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Published on: January 14, 2016
Histone deposition promotes recombination-dependent replication at arrested forks
Julien Hardy1,2,3, Dingli Dai1,2,3, Anissia Ait Saada1,2,3
1Institut Curie, PSL Research University, UMR3348, Orsay, France.
Histone deposition, facilitated by CAF-1 and Asf1, aids Recombination-Dependent Replication (RDR) by stabilizing DNA joint-molecules. This process, occurring downstream of Rad52, enhances cell survival under replication stress.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Replication stress threatens genome stability.
- Recombination-Dependent Replication (RDR) restarts stalled DNA synthesis.
- The link between RDR and chromatin assembly is poorly understood.
Purpose of the Study:
- To investigate the role of histone deposition in RDR.
- To elucidate the contribution of CAF-1 and Asf1 to RDR.
Main Methods:
- Utilized a H3-H113D mutant histone to disrupt replication-dependent chromatin assembly.
- Assessed the impact of histone deposition on RDR using fission yeast.
- Investigated the interaction between Rad52, CAF-1, and Rqh1.
Main Results:
- DNA synthesis-dependent histone deposition by CAF-1 and Asf1 promotes RDR by inhibiting Rqh1-mediated disassembly of joint-molecules.
- Rad52 facilitates CAF-1 binding to recombination sites, positioning histone deposition downstream of Rad52.
- Histone deposition and Rqh1 activity synergize to confer resistance to camptothecin.
- Histone deposition stabilizes spontaneous recombination intermediates independently of Rqh1.
Conclusions:
- Histone deposition actively promotes RDR.
- This stabilization of joint-molecules by histone deposition, while beneficial for replication restart, may pose risks to genome stability.
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