Human spike-in experiments
Last updated: 2023-08-08
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| Rmd | 0c24851 | mcmero | 2023-08-08 | Added human mixture variant analysis |
Human samples are duplicate of 1% spike-in of 8393 (son of Chinese ancestry HG-005) in 8391 (son of Eastern European Ashkenazi Jewish ancestry HG-0020). Reference.
library(ggplot2)
library(data.table)
library(dplyr)
library(here)
library(tibble)
library(stringr)
library(Rsamtools)
library(GenomicRanges)
library(seqinr)
library(parallel)
library(readxl)
library(patchwork)
library(RColorBrewer)
library(UpSetR)
library(vcfR)
library(R.utils)
library(knitr)source(here('code/load_data.R'))
source(here('code/plot.R'))
source(here('code/efficiency_nanoseq_functions.R'))variant_dir <- here('data/human_mixture_vars')
region_bed <- here('data/human_mixture_capture_region.bed')
hg002_var_file <- here('data/human_mixture_refs/HG002_GRCh38_1_22_v4.2.1_benchmark.vcf.gz')
hg005_var_file <- here('data/human_mixture_refs/HG005_GRCh38_1_22_v4.2.1_benchmark.vcf.gz')sample_names <- c('Human1pR1', 'Human1pR2')
# load variant data
var_df <- load_variants(variant_dir, sample_names)
hg002_vars <- read.vcfR(hg002_var_file, verbose = FALSE)
hg005_vars <- read.vcfR(hg005_var_file, verbose = FALSE)
hg002v <- data.frame(hg002_vars@fix)
hg005v <- data.frame(hg005_vars@fix)
# get capture regions
regions <- read.delim(region_bed, sep = '\t', header = FALSE)Variant Upset plot
Here we remove any “N” variant calls and INDELs and compare the overlaps for on- and off-target variant calls.
# remove any N calls and INDELs
var_df <- filter(var_df, ALT != "N") %>%
filter(., (ALT %>% str_split("") %>% lapply(., length) %>% unlist) == 1) %>%
filter(., (REF %>% str_split("") %>% lapply(., length) %>% unlist) == 1) %>%
calculate_vafs_nvc(.)
# get capture region range
grx <- GRanges(seqnames = paste0("chr", regions$V1),
ranges = IRanges(start = regions$V2, end = regions$V3))
vrx <- GRanges(seqnames = var_df$CHROM,
ranges = IRanges(start = as.numeric(var_df$POS),
end = as.numeric(var_df$POS) + 1))
var_df$on_target <- overlapsAny(vrx, grx)
# make upsetplot
ulist <- NULL
for(sample in sample_names) {
ont_ids <- var_df[var_df$sample %in% sample & var_df$on_target,]$id
oft_ids <- var_df[var_df$sample %in% sample & !var_df$on_target,]$id
ulist[[paste(sample, "ontarget")]] <- ont_ids
ulist[[paste(sample, "offtarget")]] <- oft_ids
}
upset(fromList(ulist), order.by='freq', nsets=4)
Variant allele frequencies
Here we plot the allelic frequencies per-replicate in three plots:
- all filtered variant calls: no frequency or target filtering
- on-target variant calls: only on-target variant calls (in capture region)
- VAF-filtered on-target variant calls: all on-target variants under <0.3% VAF
ggplot(var_df, aes(VAF)) +
geom_histogram(binwidth = 0.05) +
facet_grid(~sample) +
theme_minimal() +
ggtitle("All filtered variant calls")
ggplot(var_df[var_df$on_target,], aes(VAF)) +
geom_histogram(binwidth = 0.05) +
facet_grid(~sample) +
theme_minimal() +
ggtitle("On-target variant calls")
ggplot(var_df[var_df$on_target & var_df$VAF < 0.3,], aes(VAF)) +
geom_histogram(binwidth = 0.01) +
facet_grid(~sample) +
theme_minimal() +
ggtitle("On-target variant calls < 0.3 VAF")
Variant comparison
Given the referene information, we check how many SNPs are present in the capture area. We also filter out any variants that are common between the two samples (if the same variant appears in both samples, we can’t differentiate the calls without some kind of phasing).
# filter out any INDELs
hg005v <- filter(hg005v, (ALT %>% str_split("") %>% lapply(., length) %>% unlist) == 1) %>%
filter(., (REF %>% str_split("") %>% lapply(., length) %>% unlist) == 1)
# construct Granges for hg005 SNPs and keep only SNPs in capture area
hg5x <- GRanges(seqnames = hg005v$CHROM,
ranges = IRanges(start = as.numeric(hg005v$POS),
end = as.numeric(hg005v$POS) + 1),
variant = hg005v$ALT)
hg5x <- hg5x[overlapsAny(hg5x, grx) %>% suppressWarnings()]
# construct Granges for hg002
hg2x <- GRanges(seqnames = hg002v$CHROM,
ranges = IRanges(start = as.numeric(hg002v$POS),
end = as.numeric(hg002v$POS) + 1),
variant = hg002v$ALT)
# check variants that overlap, we will keep these if they call a different base
unique_vars <- hg5x[overlapsAny(hg5x, hg2x)]$variant != hg2x[overlapsAny(hg2x, hg5x)]$variant
hg5x <- c(hg5x[!overlapsAny(hg5x, hg2x)], hg5x[overlapsAny(hg5x, hg2x)][unique_vars])
kable(hg5x)| seqnames | start | end | width | strand | variant |
|---|---|---|---|---|---|
| chr1 | 114714012 | 114714013 | 2 | * | G |
| chr3 | 128486108 | 128486109 | 2 | * | T |
| chr5 | 177516672 | 177516673 | 2 | * | T |
| chr9 | 5069837 | 5069838 | 2 | * | A |
| chr10 | 87970403 | 87970404 | 2 | * | T |
| chr11 | 32396399 | 32396400 | 2 | * | C |
| chr11 | 64805130 | 64805131 | 2 | * | A |
| chr11 | 64810148 | 64810149 | 2 | * | C |
| chr17 | 7676301 | 7676302 | 2 | * | T |
kable(var_df[var_df$POS %in% start(hg5x) & var_df$CHROM %in% seqnames(hg5x),])| CHROM | POS | ID | REF | ALT | QUAL | FILTER | INFO | FORMAT | Sample1 | sample | id | VAF | on_target | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 127 | chr5 | 177516672 | NA | C | T | NA | NA | AC=2;AF=0.0104712041885 | GT:AC:AF:NC | 0:2:0.0104712041885:C=189,T=2, | Human1pR1 | chr5_177516672 | 0.0104712 | TRUE |
| 231 | chr10 | 87970403 | NA | C | T | NA | NA | AC=2;AF=0.00393700787402 | GT:AC:AF:NC | 0:2:0.00393700787402:C=506,T=2, | Human1pR1 | chr10_87970403 | 0.0039370 | TRUE |
| 260 | chr11 | 32396399 | NA | T | C | NA | NA | AC=4;AF=0.0121951219512 | GT:AC:AF:NC | 0:4:0.0121951219512:C=4,T=324, | Human1pR1 | chr11_32396399 | 0.0121951 | TRUE |
| 517 | chr3 | 128486108 | NA | C | T | NA | NA | AC=3;AF=0.0260869565217 | GT:AC:AF:NC | 0:3:0.0260869565217:C=112,T=3, | Human1pR2 | chr3_128486108 | 0.0260870 | TRUE |
| 732 | chr11 | 32396399 | NA | T | C | NA | NA | AC=3;AF=0.0125 | GT:AC:AF:NC | 0:3:0.0125:C=3,T=237, | Human1pR2 | chr11_32396399 | 0.0125000 | TRUE |
sessionInfo()R version 4.3.0 (2023-04-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)
Matrix products: default
BLAS: /stornext/System/data/apps/R/R-4.3.0/lib64/R/lib/libRblas.so
LAPACK: /stornext/System/data/apps/R/R-4.3.0/lib64/R/lib/libRlapack.so; LAPACK version 3.11.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
time zone: Australia/Melbourne
tzcode source: system (glibc)
attached base packages:
[1] parallel stats4 stats graphics grDevices utils datasets
[8] methods base
other attached packages:
[1] knitr_1.43 R.utils_2.12.2 R.oo_1.25.0
[4] R.methodsS3_1.8.2 vcfR_1.14.0 UpSetR_1.4.0
[7] RColorBrewer_1.1-3 patchwork_1.1.2 readxl_1.4.3
[10] seqinr_4.2-30 Rsamtools_2.16.0 Biostrings_2.68.1
[13] XVector_0.40.0 GenomicRanges_1.52.0 GenomeInfoDb_1.36.1
[16] IRanges_2.34.1 S4Vectors_0.38.1 BiocGenerics_0.46.0
[19] stringr_1.5.0 tibble_3.2.1 here_1.0.1
[22] dplyr_1.1.2 data.table_1.14.8 ggplot2_3.4.2
[25] workflowr_1.7.0
loaded via a namespace (and not attached):
[1] ade4_1.7-22 tidyselect_1.2.0 viridisLite_0.4.2
[4] farver_2.1.1 bitops_1.0-7 fastmap_1.1.1
[7] RCurl_1.98-1.12 promises_1.2.0.1 digest_0.6.33
[10] lifecycle_1.0.3 cluster_2.1.4 processx_3.8.2
[13] magrittr_2.0.3 compiler_4.3.0 rlang_1.1.1
[16] sass_0.4.7 tools_4.3.0 utf8_1.2.3
[19] yaml_2.3.7 labeling_0.4.2 plyr_1.8.8
[22] BiocParallel_1.34.2 memuse_4.2-3 withr_2.5.0
[25] grid_4.3.0 fansi_1.0.4 git2r_0.32.0
[28] colorspace_2.1-0 scales_1.2.1 MASS_7.3-58.4
[31] cli_3.6.1 rmarkdown_2.23 vegan_2.6-4
[34] crayon_1.5.2 generics_0.1.3 rstudioapi_0.15.0
[37] httr_1.4.6 ape_5.7-1 cachem_1.0.8
[40] zlibbioc_1.46.0 splines_4.3.0 cellranger_1.1.0
[43] vctrs_0.6.3 Matrix_1.5-4 jsonlite_1.8.7
[46] callr_3.7.3 jquerylib_0.1.4 glue_1.6.2
[49] codetools_0.2-19 ps_1.7.5 stringi_1.7.12
[52] gtable_0.3.3 later_1.3.1 munsell_0.5.0
[55] pillar_1.9.0 htmltools_0.5.5 GenomeInfoDbData_1.2.10
[58] R6_2.5.1 pinfsc50_1.2.0 rprojroot_2.0.3
[61] evaluate_0.21 lattice_0.21-8 highr_0.10
[64] httpuv_1.6.11 bslib_0.5.0 Rcpp_1.0.11
[67] gridExtra_2.3 nlme_3.1-162 permute_0.9-7
[70] mgcv_1.8-42 whisker_0.4.1 xfun_0.39
[73] fs_1.6.3 getPass_0.2-2 pkgconfig_2.0.3