由RNA Pol I抑制介导的NPM1错位化改变了染色质景观
Pierre-Olivier Estève1,2, Sagnik Sen1,2, Karthikeyan Raman1,2
1New England Biolabs Inc, 240 County Road, Ipswich, MA 01938, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
RNA聚合酶I抑制会破坏核细胞结构和染色体组织. 这导致基因组标记,DNA甲基化和基因组可访问性发生变化,影响核架构.
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.
- 细胞生物学 细胞生物学
背景情况:
- RNA聚合酶I (Pol I) 从核组织区域 (NOR) 内的rDNA集群转录核糖体RNA (rRNA).
- 核细胞结构和功能受到表观遗传修饰和蛋白质定位的严格调节.
研究的目的:
- 为了研究RNA Pol I抑制对核细胞结构和染色体景观的影响.
- 阐明这些变化背后的分子机制,重点关注基因素修饰和DNA甲基化.
主要方法:
- 使用特定抑制剂进行RNA聚合酶I抑制.
- 核胺1 (NPM1) 的siRNA介导的耗尽或解离.
- 染色体免疫沉 (ChIP) 试验用于分析组质子修饰 (H3K9ac,H3K9me3).
- 分析染色质可访问性和DNA甲基化.
- 使用Hi-C进行3D基因组架构分析.
主要成果:
- RNA Pol I 抑制会破坏细胞核架构和NPM1 的局部化.
- NPM1的耗尽促进了HDAC1的加载,导致H3K9脱乙和随后的H3K9甲基化由SUV39H1.1.
- 活跃的基因素标记被抑制的H3K9me3所取代,减少了染色质的可访问性,增加了DNA的高甲基化.
- 核相关联域 (NAD) 转化为压制性层相关联域 (LAD).
- 3D核架构进行了改造,A/B隔间重组和Hi-C循环的丢失.
结论:
- RNA Pol I 抑制触发了一系列表观遗传事件,这些事件改变了染色质状态和核组织.
- 这些变化涉及基因组修饰酶和DNA甲基转移酶的协调作用.
- 这项研究揭示了Pol I活动,核细胞完整性和全球表观遗传调节之间的联系.
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