I have download a promoter bed file from UCSC. And I have a promoter bed file from CAGE. In case of UCSC I look 1000bases upstream from gene and download that as bed file. I want to do the union of two bed files but before I do I need to look 1000bases upstream too in CAGE bed file too?
Furthermore, I was looking into enhancers database and for each enhancer position they've mentioned start, and end but also centre position. Why is it important to report the centre position for enhancers?
Insights will be appreciated.