Coactivator condensation at super-enhancers links phase separation and gene control.

Coactivator condensation at super-enhancers links phase separation and gene control.
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DOI:
10.1126/science.aar3958
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发表时间:
2018-07-27
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Young RA
Young RA
中科院分区:
其他
文献类型:
--
作者:
Sabari BR;Dall'Agnese A;Boija A;Klein IA;Coffey EL;Shrinivas K;Abraham BJ;Hannett NM;Zamudio AV;Manteiga JC;Li CH;Guo YE;Day DS;Schuijers J;Vasile E;Malik S;Hnisz D;Lee TI;Cisse II;Roeder RG;Sharp PA;Chakraborty AK;Young RA

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超级增强子(SE)是增强子簇,它们协作组装高密度的转录装置,以驱动在细胞身份中发挥重要作用的基因的稳健表达。在这里,我们证明富含 SE 的转录共激活因子 BRD4 和 MED1 在 SE 处形成核点,这些点表现出液体状凝结物的特性,并被扰乱凝结物的化学物质破坏。 BRD4 和 MED1 的本质无序区域 (IDR) 可以形成相分离的液滴,MED1-IDR 液滴可以分隔和浓缩核提取物中的转录装置。这些结果支持这样的观点,即共激活剂在 SE 处形成相分离的凝聚物,从而分隔和集中转录装置,表明共激活剂 IDR 在此过程中的作用,并提供了对关键细胞识别基因控制所涉及机制的见解。
Super-enhancers (SEs) are clusters of enhancers that cooperatively assemble a high density of transcriptional apparatus to drive robust expression of genes with prominent roles in cell identity. Here, we demonstrate that the SE-enriched transcriptional coactivators BRD4 and MED1 form nuclear puncta at SEs that exhibit properties of liquid-like condensates and are disrupted by chemicals that perturb condensates. The intrinsically disordered regions (IDRs) of BRD4 and MED1 can form phase-separated droplets and MED1-IDR droplets can compartmentalize and concentrate transcription apparatus from nuclear extracts. These results support the idea that coactivators form phase-separated condensates at SEs that compartmentalize and concentrate the transcription apparatus, suggest a role for coactivator IDRs in this process, and offer insights into mechanisms involved in control of key cell identity genes.
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