通过XIST的早期染色体凝聚建立了A重复RNA密度,这有助于基因沉默
Melvys Valledor1, Meg Byron1, Brett Dumas2
1Department of Neurology, University of Massachusetts Chan Medical School, Worcester, MA 01655, USA.
Cell reports
|June 29, 2023
概括
在广泛的基因沉默之前,长非编码RNA XIST通过改变染色体结构来启动巴尔体的形成. 它的A-重复区域对于通过基因脱乙化来快速静止基因至关重要.
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.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- XIST RNA对于X染色体不活化至关重要,导致巴尔体的形成和基因沉默.
- 精确的早期事件和XIST诱导的结构变化仍然不完全理解.
研究的目的:
- 为了研究由可诱导人类XIST引发的初始分子和结构变化.
- 为了阐明XIST介导的染色体凝聚和基因沉默事件的时间序列.
主要方法:
- 利用可诱导的人类XIST来追踪早期的分子事件.
- 采用免疫光来检测组织蛋白修饰 (H2AK119ub,H3K27me3) 和蛋白质结合 (CIZ1).
- 分析了与XIST RNA分布和密度相关的RNA/DNA区域和基因沉默.
主要成果:
- XIST RNA 快速修改细胞架构,在 2-4 小时内形成稀疏和密集的区域.
- 稀少的XIST转录诱导H2AK119ub和CIZ1结合;H3K27me3在密集区域以后出现.
- 染色体凝聚和基因沉默发生在RNA/DNA区域紧缩后,A重复通过基因素脱乙烯化促进快速沉默.
结论:
- 通过影响建筑元素,XIST RNA启动了染色体凝聚,从而创造了驱动基因沉默的RNA密度.
- 在X染色体无活化过程中,XIST A重复对于快速,脱乙烯化依赖的沉默步骤至关重要.
关键词:
A-重复一个字.巴尔的身体,巴尔的身体.CIZ1 是一个国际商业组织.科普:分子生物学 分子生物学科普:干细胞研究这就是H3K27的原因.这就是 UbH2A.XIST XIST 这是一个很好的例子.染色体结构的结构是染色体结构.表观遗传学是指表观遗传学.异性染色是一种异性染色.转录 转录 是一种转录.更多相关视频
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