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H3K9/14Ac in TC-797 genome

ABSTRACT: The goal is to localize "active" histone marks known to bind BRD4-NUT in the NMC genome. Characterization of the reference epigenome in humans by use of ChIP-Seq in the TC-797 human NMC cell line.

ORGANISM(S): Homo sapiens

PROVIDER: GSE36512 | GEO | 2013/03/05

SECONDARY ACCESSION(S): PRJNA153465

REPOSITORIES: GEO

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H3K9/14Ac in TC-797 genome

Project description:The goal is to localize "active" histone marks known to bind BRD4-NUT in the NMC genome. Characterization of the reference epigenome in humans by use of ChIP-Seq in the TC-797 human NMC cell line. ChIP-seq of untreated TC-797 cells using H3K9/14Ac antibodies versus IgG control.

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Project description:To investigate the mechanism that drives dramatic mistargeting of active chromatin in NUT-midline carcinoma, we have identified protein interactions unique to the BRD4-NUT fusion oncoprotein compared to wild type BRD4. Using crosslinking, affinity purification, and mass spectrometry, we identify the p300 acetyltransferase as ectopically associated with BRD4 through the NUT fusion in both NMC and non-NMC cell types. We also identify ZNF532 among a number of candidates uniquely associated with BRD4-NUT in NMC patient cells but not present in 293T cells. p300 and ZNF532 are both implicated in feed-forward regulatory loops leading to propagation of the oncogenic regulatory complex in BRD4-NUT patient cells. Extending our biochemical findings, we independently identified a novel ZNF532-NUT translocation fusion in a newly diagnosed NMC patient. ChIP-seq of key players: NUT, ZNF532, BRD4, p300, and anti-H3K27ac, reveals the formation of ZNF532-NUT-associated hyperacetylated megadomains, distinctly localized, but otherwise analogous to those found in BRD4-NUT patient cells. Our results support a model in which NMC is caused by a cascade of misregulation that is initiated by ectopic protein-protein interactions on chromatin between NUT and several distinct, but interacting, components of BRD4 regulatory complexes.

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