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Cellular Responses to Widespread DNA Replication Stress
Jac A Nickoloff1, Aruna S Jaiswal2, Neelam Sharma1
1Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO 80523, USA.
International Journal of Molecular Sciences
|December 9, 2023
Summary
DNA replication stress, caused by damage or difficult sequences, triggers cell responses to maintain genome stability. Nucleases are key to repairing stressed replication forks, offering cancer treatment insights.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Replicative DNA polymerases encounter various DNA damages, leading to replication stress that compromises genome stability.
- Replication stress arises from DNA damage, nucleotide pool imbalances, polymerase inhibitors, and challenging DNA structures like G-quadruplexes.
- Cellular responses to replication stress involve cell cycle arrest, fork collapse, DNA repair, and apoptosis, with specific nucleases playing critical roles.
Purpose of the Study:
- To review cellular responses to widespread replication stress, including damage, polymerase inhibition, nucleotide depletion, and R-loops.
- To highlight the role of nucleases in resolving stalled replication forks and maintaining genome integrity.
- To discuss the implications of replication stress responses for cancer biology and therapeutic strategies.
Main Methods:
- Literature review of cellular responses to replication stress.
- Focus on the functions of various nucleases (e.g., MUS81, EEPD1, TATDN2) in DNA repair and replication restart.
- Discussion of oncogenic stress in cancer and its link to replication stress response pathways.
Main Results:
- Nucleases like EEPD1 and TATDN2 are crucial for restarting stressed replication forks and mitigating specific types of replication stress.
- Dysregulation of replication stress responses in cancer cells contributes to genome instability and cancer progression.
- Several nucleases cleave branched DNA structures at stressed forks, facilitating repair and restart.
Conclusions:
- Cellular responses to replication stress are vital for genome stability, involving a complex network of repair pathways.
- Insights into replication stress mechanisms, particularly the roles of nucleases, offer potential for novel cancer therapies targeting synthetic lethality.
- Understanding oncogenic stress and its interaction with replication stress pathways is crucial for cancer treatment development.
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