Helicases play an important role in DNA replication as they bind and unwind double stranded DNA into single strands. BRIP1 gene encodes a protein belonging to the RecQ DEAH helicase family and thus functions as a 5’ to 3’ DNA helicase as well as a DNA dependent ATPase. It interacts with BRCA1 to repair DNA double strand breaks.
Mutations in the BRIP1 gene impair its ability to repair DNA. This results in a build-up of inter-strand crosslinks ultimately stalling DNA replication and triggering either abnormal cell death or uncontrolled cell growth. Abnormal cell death leads to the loss of blood cells and manifests as Fanconi anaemia while uncontrolled cell growth develops into cancers. Germline mutations in the BRIP1 gene are associated with early-onset breast cancer. These are usually inactivating truncating mutations and are monoallelic. Mutations resulting in Fanconi anaemia are either homozygous or compound heterozygous in nature.