微分区形成的动力学在线粒分裂到G1的过渡期
Viraat Y Goel1,2,3, Nicholas G Aboreden4,5, James M Jusuf1,2,3
1Department of Biological Engineering, Massachusetts Institute of Technology; Cambridge, MA 02139, USA.
bioRxiv : the preprint server for biology
|September 30, 2024
概括
在细胞分裂过程中,不同的基因组结构称为微分区形成和加强. 这些结构是由染色体紧缩驱动的,可能解释了线粒分裂后的快速基因激活.
科学领域:
- 基因组学就是基因组学.
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 跨相3D基因组架构,包括A/B区,TAD和CTCF循环,在线粒分裂过程中会丢失.
- 传统的Hi-C方法对更细的结构,如微分区和Cis-regulatory element (CRE) 相互作用不敏感.
研究的目的:
- 通过使用高分辨率的Micro-C.来调查线粒体退出期间3D基因组结构的存在和动态.
- 了解微分区,大规模基因组组织和染色质重塑因素之间的关系.
主要方法:
- 区域捕获Micro-C被应用于从线粒分裂过渡到G1的细胞.
- 凝耗尽被用来评估循环挤出的作用.
- 用聚合物建模来模拟微分区的形成.
主要成果:
- 预期不到的微分区在 prometaphase 中被观察到,在 ana/telophase 中得到加强,在 G1. 1 中逐渐减弱.
- 凝耗尽不同影响微分区和A/B分区,表明部分独立性.
- 聚合物建模支持染色质紧缩有利于微分区形成,而循环挤出不利于它.
结论:
- 微分区通过cis-regulatory element (CRE) 的同型亲和力内在形成,这种亲和力受益于在Ana/telophase期间的染色质紧缩.
- 这些发现表明,在线粒体退出时发生过渡性转录升的机制.
- 微分区和A/B分区的独特形成机制突出显示了3D基因组组织的新方面.
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