Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.
Nat Cell Biol. 2017 Oct 31;19(11):1309-1310. doi: 10.1038/ncb3638.
PARP inhibitors (PARPi) kill BRCA1/2-mutated cancers, which become resistant when DNA repair functions are restored. Now, MUS81 nuclease inhibition due to EZH2 downregulation is found to restore DNA replication fork protection but not repair, leading to PARPi-resistance in mutant BRCA2 cells and patients. This challenges the DNA repair dominance in synthetic lethality.
聚腺苷二磷酸核糖聚合酶(PARP)抑制剂(PARPi)可杀死 BRCA1/2 突变的癌症,当 DNA 修复功能恢复时,这些癌症会产生耐药性。现在,发现由于 EZH2 下调导致 MUS81 核酸内切酶抑制作用,可恢复 DNA 复制叉保护,但不能修复,从而导致突变型 BRCA2 细胞和患者对 PARPi 的耐药性。这对合成致死性中的 DNA 修复优势提出了挑战。