稀少的CBX2核化了许多Polycomb蛋白质,以促进Polycomb目标基因的选择性异染色化
Steven Ingersoll1, Abby Trouth2, Xinlong Luo3
1Department of Chemistry, University of Colorado Denver, Denver, CO 80217-3364, USA.
bioRxiv : the preprint server for biology
|February 19, 2024
概括
低丰富度的CBX2蛋白质核聚抑制复合体 (PRC) 凝聚物,控制可选的异色素蛋白形成和细胞分化. 这项研究揭示了通过液-液相分离 (LLPS) 调节异色素的新机制.
科学领域:
- 表观遗传学和基因调控
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
背景情况:
- 聚抑制复合体 (PRC) 1和2的选择性异色色素化对发育至关重要,但其分子基础尚不清楚.
- 液-液相分离 (LLPS) 越来越被认为是组织细胞组件的机制,包括染色体调节器.
研究的目的:
- 阐明液-液相分离 (LLPS) 在选择性异色素蛋白形成中的作用.
- 为了研究CBX2在核聚镇压复合体和调节基因表达中的功能.
主要方法:
- 基因工程和分子生物学技术.
- 活细胞单分子成像,以量化缩物中的蛋白质数量.
- 分析波利科姆镇压复合体 (PRC) 1和2动态和H3K27me3沉积的分析.
主要成果:
- 大约3个CBX2蛋白质核化了众多的PRC1和PRC2子单元,通过LLPS在小鼠胚胎干细胞 (mESC) 中形成非静态度凝聚物.
- 稀少的CBX2控制了选择性的异染色蛋白边界,H3K27me3沉积,转录和细胞分化.
- CBX2的LLPS对于H3K27me3的划界和沉积至关重要,影响了分化.
结论:
- 发现了一种新的机制,即通过LLPS,低丰度蛋白质通过LLPS核化大型蛋白质复合体.
- 证明了CBX2驱动的LLPS在选择性异色素蛋白形成中的关键作用及其对差异化的影响.
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