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Selective interactions at pre-replication complexes categorize baseline and dormant origins

Author

Listed:
  • Bhushan L. Thakur

    (NIH)

  • Christophe E. Redon

    (NIH)

  • Haiqing Fu

    (NIH)

  • Robin Sebastian

    (NIH)

  • Nana A. Kusi

    (NIH)

  • Sophie Z. Zhuang

    (NIH)

  • Lorinc S. Pongor

    (NIH
    HCEMM)

  • Vilhelm A. Bohr

    (University of Copenhagen)

  • Mirit I. Aladjem

    (NIH)

Abstract

DNA synthesis in metazoans initiates within a select group of replication origins (baseline origins), whereas other (dormant) origins do not initiate replication despite recruiting apparently indistinguishable pre-replication complexes. Dormant origins are activated as backups when DNA synthesis stalls, allowing for complete genome duplication, yet it is unclear how cells selectively differentiate between baseline and dormant origins. We report here that during unperturbed cell proliferation, dormant origins selectively bind phosphorylated RecQL4 (pRecQL4), a member of the RecQ helicase family mutated in Rothmund-Thomson, RAPADILINO and Baller-Gerold syndromes. Origin-bound pRecQL4 prevents the binding of an essential replication initiation complex, MTBP-TICRR/TRESLIN, to dormant origins, thus restricting replication initiation to baseline origins. When cells encounter replication stress, pRecQL4 is required for the dissociation of the MTBP-TICRR/TRESLIN complex from chromatin, which, in turn, facilitates the subsequent redistribution of MTBP-TICRR/TRESLIN to both baseline and dormant origins and allows recovery from replication inhibition. Thus, the interactions between the MTBP-TICRR/TRESLIN complex and pRecQL4 at replication origins are critical for replication origin choice and facilitate recovery from replication stress.

Suggested Citation

  • Bhushan L. Thakur & Christophe E. Redon & Haiqing Fu & Robin Sebastian & Nana A. Kusi & Sophie Z. Zhuang & Lorinc S. Pongor & Vilhelm A. Bohr & Mirit I. Aladjem, 2025. "Selective interactions at pre-replication complexes categorize baseline and dormant origins," Nature Communications, Nature, vol. 16(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59509-4
    DOI: 10.1038/s41467-025-59509-4
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    References listed on IDEAS

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    1. Jing Zhang & Marina A. Bellani & Ryan C. James & Durga Pokharel & Yongqing Zhang & John J. Reynolds & Gavin S. McNee & Andrew P. Jackson & Grant S. Stewart & Michael M. Seidman, 2020. "DONSON and FANCM associate with different replisomes distinguished by replication timing and chromatin domain," Nature Communications, Nature, vol. 11(1), pages 1-15, December.
    2. Xiaohua Xu & Chou-Wei Chang & Min Li & Kenneth Omabe & Nhung Le & Yi-Hsuan Chen & Feng Liang & Yilun Liu, 2023. "DNA replication initiation factor RECQ4 possesses a role in antagonizing DNA replication initiation," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
    3. Anna C. Papageorgiou & Michaela Pospisilova & Jakub Cibulka & Raghib Ashraf & Christopher A. Waudby & Pavel Kadeřávek & Volha Maroz & Karel Kubicek & Zbynek Prokop & Lumir Krejci & Konstantinos Tripsi, 2023. "Recognition and coacervation of G-quadruplexes by a multifunctional disordered region in RECQ4 helicase," Nature Communications, Nature, vol. 14(1), pages 1-19, December.
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