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Chromatin dynamics and DNA replication roadblocks
Ian Hammond-Martel1, Alain Verreault2, Hugo Wurtele3
1Centre de recherche de l'Hôpital Maisonneuve-Rosemont, 5415 boulevard de l'Assomption, Montreal, H1T 2M4, Canada.
DNA Repair
|June 4, 2021
Summary
DNA damage response involves dynamic chromatin changes during replication. Histone recycling and de novo assembly ensure DNA replication fork progression and influence DNA repair pathways.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- DNA lesions stall replication forks, triggering DNA damage responses.
- Dynamic chromatin structure changes are crucial for replication completion during S-phase.
Purpose of the Study:
- To describe parental histone segregation and de novo chromatin assembly.
- To illustrate how these chromatin processes impact cellular responses to replication roadblocks.
Main Methods:
- This review synthesizes existing literature on chromatin dynamics during DNA replication and repair.
- Focuses on the mechanisms of histone recycling and de novo chromatin assembly.
Main Results:
- Parental histone segregation involves transferring existing histones to nascent DNA.
- De novo chromatin assembly involves depositing new histones onto nascent DNA.
- Both processes occur genome-wide at all replication forks.
Conclusions:
- Parental histone segregation and de novo chromatin assembly are fundamental to replication fork progression.
- These chromatin dynamics significantly influence DNA repair and damage tolerance mechanisms.
- Understanding these processes is key to comprehending cellular responses to DNA replication stress.
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