BRCA2

BRCA2 is a close partner to BRCA1 in the cell's high-accuracy repair shop. If a cell's DNA suffers a severe double-strand break, BRCA2 helps load the right repair tool exactly where it is needed, like a foreman handing the correct part to the worker who mends the break.

BRCA2 is a tumor-suppressor gene; its protein guides the RAD51 enzyme onto broken DNA so that homologous recombination can rebuild the strand faithfully using the sister chromosome as a guide. When BRCA2 is faulty, this precise repair fails, mutations accumulate, and genomic instability grows.

Inherited harmful BRCA2 variants raise lifetime risk of breast and ovarian cancer, and also of some other cancers such as prostate and pancreatic cancer, generally with patterns that overlap but are not identical to BRCA1. As with BRCA1, this is a predisposition that informs screening and prevention discussions within genetic counseling, not a certainty of disease.