BRIP1 also named as BACH1, FANCJ or ATP dependent RNA helicase BRIP1 is a 1249 amino acid protein, which contains one helicase ATP-binding domain and belongs to the DEAD box heilicase family, DEAH subfamily. BRIP1 contains nuclear localization signal and is ubiquitously expressed with highest levels in testis, an expression pattern similar to that of BRCA1. BRIP1 is required to resolve the secondary structures of guanine-rich DNA that occasionally form during lagging-strand DNA synthesis.