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  4. Cis-regulatory effect of HPV integration is constrained by host chromatin architecture in cervical cancers
 
research article

Cis-regulatory effect of HPV integration is constrained by host chromatin architecture in cervical cancers

Singh, Anurag Kumar
•
Walavalkar, Kaivalya
•
Tavernari, Daniele  
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December 9, 2023
Molecular Oncology

Human papillomavirus (HPV) infections are the primary drivers of cervical cancers, and often HPV DNA gets integrated into the host genome. Although the oncogenic impact of HPV encoded genes is relatively well known, the cis-regulatory effect of integrated HPV DNA on host chromatin structure and gene regulation remains less understood. We investigated genome-wide patterns of HPV integrations and associated host gene expression changes in the context of host chromatin states and topologically associating domains (TADs). HPV integrations were significantly enriched in active chromatin regions and depleted in inactive ones. Interestingly, regardless of chromatin state, genomic regions flanking HPV integrations showed transcriptional upregulation. Nevertheless, upregulation (both local and long-range) was mostly confined to TADs with integration, but not affecting adjacent TADs. Few TADs showed recurrent integrations associated with overexpression of oncogenes within them (e.g. MYC, PVT1, TP63 and ERBB2) regardless of proximity. Hi-C and 4C-seq analyses in cervical cancer cell line (HeLa) demonstrated chromatin looping interactions between integrated HPV and MYC/PVT1 regions (similar to 500 kb apart), leading to allele-specific overexpression. Based on these, we propose HPV integrations can trigger multimodal oncogenic activation to promote cancer progression.

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Type
research article
DOI
10.1002/1878-0261.13559
Web of Science ID

WOS:001118059800001

Author(s)
Singh, Anurag Kumar
Walavalkar, Kaivalya
Tavernari, Daniele  
Ciriello, Giovanni
Notani, Dimple
Sabarinathan, Radhakrishnan
Date Issued

2023-12-09

Publisher

Wiley

Published in
Molecular Oncology
Subjects

Life Sciences & Biomedicine

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Cervical Cancer

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Chromatin Structure

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Gene-Regulation

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Hpv Integration

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Topologically Associating Domains

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPORICCHIO  
FunderGrant Number

Department of Atomic Energy, Government of India

Phenotypes (dbGaP) through dbGaP

DBT/Wellcome Trust India Alliance Fellowship

IA/I/20/1/504928

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Available on Infoscience
February 20, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/204539
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