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Defects in the origin licensing checkpoint stresses cells exiting G0
1Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dundee, UK j.j.blow@dundee.ac.uk.
The Journal of Cell Biology
|July 4, 2019
Summary
The licensing checkpoint normally prevents full DNA replication origin licensing in late G1. However, this checkpoint is inactive when cells exit G0, leading to incomplete licensing and replicative stress.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- DNA replication origin licensing is a critical cell cycle process.
- The licensing checkpoint in late G1 normally ensures complete origin licensing.
Purpose of the Study:
- To investigate the licensing of replication origins in cells exiting the G0 phase.
- To determine the role of the licensing checkpoint during G0 exit.
Main Methods:
- Analysis of cell cycle progression.
- Investigation of DNA replication origin licensing.
- Examination of checkpoint activity.
Main Results:
- The licensing checkpoint is inoperative in cells exiting from G0.
- This leads to incomplete licensing of replication origins.
- Incomplete licensing results in replicative stress.
Conclusions:
- The licensing checkpoint's function is compromised during G0 exit.
- This compromise results in aberrant origin licensing and cellular stress.
- Understanding this process is crucial for cell cycle regulation and preventing genomic instability.
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