53BP1-RIF1-shieldin通过CST和Polα依赖的填充来对抗DSB切除
Zachary Mirman1, Francisca Lottersberger1,2, Hiroyuki Takai1
1Laboratory for Cell Biology and Genetics, Rockefeller University, New York, NY, USA.
Nature
|July 20, 2018
概括
与聚合酶α一起作用的CTC1-STN1-TEN1 (CST) 综合体通过防止切除来控制DNA双链断裂的修复. 这种机制对BRCA1突变癌症至关重要.
科学领域:
- DNA 修复机制
- 癌症遗传学
- 分子生物学
背景情况:
- 通过同源导向修复 (HDR) 或非同源端连接 (NHEJ) 来修复DNA双链断裂 (DSB).
- BRCA1突变癌症由于最小的DSB切除而表现出缺陷的HDR,导致PARP1抑制剂敏感性.
- 已知BP1,RIF1和shieldin复合物可以防止BRCA1缺乏细胞的DSB切除.
研究的目的:
- 阐明53BP1-RIF1-shieldin在DSB修复过程中调节3'悬架的机制.
- 在控制DNA修复途径选择中确定53BP1途径的下游效应因子.
主要方法:
- 研究了CTC1-STN1-TEN1 (CST) 综合体与shieldin的相互作用及其定位在DNA损伤部位.
- 评估了CST耗尽对DSB切除和RAD51负载的影响.
- 研究了CST和聚合酶α抑制对BRCA1缺乏细胞中PARP1抑制剂有效性的影响.
主要成果:
- 与聚合酶α一起工作的CST复合体作为53BP1通路的下游效应体.
- 根据53BP1和shieldin,CST与shieldin相互作用并定位到DNA损伤部位.
- 通过阻断RAD51载荷,CST或聚合酶α的耗尽导致切除的增加,并影响BRCA1缺乏细胞中的PARP1抑制剂的有效性.
结论:
- CST-聚合酶-α复合物调解填充合成,与53BP1,RIF1和shieldin一起控制DSB修复路径的选择.
- 这种途径是BRCA1缺乏癌症中对PARP1抑制剂敏感性的关键决定因素.
- 针对CST-Polα途径可以为BRCA1突变癌症提供治疗策略.
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