Abstract
BRCA1 and the DNA helicase FANCJ (also known as BACH1 or BRIP1) have common functions in breast cancer suppression and DNA repair. However, the functional significance of the direct interaction between BRCA1 and FANCJ remains unclear. Here, we have discovered that BRCA1 binding to FANCJ regulates DNA damage repair choice. Thus, when FANCJ binding to BRCA1 is ablated, the molecular mechanism chosen for the repair of damaged DNA is dramatically altered. Specifically, a FANCJ protein that cannot be phosphorylated at serine 990 or bind BRCA1 inhibits DNA repair via homologous recombination and promotes polη-dependent bypass. Furthermore, the polη-dependent bypass promoted by FANCJ requires the direct binding to the mismatch repair (MMR) protein, MLH1. Together, our findings implicate that in human cells BRCA1 binding to FANCJ is critical to regulate DNA repair choice and promote genomic stability. Moreover, unregulated FANCJ function could be associated with cancer and/or chemoresistance.
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Acknowledgements
We thank Larry Thompson, Alan Lehmann, and Roger Greenberg for critical comments. We also thank Maria Jasin for the DR-U2OS cells and Alan Lehmann for the XPV-vector and polη-complemented lines as well as polη-GFP construct, Hans Joenje for FA-J cells, and Claire Baldwin for readership comments. This study was supported by NIH R01 CA129514-01A1 and from charitable contributions from Mr and Mrs Edward T Vitone Jr.
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Xie, J., Litman, R., Wang, S. et al. Targeting the FANCJ–BRCA1 interaction promotes a switch from recombination to polη-dependent bypass. Oncogene 29, 2499–2508 (2010). https://doi.org/10.1038/onc.2010.18
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DOI: https://doi.org/10.1038/onc.2010.18
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