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透性TAD边界及其对基因组相关功能的影响

Li-Hsin Chang^1,2, Daan Noordermeer³

¹MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.

BioEssays : news and reviews in molecular, cellular and developmental biology

|August 2, 2024

概括

由CTCF和Cohesin调节的TAD边界控制着DNA循环. 集群的CTCF站点阻断了Cohesin,限制了TAD间的循环和基因组相互作用.

科学领域:

基因组学和分子生物学
染色体形状捕获 (3C) 技术
表观遗传学和基因调控

背景情况:

拓关联域 (TAD) 边界通过抑制Cohesin介导的DNA循环来分离基因组区域.
CTCF结合点是TAD边界的关键组成部分,与Cohesin相互作用以阻止循环挤出.
TAD边界表现出部分透性,允许一些TAD间循环形成.

研究的目的:

提出一个模型来解释TAD边界透性的机制.
调查聚类CTCF结合点在调节TAD边界上的凝聚力学动态中的作用.
探索TAD边界调节对增强剂-促进剂相互作用和其他基因组过程的影响.

主要方法:

重新分析纳米-C数据,一种高分辨率的染色体形状捕获技术.
计算建模模拟在TAD边界上的Cohesin行为.
对DNA序列组织和CTCF结合位点集群的分析.

主要成果:

提出了一个模型,其中集群的CTCF位点导致Cohesin与染色质的顺序停滞和分离.
凝聚素的一小部分成功地穿过TAD边界,促进了TAD间循环的形成.
跨TAD循环的最大长度受到全基因组一致性解离率的约束.

结论:

在TAD边界内的CTCF停滞点的组织决定了它们的透性.
这种机制影响增强剂-促进剂循环形成和整体基因组组织.
了解TAD边界调节对于理解各种基因组过程至关重要.

关键词:

3D基因组组织 3D基因组组织在CTCF中,CTCF是指CTCF.凝聚力在凝聚力中在拓上关联域名.增强者促进者循环循环基因调节基因调节基因调节循环挤出循环的挤出.

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