Abstract
DNA double-strand break repair allows cells to survive both exogenous and endogenous insults to the genome. In yeast, the recombinases Rad51 and Rad52 are central to multiple forms of homology-dependent repair. Classically, Rad51 and Rad52 are thought to act cooperatively, with formation of the functional Rad51 nucleofilament facilitated by the mediator function of Rad52. Several studies have now identified functions for the interaction between Rad51 and Rad52 that are independent of the mediator function of Rad52 and affect a seemingly diverse array of functions in de novo telomere addition, global chromosome mobility following DNA damage, Rad51 nucleofilament stability, checkpoint adaptation, and microhomology-mediated chromosome rearrangements. Here, we review these functions with an emphasis on our recent discovery that the Rad51–Rad52 interaction influences the probability of de novo telomere addition at sites preferentially targeted by telomerase following a double-strand break (DSB). We present data addressing the prevalence of sites within the yeast genome that are capable of stimulating de novo telomere addition following a DSB and speculate about the potential role such sites may play in genome stability.
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Data summarized in Fig. 1 are provided in supplementary Table S1.
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Acknowledgements
We thank Sara Conwell and Blake Conwell for technical assistance. Many thanks to Dr. James Haber for gifts of strains and plasmids and for insightful comments on the manuscript.
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This work is supported by National Institutes of Health award R01GM123292 to KLF.
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KLF wrote the manuscript; KN and EAE contributed to the writing and ideas expressed in the manuscript; KN generated the data.
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Communicated by M. Kupiec.
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Ngo, K., Epum, E.A. & Friedman, K.L. Emerging non-canonical roles for the Rad51–Rad52 interaction in response to double-strand breaks in yeast. Curr Genet 66, 917–926 (2020). https://doi.org/10.1007/s00294-020-01081-z
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DOI: https://doi.org/10.1007/s00294-020-01081-z