tandemly integrated hpv16 can form a brd4-dependent super-enhancer-like element that drives transcription of viral oncogenes

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ID: 197272
2016
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Abstract
In cancer cells associated with human papillomavirus (HPV) infections, the viral genome is very often found integrated into the cellular genome. The viral oncogenes E6 and E7 are transcribed from the viral promoter, and integration events that alter transcriptional regulation of this promoter contribute to carcinogenic progression. In this study, we detected highly enriched binding of the super-enhancer markers Brd4, MED1, and H3K27ac, visible as a prominent nuclear focus by immunofluorescence, at the tandemly integrated copies of HPV16 in cells of the cervical neoplasia cell line W12 subclone 20861. Tumor cells are often addicted to super-enhancer-driven oncogenes and are particularly sensitive to disruption of transcription factor binding to the enhancers. Treatment of 20861 cells with bromodomain inhibitors displaced Brd4 from the HPV integration site, greatly decreased E6/E7 transcription, and inhibited cellular proliferation. Thus, Brd4 activates viral transcription at this integration site, and strong selection for E6/E7 expression can drive the formation of a super-enhancer-like element to promote oncogenesis.
Reference Key
dooley2016mbiotandemly Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Katharine E. Dooley;Alix Warburton;Alison A. McBride
Journal synlett
Year 2016
DOI
10.1128/mBio.01446-16
URL
http://mbio.asm.org/cgi/content/full/7/5/e01446-16
Keywords
Microbiology

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