BRCA2 is a human tumour suppressor gene that is located on chromosome 13. It produces a 3418 amino acid long protein. There is a 59% homology with mouse and even so, most regions have weak conservation. The gene is associated with various intracellular proteins including Ras51 (involved in DNA repair), BARD1, p53 (involved in maintaining genome integrity, cell cycle checkpoint and promotor of apoptosis) and p21 (a cell cycle inhibitor).
The gene was discovered because of the increased amount of mutations in patients with breast cancer.