Rev-erbα dynamically modulates chromatin looping to control circadian gene transcription.

Rev-erbα dynamically modulates chromatin looping to control circadian gene transcription.
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Rev-ERBα动态调节染色质环,以控制昼夜节律转录。

DOI:
10.1126/science.aao6891
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发表时间:
2018-03-16
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lazar MA
Lazar MA
中科院分区:
其他
文献类型:
--
作者:
Kim YH;Marhon SA;Zhang Y;Steger DJ;Won KJ;Lazar MA

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哺乳动物生理学表现出24小时的周期性,这是由于基因表达的昼夜节律由构成分子钟的转录因子(TF)控制。核心时钟TF在增强子序列处与基因组结合以调节昼夜节律基因表达,但并非所有结合位点都具有相同的功能。在这里,我们证明了小鼠肝脏中的昼夜节律基因表达是由增强子和启动子之间有节奏的染色质相互作用控制的。Rev-erbα是时钟的核心抑制因子,通过募集NCoR-HDAC 3辅阻遏物复合物、组蛋白脱乙酰化以及驱逐延伸因子BRD 4和成环因子MED 1,对抗Rev-erbα调节的增强子和昼夜节律靶基因启动子之间的功能环形成。因此,分子钟的抑制臂通过有节奏地调节染色质环来控制昼夜基因转录。
Mammalian physiology exhibits 24-hour cyclicity due to circadian rhythms of gene expression controlled by transcription factors (TF) that comprise molecular clocks. Core clock TFs bind to the genome at enhancer sequences to regulate circadian gene expression, but not all binding sites are equally functional. Here we demonstrate that circadian gene expression in mouse liver is controlled by rhythmic chromatin interactions between enhancers and promoters. Rev-erbα, a core repressive TF of the clock, opposes functional loop formation between Rev-erbα-regulated enhancers and circadian target gene promoters by recruitment of the NCoR-HDAC3 corepressor complex, histone deacetylation, and eviction of the elongation factor BRD4 and the looping factor MED1. Thus, a repressive arm of the molecular clock operates by rhythmically modulating chromatin loops to control circadian gene transcription.
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