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Polycomb-mediated 3D-genome organization controls replication timing
DOI:10.1126/sciadv.adx7445.png)
摘要
En 中文
Polycomb(PcG)体是由多梳蛋白复合物形成的核焦点,包含PcG结合的DNA,并参与发育和分化过程中的基因调控,尽管其精确分子功能尚不清楚。利用酪胺信号放大测序,我们提供了与PcG体相关的基因组区域的全面视图,包括特定的着丝粒和端粒位点。这些区域富集了抑制性标记H3K27me3和H3K9me3,缺乏活性标记H3K4me3,并表现出低染色质可及性。我们发现PcG体周围有高密度的复制起点,这与复制因子起始识别复合物相关蛋白(ORCA)/LRWD1定位于这些位点一致。ORCA与多梳抑制复合物相互作用,稳定H3K27甲基转移酶,并促进H3K27me3在特定染色质位点上的沉积。ORCA的缺失影响PcG体周围的染色质组织,导致重复区域的去压缩,并增强复制起点的启动。我们的结果表明,ORCA与PcG结合的染色质相关联,以维持一个抑制性环境,该环境调节复制起点启动的时间。
期刊
IF:
12.5
论文数:
2.0W
被引数:
18.1W
机构
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