DNMT1可以通过 de novo DNA 甲基化诱导初级生殖层的分化
Takamasa Ito1, Musashi Kubiura-Ichimaru1, Fumihito Miura2
1Stem Cells & Reprogramming Laboratory, Department of Biology, Faculty of Science, Toho University, Chiba, Japan.
概括
DNA甲基转移酶调节胚胎的发育. 即使没有维护活动,DNMT1也会阻止干细胞分化,并有助于生殖系的发展,揭示了超越DNA甲基化维护的新角色.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
- 遗传学 遗传学是一种遗传学.
背景情况:
- 基因甲基化和脱甲基化对胚胎发育至关重要,由DNA甲基转移酶 (DNMTs) 和十-十一转位 (TET) 蛋白调节.
- DNMT1主要以维持DNA甲基化后复制而闻名,但其de novo甲基转移酶作用和更广泛的生理意义不明.
研究的目的:
- 调查全长DNMT1 (FL) 和截断突变 (602) 在小鼠胚胎干细胞 (ESC) 分化和发育中的作用.
- 阐明 DNMT1 的 de novo 甲基转移酶能力及其对早期发育过程中的表观遗传调节的影响.
主要方法:
- 产生了Dnmt1,Dnmt3a和Dnmt3b三重淘汰赛 (Dnmts-TKO) 鼠标ESC.
- 用全长DNMT1 (FL) 和缺乏N端的DNMT1突变体来补充Dnmts-TKO ESC (602).
- 使用胚胎体检测分析DNA甲基化 (5mC) 和基甲基化 (5hmC) 水平,基因表达和分化潜力的分析.
主要成果:
- 两种FL和602 DNMT1变种都抑制了Dnmts-TKO ESCs的自发分化,并部分恢复了DNA甲基化和基因表达缺陷.
- FL DNMT1在分化过程中促进了全球5mC和5hmC的积累,而602显示了异步的5hmC.
- 与602不同的是,FL DNMT1有效地推动了对表皮状,介皮和生殖系的分化.
结论:
- DNMT1具有显著的de novo甲基转移酶活性,对于防止ESC分化和促进生殖线发育至关重要.
- DNMT1的N终端区域对其维护活动至关重要,但也有助于准选择性和发育角色.
- DNMT1在表观遗传调节中发挥着多方面的作用,超越了DNA甲基化维护,影响了血统承诺和生殖线发展.
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