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BARD1 读取 H2A 素 15 无化到直接同源重组
Jordan R Becker1,2, Gillian Clifford3, Clara Bonnet1,2
1Medical Research Council (MRC) Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
Nature
|July 29, 2021
概括
BRCA1-BARD1复合体通过一种新型动机将BRCA1招募到DNA双链断裂中,该动机涉及组织蛋白修饰. 这种相互作用对同类重组修复至关重要,并对抗53BP1通路.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- 在DNA双链断裂 (DSB) 中,RNF168介导的H2A的无处不在对于招募BRCA1和53BP1至关重要.
- 虽然通过H2AK15ub来招募53BP1,但RNF168对BRCA1招募的机制尚不清楚.
- 了解BRCA1是如何被招募的,是明确同源重组与非同源末端连接修复途径之间的关键.
研究的目的:
- 确定RNF168促进BRCA1向DSB招募的机制.
- 研究BARD1在BRCA1招募和同源重组中的作用.
- 阐明BRCA1-BARD1复合体如何协调DSB修复路径的选择.
主要方法:
- 在BARD1中识别了无处不在依赖的招募动机 (BUDR).
- 分析BARD1与无素基因子 (H2AK15ub) 和非甲基化H4K20的相互作用.
- 涉及RNF168和53BP1删除的遗传表试验.
主要成果:
- 一个新的BUDR在BARD1中参与H2AK15ub招募BRCA1到DSB.
- 破坏BARD1的BUDR会损害同源重组,并增加对PARP抑制剂和西斯普拉丁的敏感性.
- BARD1利用多价值相互作用与H2AK15ub和H4K20结合染色体并促进BRCA1- BARD1的功能.
- 当RNF168或53BP1缺失时,BARD1的染色体结合作用是没有必要的.
结论:
- BRCA1-BARD1复合体感知DNA损伤和复制后的基因组修饰,以控制DSB修复路径的选择.
- 鉴定到的BUDR和多价物相互作用突出显示了BRCA1招募和同源重组促进的机制.
- 这些发现为BRCA1-BARD1如何对抗53BP1通路并促进同源重组建立了一个范式.
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