现存RNA结合选择自体基因,并依赖重复B来调节它们的表达
Shengze Yao1,2, Yesu Jeon1,2, Barry Kesner1,2
1Department of Molecular Biology, Massachusetts General Hospital, Boston, United States.
eLife
|June 9, 2025
概括
对于X染色体不活化至关重要的XistRNA,针对大约100个自体基因,超出小鼠中不活跃的X染色体. 它的重复B动机是这个功能的关键,并且可以通过化学方法抑制破坏.
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.
- 基因组学就是基因组学.
- 在RNA生物学,RNA生物学.
背景情况:
- Xist是一种长非编码RNA,对X染色体无活化 (XCI) 至关重要.
- 传统上,Xist被认为是cis作用的RNA,只与不活跃的X染色体 (Xi) 结合.
- 有证据表明,在某些条件下,Xist可能具有超越Xi的功能.
研究的目的:
- 为了调查XistRNA是否可以局部化,并在不活跃的X染色体之外发挥作用.
- 确定Xist结合在转移中的目标和特征.
- 为了确定Xist的重复B图案在其中转函数中的作用.
主要方法:
- 在小鼠胚胎干细胞 (ES) 和纤维细胞 (MEFs) 中分析XistRNA局部化和结合.
- 基因表达分析,以评估Xist结合对自身基因的影响.
- 涉及转基因ES细胞的研究,具有改变的Xist表达和删除重复B动机.
- 用小分子抑制剂 (X1) 向Xist. 的治疗.
主要成果:
- 发现XistRNA位于Xi之外,与ES和MEF细胞中的大约100个自体基因结合.
- 目标基因被活跃转录,并位于Polycomb占用率低的区域,与人类XIST模式不同.
- 囊结合导致自体基因表达的下调,但不能完全沉默.
- Xist的重复B动机对于其自身体结合和调节功能至关重要.
- 与X1一起抑制Xist会破坏自身基因抑制.
结论:
- 基因组RNA在小鼠中表现出转基因作用的功能,针对一组特定的~100个自身基因.
- 重复B域对于Xist的跨界绑定和监管活动至关重要.
- 通过小分子抑制剂调节Xist对自体基因的向,提供潜在的治疗途径.
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