如何获取KEGG Pathway上一个pathway的gene

library(KEGGREST)
library(org.Hs.eg.db)
library(tidyverse)

hsa_path_eg  <- keggLink("pathway", "hsa") %>% 
  tibble(pathway = ., eg = sub("hsa:", "", names(.)))

hsa_kegg_anno <- hsa_path_eg %>%
  mutate(
    symbol = mapIds(org.Hs.eg.db, eg, "SYMBOL", "ENTREZID"),
    ensembl = mapIds(org.Hs.eg.db, eg, "ENSEMBL", "ENTREZID")
  )

首先导入相应的R包和数据。（上面程序里用到的几个R包需要用biomanager来安装。）hsa_kegg_anno即包含了KEGG数据库中，所有与人有关的pathway的全部gene list。

下面我们选择出我们想要的pathway的gene list。以hsa04066为例

result = hsa_kegg_anno[hsa_kegg_anno$pathway == 'path:hsa04066', ]

最后将我们需要的数据保存下来

geneName_geneID = result[,3:4]
write.table(geneName_geneID,file = 'filename.txt',
            sep = '\t',row.names = FALSE,col.names = TRUE)