該基因屬于參與從蛋白質中去除泛素的去泛素酶的泛素C末端水解酶亞家族。編碼酶通過乳腺癌1型易感性蛋白（BRCA1）的環指域與之結合，并作為腫瘤抑制因子。此外，該酶還可能參與轉錄調節、細胞周期和生長調節、對DNA損傷的反應和染色質動力學。該基因的種系突變可能與腫瘤易感綜合征（TPDS）有關，該綜合征會增加癌癥的風險，包括惡性間皮瘤、葡萄膜黑色素瘤和皮膚黑色素瘤。
This gene belongs to the ubiquitin C-terminal hydrolase subfamily of deubiquitinating enzymes that are involved in the removal of ubiquitin from proteins. The encoded enzyme binds to the breast cancer type 1 susceptibility protein (BRCA1) via the RING finger domain of the latter and acts as a tumor suppressor. In addition, the enzyme may be involved in regulation of transcription, regulation of cell cycle and growth, response to DNA damage and chromatin dynamics. Germline mutations in this gene may be associated with tumor predisposition syndrome (TPDS), which involves increased risk of cancers including malignant mesothelioma, uveal melanoma and cutaneous melanoma.