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循环挤出机的定量成像在线解后重建相间基因组架构
Andreas Brunner1,2, Natalia RosalÍa Morero1, Wanlu Zhang1
1Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), 69117 Heidelberg, Germany.
bioRxiv : the preprint server for biology
|June 10, 2024
概括
这项研究揭示了细胞在线粒分裂后如何重组其基因组,从凝复合体过渡到凝复合体. 凝聚素-STAG1和CTCF迅速建立早期的相间基因组结构,随后是凝聚素-STAG2用于后期的紧缩.
科学领域:
- 细胞生物学 细胞生物学
- 基因组学就是基因组学.
- 分子生物学分子生物学
背景情况:
- 了解转移后的基因组重建对于细胞周期进展至关重要.
- 在基因组组织中,素和凝聚素复合物的作用是截然不同的,但它们的动态相互作用是不清楚的.
研究的目的:
- 为了阐明基因组组织建立在线索分裂后的动态过程.
- 在形成相间基因组架构时区分康登森和凝聚素复合体的时间作用.
主要方法:
- 定量和超分辨率显微镜. 定量和超分辨率显微镜.
- 在单细胞的染色体上对蛋白质复合物的时间解析映射.
- 对凝素,凝素-STAG1,凝素-STAG2和CTCF动态的分析.
主要成果:
- 观察到一个动态的,两个小时的过渡从Condensin-Cohesin基因组组织.
- 凝聚素-STAG1和CTCF在电相中迅速形成初始相间拓域 (TAD) 结构.
- 凝聚素-STAG2在G1中逐渐积累,在TAD中压缩DNA,并形成配对复合体.
- 层次循环结构从线粒体凝聚物转移到相间凝聚物.
结论:
- 由Cohesin-STAG1和CTCF启动的Cohesin复合物的顺序作用,重建了相间基因组组织.
- 这个过程用一个层次嵌套的循环系统取代了线粒体的Condensin驱动架构.
- 这项研究提供了一个详细的基因组结构建立后的基因组结构建立的时间地图.
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