Spatiotemporal dynamics of homologous recombination repair at single collapsed replication forks

Donna R. Whelan, Wei Ting C. Lee, Yandong Yin, Dylan M. Ofri, Keria Bermudez-Hernandez, Sarah Keegan, David Fenyo and Eli Rothenberg ()
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Donna R. Whelan: New York University School of Medicine
Wei Ting C. Lee: New York University School of Medicine
Yandong Yin: New York University School of Medicine
Dylan M. Ofri: New York University School of Medicine
Keria Bermudez-Hernandez: New York University School of Medicine
Sarah Keegan: New York University School of Medicine
David Fenyo: New York University School of Medicine
Eli Rothenberg: New York University School of Medicine

Nature Communications, 2018, vol. 9, issue 1, 1-15

Abstract: Abstract Homologous recombination (HR) is a crucial pathway for the repair of DNA double-strand breaks. BRCA1/2 breast cancer proteins are key players in HR via their mediation of RAD51 nucleofilament formation and function; however, their individual roles and crosstalk in vivo are unknown. Here we use super-resolution (SR) imaging to map the spatiotemporal kinetics of HR proteins, revealing the interdependent relationships that govern the dynamic interplay and progression of repair events. We show that initial single-stranded DNA/RAD51 nucleofilament formation is mediated by RAD52 or, in the absence of RAD52, by BRCA2. In contrast, only BRCA2 can orchestrate later RAD51 recombinase activity during homology search and resolution. Furthermore, we establish that upstream BRCA1 activity is critical for BRCA2 function. Our analyses reveal the underlying epistatic landscape of RAD51 functional dependence on RAD52, BRCA1, and BRCA2 during HR and explain the phenotypic similarity of diseases associated with mutations in these proteins.

Date: 2018
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DOI: 10.1038/s41467-018-06435-3

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