edgeR versus DESeq2
2024-10-23
Last updated: 2024-10-23
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Knit directory: muse/
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| File | Version | Author | Date | Message |
|---|---|---|---|---|
| Rmd | e471135 | Dave Tang | 2024-10-23 | edgeR versus DESeq2 |
Installation
Install packages using BiocManager::install().
if (!require("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install("edgeR")
BiocManager::install("DESeq2")Count table
https://zenodo.org/records/13970886
my_url <- 'https://zenodo.org/records/13970886/files/rsem.merged.gene_counts.tsv?download=1'
my_file <- 'rsem.merged.gene_counts.tsv'
if(file.exists(my_file) == FALSE){
download.file(url = my_url, destfile = my_file)
}
gene_counts <- read_tsv("rsem.merged.gene_counts.tsv", show_col_types = FALSE)
head(gene_counts)# A tibble: 6 × 10
gene_id `transcript_id(s)` ERR160122 ERR160123 ERR160124 ERR164473 ERR164550
<chr> <chr> <dbl> <dbl> <dbl> <dbl> <dbl>
1 ENSG0000… ENST00000373020,E… 2 6 5 374 1637
2 ENSG0000… ENST00000373031,E… 19 40 28 0 1
3 ENSG0000… ENST00000371582,E… 268. 274. 429. 489 637
4 ENSG0000… ENST00000367770,E… 360. 449. 566. 363. 606.
5 ENSG0000… ENST00000286031,E… 156. 185. 265. 85.4 312.
6 ENSG0000… ENST00000374003,E… 24 23 40 1181 423
# ℹ 3 more variables: ERR164551 <dbl>, ERR164552 <dbl>, ERR164554 <dbl>Metadata.
tibble::tribble(
~sample, ~run_id, ~group,
"C2_norm", "ERR160122", "normal",
"C3_norm", "ERR160123", "normal",
"C5_norm", "ERR160124", "normal",
"C1_norm", "ERR164473", "normal",
"C1_cancer", "ERR164550", "cancer",
"C2_cancer", "ERR164551", "cancer",
"C3_cancer", "ERR164552", "cancer",
"C5_cancer", "ERR164554", "cancer"
) -> my_metadata
my_metadata$group <- factor(my_metadata$group, levels = c('normal', 'cancer'))Matrix.
Remove genes that are lowly expressed.
keep <- rowSums(cpm(gene_counts_mat) > 0.5) >= 2
gene_counts_mat <- gene_counts_mat[keep, ]
tail(gene_counts_mat) C2_norm C3_norm C5_norm C1_norm C1_cancer C2_cancer C3_cancer
ENSG00000293576 0 7 12 0 0 0 0
ENSG00000293586 157 157 193 21 40 15 0
ENSG00000293587 3 3 5 0 2 1 0
ENSG00000293588 4 5 6 1 2 5 2
ENSG00000293595 3 5 3 0 0 0 0
ENSG00000293600 45 59 85 561 789 1099 701
C5_cancer
ENSG00000293576 0
ENSG00000293586 10
ENSG00000293587 3
ENSG00000293588 3
ENSG00000293595 0
ENSG00000293600 845edgeR workflow
DESeq2 workflow
lung_cancer <- DESeqDataSetFromMatrix(
countData = gene_counts_mat,
colData = my_metadata,
design = ~ group
)
lung_cancer <- DESeq(lung_cancer)estimating size factorsestimating dispersionsgene-wise dispersion estimatesmean-dispersion relationshipfinal dispersion estimatesfitting model and testinglung_cancer_res <- results(lung_cancer, pAdjustMethod = "BH")
lung_cancer_res[order(lung_cancer_res$padj), ] |> head(10)log2 fold change (MLE): group cancer vs normal
Wald test p-value: group cancer vs normal
DataFrame with 10 rows and 6 columns
baseMean log2FoldChange lfcSE stat pvalue
<numeric> <numeric> <numeric> <numeric> <numeric>
ENSG00000211893 13264.627 6.54532 0.564034 11.60448 3.91049e-31
ENSG00000100985 627.926 5.35553 0.494870 10.82209 2.70522e-27
ENSG00000211892 4174.271 5.09062 0.482865 10.54252 5.50060e-26
ENSG00000169385 214.909 -4.60663 0.486305 -9.47271 2.72667e-21
ENSG00000172288 760.700 -27.98296 2.956493 -9.46492 2.93793e-21
ENSG00000236424 2182.510 -29.42478 3.099437 -9.49359 2.23219e-21
ENSG00000211897 6680.207 5.40162 0.574687 9.39924 5.49588e-21
ENSG00000211966 262.489 5.05816 0.539184 9.38115 6.52570e-21
ENSG00000290677 155.595 -4.71772 0.505092 -9.34033 9.60378e-21
ENSG00000182415 515.257 -27.44538 2.958942 -9.27541 1.76945e-20
padj
<numeric>
ENSG00000211893 1.43867e-26
ENSG00000100985 4.97625e-23
ENSG00000211892 6.74557e-22
ENSG00000169385 1.80144e-17
ENSG00000172288 1.80144e-17
ENSG00000236424 1.80144e-17
ENSG00000211897 2.88848e-17
ENSG00000211966 3.00101e-17
ENSG00000290677 3.92581e-17
ENSG00000182415 5.91801e-17Compare differentially expressed genes
my_thres <- 0.01
topTags(res, n = Inf, adjust.method = "BH") |>
as.data.frame() |>
dplyr::filter(FDR < my_thres) |>
row.names() -> edger_degs
lung_cancer_res |>
as.data.frame() |>
dplyr::filter(padj < my_thres) |>
row.names() -> deseq2_degs
jaccard_index <- function(set1, set2) {
length(intersect(set1, set2)) / length(union(set1, set2))
}
jaccard_index(edger_degs, deseq2_degs)[1] 0.2256522DESeq2 returns a lot more differentially expressed genes (DEGs) than edgeR.
length(edger_degs)[1] 3918length(deseq2_degs)[1] 17363Compare top subset.
compare_degs <- function(my_topn){
topTags(res, n = Inf, adjust.method = "BH") |>
as.data.frame() |>
dplyr::filter(FDR < my_thres) |>
dplyr::slice_min(order_by = FDR, n = my_topn) |>
row.names() -> edger_degs_topn
lung_cancer_res |>
as.data.frame() |>
dplyr::filter(padj < my_thres) |>
dplyr::slice_min(order_by = padj, n = my_topn) |>
row.names() -> deseq2_degs_topn
jaccard_index(edger_degs_topn, deseq2_degs_topn)
}
compare_degs(500)[1] 0.245122Jaccard indexes.
ns <- seq(100, 3500, 100)
jis <- sapply(ns, compare_degs)Plot.
data.frame(n = ns, index = jis) |>
ggplot(aes(n, index)) +
geom_point() +
theme_minimal() +
labs(x = 'Subset size', y = 'Jaccard Index')
sessionInfo()R version 4.4.0 (2024-04-24)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 22.04.4 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so; LAPACK version 3.10.0
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: Etc/UTC
tzcode source: system (glibc)
attached base packages:
[1] stats4 stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] pheatmap_1.0.12 ggrepel_0.9.5
[3] DESeq2_1.44.0 SummarizedExperiment_1.34.0
[5] Biobase_2.64.0 MatrixGenerics_1.16.0
[7] matrixStats_1.3.0 GenomicRanges_1.56.1
[9] GenomeInfoDb_1.40.1 IRanges_2.38.1
[11] S4Vectors_0.42.1 BiocGenerics_0.50.0
[13] edgeR_4.2.1 limma_3.60.4
[15] lubridate_1.9.3 forcats_1.0.0
[17] stringr_1.5.1 dplyr_1.1.4
[19] purrr_1.0.2 readr_2.1.5
[21] tidyr_1.3.1 tibble_3.2.1
[23] ggplot2_3.5.1 tidyverse_2.0.0
[25] workflowr_1.7.1
loaded via a namespace (and not attached):
[1] tidyselect_1.2.1 farver_2.1.2 fastmap_1.2.0
[4] promises_1.3.0 digest_0.6.37 timechange_0.3.0
[7] lifecycle_1.0.4 statmod_1.5.0 processx_3.8.4
[10] magrittr_2.0.3 compiler_4.4.0 rlang_1.1.4
[13] sass_0.4.9 tools_4.4.0 utf8_1.2.4
[16] yaml_2.3.8 knitr_1.47 labeling_0.4.3
[19] S4Arrays_1.4.1 bit_4.0.5 DelayedArray_0.30.1
[22] RColorBrewer_1.1-3 abind_1.4-5 BiocParallel_1.38.0
[25] withr_3.0.1 grid_4.4.0 fansi_1.0.6
[28] git2r_0.33.0 colorspace_2.1-0 scales_1.3.0
[31] cli_3.6.3 rmarkdown_2.27 crayon_1.5.2
[34] generics_0.1.3 rstudioapi_0.16.0 httr_1.4.7
[37] tzdb_0.4.0 cachem_1.1.0 splines_4.4.0
[40] zlibbioc_1.50.0 parallel_4.4.0 XVector_0.44.0
[43] vctrs_0.6.5 Matrix_1.7-0 jsonlite_1.8.8
[46] callr_3.7.6 hms_1.1.3 bit64_4.0.5
[49] locfit_1.5-9.9 jquerylib_0.1.4 glue_1.7.0
[52] codetools_0.2-20 ps_1.7.6 stringi_1.8.4
[55] gtable_0.3.5 later_1.3.2 UCSC.utils_1.0.0
[58] munsell_0.5.1 pillar_1.9.0 htmltools_0.5.8.1
[61] GenomeInfoDbData_1.2.12 R6_2.5.1 rprojroot_2.0.4
[64] vroom_1.6.5 evaluate_0.24.0 lattice_0.22-6
[67] highr_0.11 httpuv_1.6.15 bslib_0.7.0
[70] Rcpp_1.0.12 SparseArray_1.4.8 whisker_0.4.1
[73] xfun_0.44 fs_1.6.4 getPass_0.2-4
[76] pkgconfig_2.0.3