Chromatin dysregulation and DNA methylation at transcription start sites associated with transcriptional repression in cancers.
Nat Commun
; 10(1): 2188, 2019 05 16.
Article
em En
| MEDLINE
| ID: mdl-31097695
ABSTRACT
Although promoter-associated CpG islands have been established as targets of DNA methylation changes in cancer, previous studies suggest that epigenetic dysregulation outside the promoter region may be more closely associated with transcriptional changes. Here we examine DNA methylation, chromatin marks, and transcriptional alterations to define the relationship between transcriptional modulation and spatial changes in chromatin structure. Using human papillomavirus-related oropharyngeal carcinoma as a model, we show aberrant enrichment of repressive H3K9me3 at the transcriptional start site (TSS) with methylation-associated, tumor-specific gene silencing. Further analysis identifies a hypermethylated subtype which shows a functional convergence on MYC targets and association with CREBBP/EP300 mutation. The tumor-specific shift to transcriptional repression associated with DNA methylation at TSSs was confirmed in multiple tumor types. Our data may show a common underlying epigenetic dysregulation in cancer associated with broad enrichment of repressive chromatin marks and aberrant DNA hypermethylation at TSSs in combination with MYC network activation.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Cromatina
/
Regulação Neoplásica da Expressão Gênica
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Metilação de DNA
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Sítio de Iniciação de Transcrição
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Neoplasias
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article