在小鼠精子生成过程中,piRNA加载触发了MIWI转移,从线粒体间的水泥到染色体体
Huan Wei1, Jie Gao2, Di-Hang Lin3
1Key Laboratory of Systems Health Science of Zhejiang Province, School of Life Science, Hangzhou Institute for Advanced Study, Hangzhou 310024; University of Chinese Academy of Sciences, Hangzhou, China.
Nature communications
|March 16, 2024
概括
在小鼠中,Piwi交互RNA (piRNA) 的加载触发了MIWI蛋白从线粒体间的泥向染色体的运动. 这个过程对男性生育能力和正常的精子生成至关重要.
科学领域:
- 分子和细胞生物学分子和细胞生物学
- 生殖生物学 生殖生物学
- 在RNA生物学,RNA生物学.
背景情况:
- 线粒体间凝固体 (IMC) 和染色体体 (CB) 是哺乳动物雄性生殖细胞中piRNA活动的关键器官.
- 一种PIWI-clade蛋白质MIWI最初在IMC中用于piRNA处理,后来转移到CB中进行功能.
- 规范MIWI在IMC和CB之间转移的精确机制尚未完全理解.
研究的目的:
- 阐明控制MIWI从IMC转移到CB的监管机制.
- 调查piRNA加载在MIWI亚细胞局部化和功能中的作用.
- 为了确定piRNA负载受损对精子生成和男性生育能力的影响.
主要方法:
- 研究MIWI蛋白质动力学和小鼠雄性生殖细胞内的相互作用.
- 利用技术来评估piRNA加载效率及其对MIWI定位的影响.
- 通过基因操纵检查了破坏piRNA加载对精子生成和男性生育能力的影响.
主要成果:
- 确定piRNA负载是MIWI从IMC转移到CB的关键触发因素.
- 皮RNA加载削弱了MIWI与线粒体定TDRKH的相互作用,促进其从IMC释放.
- 释放后,MIWI经历了氨酸甲基化,增强了它与TDRD6的结合,用于CB集成;piRNA负载的损失导致MIWI陷入困境和不稳定,导致不孕.
结论:
- 皮RNA加载对于调节MIWI转位至关重要,这是精子发生过程中piRNA通路执行的关键步骤.
- 这种转位机制确保了CB中的MIWI功能正常,这对男性生殖细胞发育至关重要.
- 破坏piRNA载荷和随后的MIWI错位导致小鼠有缺陷的精子生成和雄性不育.
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