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Replication dynamics of recombination-dependent replication forks.

Karel Naiman1, Eduard Campillo-Funollet2, Adam T Watson2

  • 1Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, UK. k.naiman@sussex.ac.uk.

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|February 11, 2021
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Summary
This summary is machine-generated.

Homologous recombination (HR)-restarted replication forks use DNA Polymerase delta (Pol δ) for extensive synthesis on both strands, bypassing canonical replication polymerases. This process allows forks to overcome replication barriers, with lagging strand gaps filled later by Pol δ.

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Area of Science:

  • Molecular Biology
  • Genetics
  • DNA Replication

Background:

  • Replication forks restarted by homologous recombination (HR) are known to be error-prone.
  • Understanding the polymerase dynamics during HR restart is crucial for comprehending genome stability.

Purpose of the Study:

  • To visualize and characterize the in vivo replication dynamics of HR-restarted forks at a specific replication barrier (RTS1) in S. pombe.
  • To elucidate the roles of different DNA polymerases (Pol δ, Pol ε, Pol α) in synthesizing DNA during HR restart.
  • To investigate the progression of HR-restarted forks through replication fork barriers and the impact of lagging strand resection.

Main Methods:

  • Polymerase usage sequencing to visualize in vivo replication dynamics.
  • Monte Carlo simulations to model replication processes.
  • Genetic manipulation (deletion of pku70) to alter lagging strand resection during HR restart.

Main Results:

  • HR-restarted forks synthesize both DNA strands using Pol δ for extended distances (up to 30 kb) without switching to a Pol δ/Pol ε configuration.
  • DNA Polymerase α (Pol α) is not significantly utilized on either strand during HR restart, suggesting a gap-filling mechanism by Pol δ on the lagging strand.
  • HR-restarted forks can progress through replication fork barriers that arrest canonical replication forks.
  • Altering lagging strand resection impacts HR restart, but the leading strand initiation site remains stable, indicating the robustness of the 3' single strand.

Conclusions:

  • HR-restarted forks exhibit a distinct polymerase usage pattern, primarily relying on Pol δ for extensive synthesis on both leading and lagging strands.
  • These forks are capable of navigating challenging DNA structures like fork barriers, contributing to genome integrity.
  • Lagging strand resection plays a role in HR restart, but the fundamental process of leading strand initiation remains stable, highlighting the resilience of the replication machinery.