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Gene duplication and deletion caused by over-replication at a fork barrier

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  • Judith Oehler

    (University of Oxford)

  • Carl A. Morrow

    (University of Oxford)

  • Matthew C. Whitby

    (University of Oxford)

Abstract

Replication fork stalling can provoke fork reversal to form a four-way DNA junction. This remodelling of the replication fork can facilitate repair, aid bypass of DNA lesions, and enable replication restart, but may also pose a risk of over-replication during fork convergence. We show that replication fork stalling at a site-specific barrier in fission yeast can induce gene duplication-deletion rearrangements that are independent of replication restart-associated template switching and Rad51-dependent multi-invasion. Instead, they resemble targeted gene replacements (TGRs), requiring the DNA annealing activity of Rad52, the 3’-flap nuclease Rad16-Swi10, and mismatch repair protein Msh2. We propose that excess DNA, generated during the merging of a canonical fork with a reversed fork, can be liberated by a nuclease and integrated at an ectopic site via a TGR-like mechanism. This highlights how over-replication at replication termination sites can threaten genome stability in eukaryotes.

Suggested Citation

  • Judith Oehler & Carl A. Morrow & Matthew C. Whitby, 2023. "Gene duplication and deletion caused by over-replication at a fork barrier," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43494-7
    DOI: 10.1038/s41467-023-43494-7
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    References listed on IDEAS

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