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具有跨平台Hi-C元分析的地图功能绝缘体

Wanying Xu, Jian Cui, Shanshan Zhang

bioRxiv : the preprint server for biology

|June 12, 2025

概括

功能绝缘体 (FIN) 通过动态循环形成来识别,而不仅仅是静态边界. CTCF的耗尽揭示了新的,依赖于凝聚素的增强剂-促进剂循环,激活基因,将FIN定义为真正的转录绝缘体.

科学领域:

基因组学就是基因组学.
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.

背景情况:

CTCF蛋白建立了拓关联域 (TAD) 边界.
作为转录绝缘体的TAD边界的确切作用仍在争论中.

研究的目的:

在动态循环形成和基因调节的基础上重新定义功能绝缘体 (FIN).
使用大规模数据集识别全基因组FIN及其目标基因.

主要方法:

对9个Hi-C和微C数据集的元分析.
对CTCF和凝聚蛋白耗尽对基因组架构的影响的分析.
鉴定增强剂-促进剂 (E-P) 循环和相关的基因表达变化.

主要成果:

在CTCF耗尽后新形成的E-P循环依赖于凝聚素,并与基因激活相关.
在全基因组范围内绘制了FIN,主要在euchromatin中,并且与TAD边界不同.
FINs的功能对 Wapl 耗尽和 CTCF 位移很敏感.

结论:

以动态循环形成为特征的FINs充当真正的转录绝缘体.
TAD边界并不总是作为绝缘体起作用.
动态基因组相互作用对于理解基因调节至关重要.

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