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FIGNL1-FIRRM对于介质重组是必不可少的,并防止DNA损伤独立的RAD51和DMC1加载
Akbar Zainu1, Pauline Dupaigne2, Soumya Bouchouika1,3
1Institut de Génétique Humaine, University of Montpellier, CNRS, Montpellier, France.
Nature communications
|August 15, 2024
概括
菲吉丁类1 (FIGNL1) 和其调节剂FIRRM对于雄性小鼠中完整的半变异是必不可少的. 这种复合物限制了DNA修复蛋白的积累,确保了适当的同源重组和半变化期间的链入侵.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 遗传学是一种遗传学.
- 分子生物学分子生物学
背景情况:
- 介质分裂依赖于同源重组 (HR) 进行DNA双链断裂 (DSB) 修复,涉及RAD51和DMC1蛋白.
- 费吉丁类1 (FIGNL1) 在人类细胞中负面调节RAD51,但其在哺乳动物中的介质作用尚不清楚.
研究的目的:
- 在哺乳动物精子细胞中研究FIGNL1和FIGNL1相互作用调节器的重组和分裂 (FIRRM) 的介质功能.
- 阐明FIGNL1-FIRRM复合体在调节介质重组中的作用.
主要方法:
- 用于FIGNL1和FIRRM的雄性生殖系特异性条件淘汰 (cKO) 鼠标模型.
- 分析了介质性预相进展,DSB修复中间体和精子细胞中的蛋白质招募.
- 在纯化的人类FIGNL1.1进行了体外生化分析.
主要成果:
- 在小鼠精子细胞中,FIGNL1和FIRRM对于完成介质预相是不可或缺的.
- 在Fignl1和Firm cKO精子细胞中观察到晚期重组中间形成的缺陷.
- FIGNL1-FIRRM复合体限制了RAD51和DMC1在非DSB染色体上的积累.
- 在体外,FIGNL1 抑制了 RAD51/DMC1 丝结构和链入侵.
结论:
- FIGNL1-FIRRM复合体是哺乳动物中介性重组的新型负调节剂.
- 这个复合体控制RAD51/DMC1与染色质的关联,以确保有效的DSB修复和链入侵.
- FIGNL1和FIRRM对于在男性半月变异过程中保持基因组稳定性至关重要.
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