Chromatin dysregulation and DNA methylation at transcription start sites associated with transcriptional repression in cancers.

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/E

SUBMITTER: Ando M 

PROVIDER: S-EPMC6522544 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature