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Related Experiment Video

Updated: Nov 6, 2025

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SMARCAD1-mediated active replication fork stability maintains genome integrity.

Calvin Shun Yu Lo1, Marvin van Toorn1,2, Vincent Gaggioli1

  • 1Department of Molecular Genetics, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA Rotterdam, Netherlands.

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Summary

A new mechanism involving SMARCAD1 protein stabilizes replication forks, preventing DNA damage. This finding is crucial for understanding genome stability and cancer resistance.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Replication fork stability is crucial for genome integrity.
  • Breast cancer 1/2 (BRCA1/2) proteins mediate a known stalled fork protection pathway.
  • Additional mechanisms for maintaining replication fork stability remain largely unknown.

Purpose of the Study:

  • To identify novel mechanisms that maintain replication fork stability.
  • To investigate the role of SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily-A containing DEAD/H box-1 (SMARCAD1) in replication fork stabilization.
  • To understand how SMARCAD1 contributes to resistance against replication poisons.

Main Methods:

  • Investigated the function of SMARCAD1 in maintaining replication fork stability.
  • Assessed the impact of SMARCAD1 on 53BP1 accumulation and its interaction with PCNA.
  • Utilized genetic approaches to study SMARCAD1, 53BP1, ATAD5, and BRCA1 interactions in the context of replication stress.

Main Results:

  • SMARCAD1 stabilizes active replication forks, essential for resistance to replication poisons.
  • SMARCAD1 prevents toxic enrichment of 53BP1 at replication forks by inhibiting 53BP1-associated nucleosome accumulation.
  • Loss of SMARCAD1 leads to 53BP1-mediated PCNA dissociation, causing fork stalling and DNA damage, which can be rescued by loss of 53BP1 and requires BRCA1.

Conclusions:

  • SMARCAD1 represents a novel mechanism for active replication fork stabilization.
  • SMARCAD1 plays a critical role in preventing replication stress-induced genome instability.
  • SMARCAD1-mediated fork stabilization is essential for proliferation in BRCA1-deficient tumors under fork protection challenges.