代码库8-获得hg38启动子并添加gene symbol

library(TxDb.Hsapiens.UCSC.hg38.knownGene)
library(org.Hs.eg.db)

txdb <- TxDb.Hsapiens.UCSC.hg38.knownGene
gene_gr <- genes(txdb)
promoter_gr <- promoters(gene_gr)
promoter_gr$gene_symbol <- mapIds(x = org.Hs.eg.db,
                                  keys = promoter_gr$gene_id, 
                                  keytype = "ENTREZID", #需要转换的类型
                                  column = "SYMBOL") #需要转换为的类型
head(promoter_gr)