DNA replication stress mediates APOBEC3 family mutagenesis in breast cancer. Issue 1 (December 2016)

• Record Type: Journal Article
• Authors: Kanu, Nnennaya; Cerone, Maria; Goh, Gerald; Zalmas, Lykourgos-Panagiotis; Bartkova, Jirina; Dietzen, Michelle; McGranahan, Nicholas; Rogers, Rebecca; Law, Emily; Gromova, Irina; Kschischo, Maik; Walton, Michael; Rossanese, Olivia; Bartek, Jiri; Harris, Reuben; Venkatesan, Subramanian; Swanton, Charles
• Is Part Of: Genome biology. Volume 17:Issue 1(2016)
• Page Start: 1
• Page End: 15
• Publication Date: 2016-12
• Subjects: APOBEC -- Genomic instability -- Replication stress -- Somatic mutation; Genomes -- Periodicals; Biology -- Periodicals; Molecular biology -- Periodicals; 572.8633
• DOI: 10.1186/s13059-016-1042-9
• Languages: English
• ISSNs: 1474-760X

Abstract

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 andPTEN loss promote DNA replication stress and APOBEC3B activityin vitro and correlate with APOBEC3 mutagenesisin vivo . HER2-enriched breast carcinomas display evidence of elevated levels of replication stress-associated DNA damagein vivo . Chemical and cytotoxic induction of replication stress, through aphidicolin, gemcitabine, camptothecin or hydroxyurea exposure, activates transcription ofAPOBEC3B via an ATR/Chk1-dependent pathwayin 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.