get promoter region + operate on genomic intervals for T2WEB

Script

#a<-unique(biomart$entrezgene)

biomart<-read.table(genes_mapped,header=TRUE, sep="\t")
mat<-matrix(NA, nrow=dim(biomart)[1], ncol=10)
colnames(mat)<-c(colnames(biomart),"promoter_start","promoter_end")
for (i in 1:dim(biomart)[1] ) {
	if(biomart[i,3] > 0 ) {
	promoter_start<-as.numeric(biomart$transcript_start[i])-upstream
	promoter_end<-as.numeric(biomart$transcript_start[i])+downstream
   	mat[i,]<-c(biomart[i,1],as.character(biomart[i,2]),biomart[i,3],as.character(biomart[i,4]), biomart[i,5],biomart[i,6],biomart[i,7],biomart[i,8],promoter_start,promoter_end)	
	}	
	if(biomart[i,3] < 0 ) {
	promoter_start<-as.numeric(biomart$transcript_end[i])+upstream
	promoter_end<-as.numeric(biomart$transcript_end[i])-downstream
   	mat[i,]<-c(biomart[i,1],as.character(biomart[i,2]),biomart[i,3],as.character(biomart[i,4]), biomart[i,5],biomart[i,6],biomart[i,7],biomart[i,8],promoter_end,promoter_start)	
	}
}
dput(mat,promoter_file)




epigen_file<-read.table(epigenetic_file, header=TRUE, sep="\t")
epigen_file[,2]<-gsub("chr","",epigen_file[,2])

genes<-data.frame(mat,stringsAsFactors=FALSE)


library(GenomicRanges)

t1 <- GRanges(seqnames = genes$chromosome_name, ranges = IRanges(as.numeric(genes$promoter_start), as.numeric(genes$promoter_end) , names = genes$entrezgene))

t2 <- GRanges(seqnames = epigen_file[,inter_chr],ranges = IRanges(epigen_file[,inter_start], epigen_file[,inter_end]))

ov1<-findOverlaps(t1,t2,minoverlap=overlap)
print("ovdone")

genes_pvalues<-read.table(gene_expr_file,header=TRUE, sep="\t")

idx<-match(genes$entrezgene[as.matrix(ov1)[,1]],genes_pvalues$gene_id )

overlapping_genes<-genes$entrezgene[as.matrix(ov1)[,1]]
non_overlapping_genes<-genes$entrezgene[-(as.matrix(ov1)[,1])]
list_non_overlapping<-unique(non_overlapping_genes)
list_overlapping<-unique(overlapping_genes)

idx_com<-match(list_non_overlapping,list_overlapping)

idx_non_overlapping_without_overlapping_idx<-which(is.na(idx_com)==TRUE)
list_non_overlapping_new<-list_non_overlapping[idx_non_overlapping_without_overlapping_idx]

idx_overlapping<- match(list_overlapping, genes_pvalues$gene_id)
overlapping_genes_pvals<-genes_pvalues[idx_overlapping,]
#overlapping_genes_pvals_out<- paste("overlapping_genes",Sys.time(),".txt",sep="")

idx_non_overlapping<- match(list_non_overlapping_new, genes_pvalues$gene_id)
non_overlapping_genes_pvals<-genes_pvalues[idx_non_overlapping,]
#non_overlapping_genes_pvals_out<-paste("non_overlapping_genes",Sys.time(),".txt",sep="")

dput(overlapping_genes_pvals,overlapping_genes_pvals_file)
dput(non_overlapping_genes_pvals,non_overlapping_genes_pvals_file)


#write.table(overlapping_genes_pvals,overlapping_genes_pvals_out,col.names=TRUE, row.names=FALSE, sep="\t")
#write.table(non_overlapping_genes_pvals,non_overlapping_genes_pvals_out ,col.names=TRUE,row.names=FALSE,sep="\t")

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