细胞系原始化中的增强器切换与eRNA,Brg1的AT和SWI/SNF招募有关
Dhurjhoti Saha1, Srinivas Animireddy1, Junwoo Lee1
1Department of Epigenetics and Molecular Carcinogenesis, UT MD Anderson Center, Houston, TX 77054, USA; UT MD Anderson Cancer, Center for Cancer Epigenetics, Houston, TX 77054, USA.
Molecular cell
|April 9, 2024
概括
增强器RNAs (eRNAs) 将SWI/SNF复合体招募到细胞类型特定的增强剂中,驱动基因转录在早期发育过程中对细胞身份至关重要. 这揭示了染色质重塑和eRNA功能之间的联系.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因规则 基因规则
背景情况:
- 提议增强器RNAs (eRNAs) 通过招募调节因子直接激活转录.
- 转录激活中的eRNA功能的一般机制和范围仍然不清楚.
- 在基因调节中,SWI/SNF染色体重塑复合体起着关键作用.
研究的目的:
- 研究SWI/SNF复合体在eRNA介导的转录激活中的作用.
- 确定SWI/SNF如何与eRNA结合,并将其招募到增强器中.
- 阐明 eRNA 引导的 SWI/SNF 招募在细胞发育中的功能后果.
主要方法:
- 对SWI/SNF复合体与RNA结合的分析,特别是AT-hook域.
- 染色体免疫沉 (ChIP) 来评估SWI/SNF和eRNA与增强剂的相关性.
- 在不同的发育阶段使用细胞类型特定的增强剂研究增强剂活性.
主要成果:
- SWI/SNF复合体的AT-hook域优先结合RNA,并与来自内基和基因间区域的eRNA结合.
- 在特定的发育阶段,SWI/SNF在全球范围内被eRNA招募到细胞类型特定的增强剂中,而不是共享增强剂.
- 通过eRNA引导的SWI/SNF促进了MLL3/4,p300/CBP和Mediator的招募,以激活特定阶段和超级增强器.
结论:
- eRNAs作为指南,用于SWI/SNF向细胞类型特定增强剂的cis招募.
- 这种机制将依赖ATP的染色体重塑和eRNA功能与参与代谢过程和细胞系原始化的基因调节联系起来.
- 这些发现突出了连接eRNA,染色体重塑和细胞在发育过程中的身份建立的新途径.
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