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Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay
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DNA interstrand cross-link repair requires replication-fork convergence.

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DNA interstrand cross-links (ICLs) are toxic DNA lesions. Our study shows that two converging DNA replication forks, not one, are required to initiate ICL repair, preventing genomic instability.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA interstrand cross-links (ICLs) are cytotoxic lesions that impede DNA replication and transcription.
  • The Fanconi anemia pathway is crucial for repairing ICLs in metazoans, often linked to DNA replication.
  • Existing models suggest a single replication fork collision can trigger ICL repair.

Purpose of the Study:

  • To investigate the precise requirements for initiating DNA interstrand cross-link repair during DNA replication.
  • To challenge the prevailing model that a single replication fork is sufficient for ICL repair initiation.

Main Methods:

  • Utilized Xenopus egg extracts to model DNA replication and ICL repair.
  • Manipulated replication fork convergence dynamics at ICLs to assess repair initiation.
  • Observed the behavior of the replicative CMG helicase at stalled replication forks.

Main Results:

  • Two converging DNA replication forks, not a single fork, are necessary to trigger ICL repair.
  • A single stalled replication fork prevents CMG helicase unloading, blocking repair.
  • The arrival of a second replication fork, even if delayed, can rescue stalled fork repair.

Conclusions:

  • ICL repair is initiated by a replication-induced X-shaped DNA structure formed by converging forks.
  • This requirement for converging forks ensures genomic stability during the S phase of the cell cycle.
  • The findings refine our understanding of DNA repair mechanisms and their coordination with replication.