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The Mechanism of Replication Stalling and Recovery within Repetitive DNA

View ORCID ProfileCorella S Casas-Delucchi, View ORCID ProfileManuel Daza-Martin, View ORCID ProfileSophie L Williams, View ORCID ProfileGideon Coster
doi: https://doi.org/10.1101/2021.06.02.446729
Corella S Casas-Delucchi
Genome Replication lab, Division of Cancer Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK
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  • ORCID record for Corella S Casas-Delucchi
Manuel Daza-Martin
Genome Replication lab, Division of Cancer Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK
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Sophie L Williams
Genome Replication lab, Division of Cancer Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK
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Gideon Coster
Genome Replication lab, Division of Cancer Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK
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  • For correspondence: Gideon.coster@icr.ac.uk
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SUMMARY

Accurate chromosomal DNA replication is essential to maintain genomic stability. Genetic evidence suggests that certain repetitive sequences impair replication, yet the underlying mechanism is poorly defined. Replication could be directly inhibited by the DNA template or indirectly, for example by DNA-bound proteins. Here, we reconstituted replication of mono-, di- and trinucleotide repeats in vitro using eukaryotic replisomes assembled from purified proteins. We found that structure-prone repeats are sufficient to impair replication. Whilst template unwinding was unaffected, leading strand synthesis was inhibited, leading to fork uncoupling. Synthesis through hairpin-forming repeats relied on replisome-intrinsic mechanisms, whereas synthesis of quadruplex-forming repeats required an extrinsic accessory helicase. DNA-induced fork stalling was mechanistically similar to that induced by leading strand DNA lesions, highlighting structure-prone repeats as an important potential source of replication stress. Thus, we propose that our understanding of the cellular response to replication stress also applies to stalling induced by repetitive sequences.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted June 02, 2021.
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The Mechanism of Replication Stalling and Recovery within Repetitive DNA
Corella S Casas-Delucchi, Manuel Daza-Martin, Sophie L Williams, Gideon Coster
bioRxiv 2021.06.02.446729; doi: https://doi.org/10.1101/2021.06.02.446729
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The Mechanism of Replication Stalling and Recovery within Repetitive DNA
Corella S Casas-Delucchi, Manuel Daza-Martin, Sophie L Williams, Gideon Coster
bioRxiv 2021.06.02.446729; doi: https://doi.org/10.1101/2021.06.02.446729

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