在视网膜发育过程中,METTL3将染色质可访问性从转录分离
bioRxiv : the preprint server for biology
|November 19, 2025
概括
甲基转移酶类3 (METTL3) 通过调节RNA代谢,对视网膜发育至关重要. 它的表体转录功能通过m6A修饰影响视网膜前细胞分化和基因稳定性.
科学领域:
- 发展生物学 发展生物学
- 史诗转录组学 史诗转录组学
- 在RNA代谢过程中.
背景情况:
- 甲基转移酶类3 (METTL3) 是RNA代谢的关键调节剂.
- 它在组织发育,特别是视网膜中的作用尚不清楚.
- 视网膜原生细胞 (RPC) 的分化是一个复杂的过程,涉及精确的基因调节.
研究的目的:
- 研究METTL3在视网膜发育中的基因组和表皮转录功能.
- 使用3D视网膜有机体,剖析METTL3在视网膜原生细胞分化中的作用.
- 了解在视网膜发育过程中METTL3,m6A修饰和基因调节之间的相互作用.
主要方法:
- 利用胚胎干细胞衍生的3D视网膜器官来建模视网膜发育.
- 集成的多omics方法:m6A分析 (GLORI),ChIP-seq,CUT&RUN,ATAC-seq和dCas13b-FTO用于针对性的m6A工程.
- 采用了基于降解子的METTL3降解策略和蛋白质-RNA相互作用概况.
主要成果:
- 在实验室中,METTL3的丧失破坏了视网膜带的形成.
- 在Six3 3'UTR的m6A修改被发现控制了基因稳定性.
- 失去METTL3改变了组质子修饰和染色质可访问性,但直接染色质标显示出有限的转录相关性,揭示了METTL3-Ythdf1蛋白-RNA轴.
结论:
- 依赖METTL3的m6A修饰是视网膜发育中的关键表皮转录层.
- 建立了一个新的基因组范式,其中染色体可访问性可以与转录输出不同.
- 突出了表皮转录体调节在发育过程中的重要性.
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