Introduction

An R-package of simplified GSEA. This is my first writing a whole r-package code. The package is only used to simple analyze GSEA with the most default parameters, but the result of siGSEA is similar to official GSEA. The purpose of writing this package is the reason that i feel the R code of GSEA in its web is so old (2005) that i want to rewrite.

Installation

library(devtools)
install_github("kaigu1990/siGSEA")

Quick run

Loading libraries

library(Matrix)

Loading expression file and gene set file (expr data and gene set files are modified test files from GSEA web)

data<- read.table(file = "Gender_test.gct", sep = "\t", header = T, row.names = 1, stringsAsFactors = F, quote = "")
group <- c(rep("m", 15), rep("f", 17))
class <- factor(group)
gene_set <- readLines("C1.gmt")

Running siGSEA

res <- simple_gsea(dataexpr = data, 
               	   group = class, 
                   geneset = gene_set, 
                   gsminsize = 15, 
                   gsmaxsize = 500, 
                   nperm = 1000)

Plot GSEA graph

1. Show a certain gene set

    gseaplot(expr = data, list = res, gset = "chr10q11")
   

2. Output all gene set, such as nompval < 0.05 & FDR < 0.25

    gseaplot(expr = data, list = res, gset = NULL, nompval = 0.05, fdr = 0.25)