Abstract
Objective: 53BP1 is a critical regulator of the balance between homologous recombination (HR) and the more error-prone nonhomologous endjoining (NHEJ) DNA repair. Deletion of 53BP1 in brca1- (but not brca2-) null cells rescues embryonic lethality, partially restores HR, and reverses sensitivity to poly-ADP ribose polymerase inhibitors (PARPi). We characterized 53BP1 and BRCA1 expression in a large number of primary and recurrent ovarian carcinomas to determine if 53BP1 expression is associated with clinical outcomes in sporadic and inherited cases.
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