Created
August 12, 2019 21:52
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Function to calculate SPIA scores for DESeq2 results table
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resFile <- "DESeq2_result_name" # has to have entrez ids as annotations | |
compName <- "comparison" # Name of the comparison | |
calcSPIA <- function(resFile, compName) | |
{ | |
res <- read.table(resFile, header = T, sep = "\t", fill=T, quote = "\"", stringsAsFactors = F) | |
# Select differentially expressed genes (adjusted p-value < 0.05) | |
# This is a named vector, where names are entrez ids, and values are log2 fold changes | |
ids <- res[res$padj < 0.05,]$entrezgene_id | |
logFC <- res[res$padj < 0.05,]$log2FoldChange | |
DE_genes <- logFC | |
names(DE_genes) <- ids | |
DE_genes <- DE_genes[!is.na(names(DE_genes))] | |
# Get all expressed genes entrez ids | |
ALL_genes <- res$entrezgene_id | |
ALL_genes <- ALL_genes[!is.na(ALL_genes)] | |
res <- spia(de=DE_genes, all=ALL_genes, organism="hsa", nB=2000, plots=FALSE, beta=NULL, combine="fisher", verbose=FALSE) | |
write.table(res, file=paste(compName, "_SPIA_result.txt", sep = ""), sep = "\t", col.names = T, row.names = F, quote = F) | |
tiff(file=paste(compName, "_SPIA_result.tiff", sep = ""), width=500, height=500) | |
plotP(res, threshold = 0.05) | |
dev.off() | |
} |
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