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Increased replication initiation and conflicts with transcription underlie Cyclin E-induced replication stress.
R M Jones1, O Mortusewicz, I Afzal
1School of Cancer Sciences, College of Medical and Dental Sciences, Institute for Biomedical Research, University of Birmingham, Birmingham, UK.
Oncogene
|September 5, 2012
Summary
Oncogenes like Cyclin E cause DNA damage by increasing replication origins and disrupting replication-transcription. This replication stress activates tumor barriers but can also promote cancer mutations.
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- Oncogenes drive aberrant cell growth and can induce DNA damage at replication forks, activating tumor suppressors like ATM/p53.
- Cyclin E overexpression is a known oncogenic event implicated in various cancers.
Purpose of the Study:
- To investigate the molecular mechanisms underlying oncogene-induced replication stress, specifically in cells overexpressing Cyclin E.
- To elucidate how Cyclin E contributes to DNA damage and activates cellular responses.
Main Methods:
- Studied Cyclin E overexpression in cellular models.
- Analyzed replication origin firing, replication fork progression, and DNA damage.
- Utilized inhibition of replication initiation factors to dissect causal relationships.
Main Results:
- Cyclin E overexpression leads to increased replication origin firing, impaired replication fork progression, and DNA damage.
- Replication slowing and DNA damage induced by Cyclin E are direct consequences of excessive origin firing.
- Replication-transcription interference significantly contributes to Cyclin E-induced replication slowing and homologous recombination activation.
Conclusions:
- Oncogene-induced replication stress, exemplified by Cyclin E, stems from deregulated replication initiation and heightened replication-transcription interference.
- This stress impairs replication fork progression, activating tumor suppressors but also potentially driving cancer-promoting mutations.
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