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Mechanism for inverted-repeat recombination induced by a replication fork barrier

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  • Léa Marie

    (Columbia University Irving Medical Center)

  • Lorraine S. Symington

    (Columbia University Irving Medical Center
    Columbia University Irving Medical Center)

Abstract

Replication stress and abundant repetitive sequences have emerged as primary conditions underlying genomic instability in eukaryotes. To gain insight into the mechanism of recombination between repeated sequences in the context of replication stress, we used a prokaryotic Tus/Ter barrier designed to induce transient replication fork stalling near inverted repeats in the budding yeast genome. Our study reveals that the replication fork block stimulates a unique recombination pathway dependent on Rad51 strand invasion and Rad52-Rad59 strand annealing activities, Mph1/Rad5 fork remodelers, Mre11/Exo1/Dna2 resection machineries, Rad1-Rad10 nuclease and DNA polymerase δ. Furthermore, we show recombination at stalled replication forks is limited by the Srs2 helicase and Mus81-Mms4/Yen1 nucleases. Physical analysis of the replication-associated recombinants revealed that half are associated with an inversion of sequence between the repeats. Based on our extensive genetic characterization, we propose a model for recombination of closely linked repeats that can robustly generate chromosome rearrangements.

Suggested Citation

  • Léa Marie & Lorraine S. Symington, 2022. "Mechanism for inverted-repeat recombination induced by a replication fork barrier," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-021-27443-w
    DOI: 10.1038/s41467-021-27443-w
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    Cited by:

    1. Nagham Ghaddar & Yves Corda & Pierre Luciano & Martina Galli & Ylli Doksani & Vincent Géli, 2023. "The COMPASS subunit Spp1 protects nascent DNA at the Tus/Ter replication fork barrier by limiting DNA availability to nucleases," Nature Communications, Nature, vol. 14(1), pages 1-17, December.

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