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BET inhibition disrupts transcription but retains enhancer-promoter contact.

Abstract：

:Enhancers are DNA sequences that enable complex temporal and tissue-specific regulation of genes in higher eukaryotes. Although it is not entirely clear how enhancer-promoter interactions can increase gene expression, this proximity has been observed in multiple systems at multiple loci and is thought to be essential for the maintenance of gene expression. Bromodomain and Extra-Terminal domain (BET) and Mediator proteins have been shown capable of forming phase condensates and are thought to be essential for super-enhancer function. Here, we show that targeting of cells with inhibitors of BET proteins or pharmacological degradation of BET protein Bromodomain-containing protein 4 (BRD4) has a strong impact on transcription but very little impact on enhancer-promoter interactions. Dissolving phase condensates reduces BRD4 and Mediator binding at enhancers and can also strongly affect gene transcription, without disrupting enhancer-promoter interactions. These results suggest that activation of transcription and maintenance of enhancer-promoter interactions are separable events. Our findings further indicate that enhancer-promoter interactions are not dependent on high levels of BRD4 and Mediator, and are likely maintained by a complex set of factors including additional activator complexes and, at some sites, CTCF and cohesin.

journal_name

Nat Commun

journal_title

Nature communications

authors

Crump NT,Ballabio E,Godfrey L,Thorne R,Repapi E,Kerry J,Tapia M,Hua P,Lagerholm C,Filippakopoulos P,Davies JOJ,Milne TA

doi

10.1038/s41467-020-20400-z

subject

Has Abstract

pub_date

2021-01-11 00:00:00

pages

223

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20400-z

journal_volume

12

pub_type

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