DNA甲基化和 lncRNA 控制在特定印记基因领域的异步DNA复制.
Yui Imaizumi1,2, François Charon3, Caroline Surcis1,2
1CNRS, Institute of Molecular Genetics of Montpellier (IGMM), Montpellier, France.
Nature communications
|January 21, 2026
概括
父母DNA甲基化印记和长非编码RNA (lncRNA) Meg3控制印记域中的异步复制时间. 这种表观遗传调节取代了小鼠干细胞中典型的复制时间组织.
科学领域:
- 表观遗传学和基因组学
- 哺乳动物干细胞生物学
- 基因规则 基因规则
背景情况:
- 虽然已建立全基因组复制时间 (RT) 模式,但由于随机事件和遗传变异,一些基因在干细胞中表现出基复制异步.
- 表观遗传修饰的作用,特别是哺乳动物印记域中的DNA甲基化印记,在控制这种异步复制方面仍然在很大程度上未被探索.
研究的目的:
- 调查表观遗传修饰,特别是父母DNA甲基化印记,是否调节哺乳动物印记域中的异步复制.
- 确定长非编码RNAs (lncRNAs) 和DNA甲基化对这些域内的复制时间和染色质组织的影响.
主要方法:
- 在单亲和杂交小鼠胚胎干细胞 (ESC) 中进行了全基因组和特定位置的测试.
- 分析包括复制时间,DNA甲基化模式,3D染色体结构和基因表达.
- 生成突变小鼠系,以评估特定基因和 lncRNAs 的功能作用.
主要成果:
- 在小鼠ESC中Dlk1-Dio3和Snrpn印记域中观察到明显的,源自父的复制时间异步,这在神经分化时丢失了.
- 差异性DNA甲基化被确定为Dlk1-Dio3域中异步复制的调解者.
- 发现 lncRNA Meg3 控制了 Dlk1-Dio3 域内的母亲染色体的早期复制;没有发现复制时间和 TAD 组织之间的联系.
结论:
- 父母DNA甲基化印记和IncRNA表达,以Meg3为例,是印记域中复制时间异步的关键调节者.
- 这些表观遗传因素可以覆盖已建立的复制时间域组织,展示一种新的基因调节层.
- 这些发现突显了表观遗传学,lncRNA功能和DNA复制在控制基因组组织和基因表达的复杂相互作用.
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