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J Exp Med. 2018 Dec 3;215(12):3194-3212. doi: 10.1084/jem.20180520. Epub 2018 Nov 21.

HDAC stimulates gene expression through BRD4 availability in response to IFN and in interferonopathies.

Author information

1
Departments of Pathology and Microbiology and Perlmutter Cancer Center, New York University School of Medicine, New York, NY.
2
Departments of Pathology and Microbiology and Perlmutter Cancer Center, New York University School of Medicine, New York, NY david.levy@med.nyu.edu.

Abstract

In contrast to the common role of histone deacetylases (HDACs) for gene repression, HDAC activity provides a required positive function for IFN-stimulated gene (ISG) expression. Here, we show that HDAC1/2 as components of the Sin3A complex are required for ISG transcriptional elongation but not for recruitment of RNA polymerase or transcriptional initiation. Transcriptional arrest by HDAC inhibition coincides with failure to recruit the epigenetic reader Brd4 and elongation factor P-TEFb due to sequestration of Brd4 on hyperacetylated chromatin. Brd4 availability is regulated by an equilibrium cycle between opposed acetyltransferase and deacetylase activities that maintains a steady-state pool of free Brd4 available for recruitment to inducible promoters. An ISG expression signature is a hallmark of interferonopathies and other autoimmune diseases. Combined inhibition of HDAC1/2 and Brd4 resolved the aberrant ISG expression detected in cells derived from patients with two inherited interferonopathies, ISG15 and USP18 deficiencies, defining a novel therapeutic approach to ISG-associated autoimmune diseases.

PMID:
30463877
PMCID:
PMC6279398
DOI:
10.1084/jem.20180520
[Indexed for MEDLINE]
Free PMC Article

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