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Updated: May 10, 2026
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
DNA polymerase κ-dependent DNA synthesis at stalled replication forks is important for CHK1 activation
Rémy Bétous1, Marie-Jeanne Pillaire, Laura Pierini
1Equipe Labellisée La Ligue Contre le Cancer 2013, INSERM UMR 1037, CNRS ERL 505294, CRCT (Cancer Research Center of Toulouse), Toulouse, France.
The EMBO Journal
|June 27, 2013
Summary
DNA polymerase kappa (Pol κ) is crucial for preventing genomic instability by aiding DNA repair at stalled replication forks. This translesion synthesis polymerase helps recruit checkpoint proteins, ensuring cell survival and proliferation.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Replication stress triggers checkpoint signaling, involving ATR and Chk1, to prevent genomic instability.
- Primed single-stranded DNA at stalled forks is a key signal for checkpoint activation.
Purpose of the Study:
- To investigate the role of DNA polymerase kappa (Pol κ) in the replication checkpoint response and recovery from replication stress.
- To elucidate the mechanism by which Pol κ contributes to genomic stability.
Main Methods:
- siRNA-mediated depletion in human cells.
- Immunodepletion and reconstitution experiments in Xenopus egg extracts.
- Analysis of DNA intermediate synthesis and protein-protein interactions.
Main Results:
- Pol κ is required for recovery after replication stress.
- Pol κ synthesizes short DNA intermediates at stalled forks, facilitating 9-1-1 clamp recruitment.
- Pol κ interacts with the Rad9 subunit of the 9-1-1 complex.
Conclusions:
- Pol κ has a novel checkpoint function essential for replication stress response.
- This function of Pol κ is vital for maintaining genomic stability and cell proliferation even under normal conditions.
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