H3K27脱甲基酶Utx调节体和生殖细胞的表观遗传重编程
Abed AlFatah Mansour1, Ohad Gafni, Leehee Weinberger
1The Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.
Nature
|July 18, 2012
概括
基因组脱甲基酶Utx (Kdm6a) 通过调节表观遗传变化,对于将体细胞有效重编程成诱导多能干细胞 (iPSCs) 至关重要. Utx在原始生殖细胞的发展中也起着关键作用.
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.
- 干细胞生物学 干细胞生物学
- 发育生物学 发展生物学
背景情况:
- 诱导多能干细胞 (iPSC) 是通过转录因子表达 (OSKM) 从体细胞生成的.
- 表观遗传修饰伴随着iPSC的产生,但其生物化学调节尚未完全理解.
- 基因组修饰剂在重编程中的作用需要进一步研究.
研究的目的:
- 调查素H3K27脱甲基酶Utx (Kdm6a) 在诱导和维持多能性的作用.
- 阐明Utx在体细胞和生殖细胞发育的表观遗传重编程中的作用.
- 了解Utx如何促进多能性基因的减压.
主要方法:
- 利用小鼠和人类细胞模型,包括胚胎干细胞和体细胞.
- 采用基因操纵 (Utx淘汰) 来评估其在重编程和生殖细胞发育中的功能.
- 在重编程过程中进行了基因组分析,以研究染色质修饰 (H3K27me3动态).
主要成果:
- Utx对于体细胞中多能性的有效诱导而不是维持至关重要.
- 缺乏UTX的体细胞无法强大地重新编程到多能性.
- Utx直接与重编程因子相互作用,并促进H3K27me3脱甲基化,从而使多能性基因激活.
- 在体内,UTX对于正常的表观遗传重编程和原始生殖细胞 (PGC) 的发育至关重要.
- Utx缺乏导致异常的PGC发育和减少生殖系传播.
结论:
- Utx是一种新型调解剂,通过调节关键的表观遗传动力学,对有效的iPSC诱导至关重要.
- Utx在重建多能性和生殖细胞发育中起着不同的作用.
- 这些发现表明,抑制性染色质损失的调节者在体内可以被选择用于体内多能性重编程.
相关概念视频
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