原始生殖细胞的DNA脱甲基化和发育需要DNA转化合成
Pranay Shah1, Ross Hill2, Camille Dion3,4
1MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK. pranayshah96@gmail.com.
Nature communications
|May 3, 2024
概括
DNA转化合成 (TLS) 对于早期的生殖细胞发育和生育是至关重要的. 像REV1这样的关键TLS因子的丧失,通过防止原始生殖细胞的形成和表观遗传重编程,导致不育.
科学领域:
- 生殖生物学 生殖生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- DNA损伤反应 (DDR) 突变与人类不孕症有关.
- DNA转化合成 (TLS) 是一个DDR途径,对于绕过复制障碍至关重要.
- 胚胎细胞的发育和半转化需要DDR机制.
研究的目的:
- 研究TLS在哺乳动物生殖细胞发育和生育能力中的作用.
- 确定TLS是否对早期胚胎生殖细胞进展至关重要.
- 了解TLS缺陷对生殖线表观遗传重编程的影响.
主要方法:
- 对缺少REV1的人类PGC类细胞 (hPGCLCs) 的分析.
- 对TLS缺陷的小鼠模型的生成和分析 (Rev1-/- , PcnaK164R/K164R,Rev7-/-).
- 评估原始生殖细胞 (PGC) 数量,生育能力,体组织恒温,转录程序激活和DNA脱甲基化.
主要成果:
- 失去TLS因子显著抑制hPGCLC的诱导.
- 缺乏TLS的小鼠的PGC减少了150倍以上,并且无菌.
- 缺少TLS不会影响体质组织的生长,功能或平衡.
- 在TLS缺陷的胚胎中,生殖细胞转录程序激活和DNA脱甲基化失败.
结论:
- 在哺乳动物中,TLS对于预兆生殖细胞发育至关重要.
- 对于原始生殖细胞的形成和表观遗传重编程来说,TLS是必要的,而不仅仅是介质重组.
- 在TLS的缺陷导致不孕症,由于在早期的生殖细胞发育阶段的失败.
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