循环F-EXO1轴控制细胞周期依赖的双链断裂修复执行
Hongbin Yang1, Shahd Fouad1, Paul Smith1,2
1MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK.
Science advances
|August 9, 2024
概括
乌比基因化调节DNA双链断裂 (DSB) 修复途径. SCFcyclin F酶在线粒分裂中降解EXO1,使微同质介导端结合 (MMEJ) 能够有效修复DSB.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- DNA双链断裂 (DSB) 是一种关键的DNA损伤.
- 通过同类重组 (HR),非同类末端连接 (NHEJ),微同质介导末端连接 (MMEJ) 和单链回火 (SSA) 来修复DSB.
- 控制DSB修复路径选择的机制在很大程度上是未知的.
研究的目的:
- 系统地识别在电离辐射 (IR) 诱导的DSB后参与细胞存活的基因.
- 阐明在调节DSB修复路径选择中的泛素系统的作用.
- 为了研究E3泛素酶SCF环林F在细胞周期依赖的DSB修复中的功能.
主要方法:
- 用高分辨率的CRISPR选,对全域素系统进行查.
- 对IR后细胞存活的基因要求的分析.
- 研究不同细胞周期阶段的蛋白质降解和DNA修复通路活性.
主要成果:
- 鉴定了在IR暴露后调节细胞存活的关键基因.
- 在细胞循环依赖的DSB修复中,证明了E3泛基因酶SCF环林F的关键作用.
- 表明SCFcyclin F介导的EXO1降解可以防止DNA末端在线粒分裂中的切除,促进MMEJ.
- 发现了一种涉及细胞循环控制的新型环林F识别动机.
结论:
- SCFcyclin F是通过控制线粒分裂中的DNA切割来及时和准确地修复DSB的必要条件.
- 通过SCFcyclin F调节EXO1降解,确保了MMEJ的适当使用.
- 鉴定到的环F基因对理解环特异性和细胞周期调节有广泛的意义.
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