some risk the counted allele could switch between e.g. the reference panel and the progeny files because of allele freq. (see plink documentation). To avoid this, went to extra trouble: write a file suffixed *.alleleToCount listing SNP ID (column 1) and the ALT allele from the VCF (column 2). Pass the file to plink1.9 using the --recode-allele flag to ensure all output dosages count the ALT allele consistent with the VCFs. The reason to use plink1.9 is that Beagle5 imputed files don’t have a DS (dosage) field that can be directly extracted. Instead, phased genotypes e.g. 0|1 need to be converted to dosages (e.g. 0|1 --> 1, 1|1 --> 2). An alternative might be to extract the haplotypes using vcftools and manually (in R) computed the dosages; that would give most control but is slow.

cd /home/jj332_cas/marnin/TARI_2020GS/;
library(tidyverse); library(magrittr);
source(here::here("code","imputationFunctions.R"))
require(furrr); options(mc.cores=18); plan(multiprocess)
pathOut<-here::here("output/")

# Imputation reference panel
future_map(1:18,~convertVCFtoDosage(pathIn="/home/jj332_cas/CassavaGenotypeData/nextgenImputation2019/ImputationEastAfrica_StageII_90919/",
                                    pathOut=pathOut,
                                    vcfName = paste0("chr",.,"_ImputationReferencePanel_StageVI_91119")))
# DCas20_5629
future_map(1:18,~convertVCFtoDosage(pathIn=here::here("output/"),pathOut=pathOut,
                                    vcfName = paste0("chr",.,"_DCas20_5629_EA_REFimputedAndFiltered")))

# Genome-wide dosage (for use in R) for each dataset
# Imputation reference panels
createGenomewideDosage(pathIn = here::here("output/"), chroms=1:18, "_ImputationReferencePanel_StageVI_91119")
# DCas20_5629
createGenomewideDosage(pathIn = here::here("output/"), chroms=1:18, "_DCas20_5629_EA_REFimputedAndFiltered")

sessionInfo()