DNA replication stress mediates APOBEC3 family mutagenesis in breast cancer

Nnennaya Kanu, Maria Antonietta Cerone, Gerald Goh, Lykourgos Panagiotis Zalmas, Jirina Bartkova, Michelle Dietzen, Nicholas McGranahan, Rebecca Rogers, Emily K. Law, Irina Gromova, Maik Kschischo, Michael I. Walton, Olivia W. Rossanese, Jiri Bartek, Reuben S. Harris, Subramanian Venkatesan, Charles Swanton

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

Background: The APOBEC3 family of cytidine deaminases mutate the cancer genome in a range of cancer types. Although many studies have documented the downstream effects of APOBEC3 activity through next-generation sequencing, less is known about their upstream regulation. In this study, we sought to identify a molecular basis for APOBEC3 expression and activation. Results: HER2 amplification and PTEN loss promote DNA replication stress and APOBEC3B activity in vitro and correlate with APOBEC3 mutagenesis in vivo. HER2-enriched breast carcinomas display evidence of elevated levels of replication stress-associated DNA damage in vivo. Chemical and cytotoxic induction of replication stress, through aphidicolin, gemcitabine, camptothecin or hydroxyurea exposure, activates transcription of APOBEC3B via an ATR/Chk1-dependent pathway in vitro. APOBEC3B activation can be attenuated through repression of oncogenic signalling, small molecule inhibition of receptor tyrosine kinase signalling and alleviation of replication stress through nucleoside supplementation. Conclusion: These data link oncogene, loss of tumour suppressor gene and drug-induced replication stress with APOBEC3B activity, providing new insights into how cytidine deaminase-induced mutagenesis might be activated in tumourigenesis and limited therapeutically.

Original languageEnglish (US)
Article number185
JournalGenome biology
Volume17
Issue number1
DOIs
StatePublished - Sep 15 2016
Externally publishedYes

Keywords

  • APOBEC
  • Genomic instability
  • Replication stress
  • Somatic mutation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Cell Biology

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