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聚合体抑制的基因具有允许增强剂,可以启动重编程
Phillippa C Taberlay1, Theresa K Kelly, Chun-Chi Liu
1Department of Urology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
Cell
|December 14, 2011
概括
增强剂通过激活关键调节基因,在细胞命运重编程中发挥关键作用. 这些被H3K4me1标记的增强剂产生核细胞贫乏区域,促进转录调节器结合和染色质变化.
科学领域:
- 表观遗传学和基因调控
- 细胞重编程 细胞重编程
- 分子生物学分子生物学
背景情况:
- 多组组蛋白和H3K27me3甲基化抑制关键的调节基因.
- 这些基因在正常分化和诱导细胞重编程过程中被激活.
- 增强剂是基因表达的关键调节元素.
研究的目的:
- 以MYOD1基因为模型,研究增强剂在细胞命运重编程中的作用.
- 了解重编程过程中增强剂的初始分子事件.
- 阐明不同的转录因子如何影响促进体中的染色质状态.
主要方法:
- 对MYOD1基因的增强剂/促进剂对进行分析.
- 染色体分析,包括核细胞枯竭和基因组修饰概况 (H3K4me1,H3K27me3).
- 涉及外源Myod1和OCT4的研究,观察它们的结合和对基因转录和染色素的影响.
主要成果:
- 确定了一种H3K4me1丰富增强剂,具有核细胞贫乏区域 (NDR).
- 转录调节器最初与增强剂结合,诱导促进剂的染色质变化.
- 外源Myod1与增强剂结合,通过NDR和容许性促进体染色素激活自身的转录.
- 外源性OCT4与增强体结合导致促进体处的双价H3K27me3状态,这是干细胞的特征.
结论:
- 增强剂对于启动细胞命运重编程至关重要,因为它们促进了转录调节者的结合.
- MYOD1增强剂模型展示了增强剂如何控制促进体染色质状态和基因激活.
- 很大一部分Polycomb目标与允许增强剂有关,这表明重新编程启动的广泛机制.
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