集群CTCF边界内的面向外的位点是TAD内染色体相互作用和基因调节的关键
Xiao Ge1,2, Haiyan Huang1,2, Keqi Han1,2
1Center for Comparative Biomedicine, Ministry of Education Key Laboratory of Systems Biomedicine, State Key Laboratory of Systems Medicine for Cancer, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Institute of Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, 200240, China.
Nature communications
|December 7, 2023
概括
令人惊的是,TAD边界的面向外的CTCF结合点对于基因调节至关重要. 删除这些位点会破坏增强剂-促进剂相互作用,影响基因激活和3D基因组组织.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- CCCTC结合因子 (CTCF) 是3D基因组架构的关键调节者.
- 在建立拓关联域 (TAD) 边界方面,CTCF-binding sites (CBS) 是至关重要的.
- 在TAD边界的集群CBS元素表现出复杂的方向.
研究的目的:
- 在TAD边界的集群CTCF站点内调查面向外的CBS元素的功能作用.
- 阐明这些元素对增强剂-促进剂相互作用和基因调节的影响.
- 了解聚类CTCF站点的组织原则.
主要方法:
- 使用Pcdh和HOXD位点作为模型系统.
- 在小鼠体内进行了增强剂元素的除,在培养细胞中进行了CBS元素的除.
- 采用了染色体构造捕获 (3C) 和RNA测序 (RNA-seq) 分析.
主要成果:
- 外向的CBS元素的删除削弱了TAD内部的长距离促进剂-增强剂相互作用.
- 向外导向的CBS元素的破坏导致目标基因的增强器激活减少.
- CBS元素的定向显著影响TADs内的基因调节.
结论:
- 向外导向的CBS元素对于调解集群CTCF TAD边界的向内增强剂-促进剂相互作用至关重要.
- 这些元素在发育基因调节中起着至关重要的作用.
- 调查结果提供了对TAD内部集群CTCF站点管理的组织原则的见解.
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