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

Bhushan L Thakur1, Christophe E Redon1, Haiqing Fu1

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Summary
This summary is machine-generated.

Phosphorylated RecQL4 (pRecQL4) distinguishes active from dormant DNA replication origins in metazoans. pRecQL4 prevents early initiation at dormant origins, ensuring genome stability and facilitating replication stress recovery.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA replication in metazoans initiates from specific baseline origins.
  • Dormant origins are typically inactive but can be activated during replication stress.
  • The mechanism distinguishing baseline from dormant origins remains unclear.

Purpose of the Study:

  • To elucidate the mechanism controlling replication origin selection in metazoans.
  • To investigate the role of RecQL4 in regulating DNA replication initiation.
  • To understand how cells recover from replication stress.

Main Methods:

  • Investigated protein-DNA interactions at replication origins.
  • Utilized biochemical assays to study protein complex formation.
  • Analyzed the role of phosphorylated RecQL4 (pRecQL4) in origin regulation.

Main Results:

  • Dormant origins selectively bind pRecQL4 during normal cell proliferation.
  • pRecQL4 inhibits the binding of the MTBP-TICRR/TRESLIN complex to dormant origins.
  • pRecQL4 facilitates MTBP-TICRR/TRESLIN dissociation during replication stress, enabling origin activation and recovery.

Conclusions:

  • pRecQL4 is a key regulator of replication origin choice in metazoans.
  • The interaction between pRecQL4 and MTBP-TICRR/TRESLIN is crucial for both origin selection and replication stress response.
  • This mechanism ensures efficient and accurate genome duplication.