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Ubiquitinated-PCNA protects replication forks from DNA2-mediated degradation by regulating Okazaki fragment maturation and chromatin assembly

Author

Listed:
  • Tanay Thakar

    (The Pennsylvania State University College of Medicine)

  • Wendy Leung

    (University of Minnesota)

  • Claudia M. Nicolae

    (The Pennsylvania State University College of Medicine)

  • Kristen E. Clements

    (The Pennsylvania State University College of Medicine)

  • Binghui Shen

    (Beckman Research Institute of City of Hope)

  • Anja-Katrin Bielinsky

    (University of Minnesota)

  • George-Lucian Moldovan

    (The Pennsylvania State University College of Medicine)

Abstract

Upon genotoxic stress, PCNA ubiquitination allows for replication of damaged DNA by recruiting lesion-bypass DNA polymerases. However, PCNA is also ubiquitinated during normal S-phase progression. By employing 293T and RPE1 cells deficient in PCNA ubiquitination, generated through CRISPR/Cas9 gene editing, here, we show that this modification promotes cellular proliferation and suppression of genomic instability under normal growth conditions. Loss of PCNA-ubiquitination results in DNA2-dependent but MRE11-independent nucleolytic degradation of nascent DNA at stalled replication forks. This degradation is linked to defective gap-filling in the wake of the replication fork and incomplete Okazaki fragment maturation, which interferes with efficient PCNA unloading by ATAD5 and subsequent nucleosome deposition by CAF-1. Moreover, concomitant loss of PCNA-ubiquitination and the BRCA pathway results in increased nascent DNA degradation and PARP inhibitor sensitivity. In conclusion, we show that by ensuring efficient Okazaki fragment maturation, PCNA-ubiquitination protects fork integrity and promotes the resistance of BRCA-deficient cells to PARP-inhibitors.

Suggested Citation

  • Tanay Thakar & Wendy Leung & Claudia M. Nicolae & Kristen E. Clements & Binghui Shen & Anja-Katrin Bielinsky & George-Lucian Moldovan, 2020. "Ubiquitinated-PCNA protects replication forks from DNA2-mediated degradation by regulating Okazaki fragment maturation and chromatin assembly," Nature Communications, Nature, vol. 11(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16096-w
    DOI: 10.1038/s41467-020-16096-w
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    Cited by:

    1. Arindam Datta & Kajal Biswas & Joshua A. Sommers & Haley Thompson & Sanket Awate & Claudia M. Nicolae & Tanay Thakar & George-Lucian Moldovan & Robert H. Shoemaker & Shyam K. Sharan & Robert M. Brosh, 2021. "WRN helicase safeguards deprotected replication forks in BRCA2-mutated cancer cells," Nature Communications, Nature, vol. 12(1), pages 1-22, December.
    2. Tanay Thakar & Ashna Dhoonmoon & Joshua Straka & Emily M. Schleicher & Claudia M. Nicolae & George-Lucian Moldovan, 2022. "Lagging strand gap suppression connects BRCA-mediated fork protection to nucleosome assembly through PCNA-dependent CAF-1 recycling," Nature Communications, Nature, vol. 13(1), pages 1-19, December.
    3. Ashna Dhoonmoon & Claudia M. Nicolae & George-Lucian Moldovan, 2022. "The KU-PARP14 axis differentially regulates DNA resection at stalled replication forks by MRE11 and EXO1," Nature Communications, Nature, vol. 13(1), pages 1-18, December.
    4. Anastasia Hale & Ashna Dhoonmoon & Joshua Straka & Claudia M. Nicolae & George-Lucian Moldovan, 2023. "Multi-step processing of replication stress-derived nascent strand DNA gaps by MRE11 and EXO1 nucleases," Nature Communications, Nature, vol. 14(1), pages 1-16, December.

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