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Mechanism of cell cycle disruption by multiple p53 pulses
Kazunari Iwamoto1, Hiroyuki Hamada, Masahiro Okamoto
1Laboratory for Bioinformatics, Graduate School of Systems Life Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan. kazunari-i@brs.kyushu-u.ac.jp
Genome Informatics. International Conference on Genome Informatics
|January 11, 2012
Summary
The tumor suppressor gene p53
Area of Science:
- Molecular Biology
- Cell Biology
- Systems Biology
Background:
- The tumor suppressor gene p53 plays a critical role in cellular response to DNA damage, regulating cell fate.
- Recent observations revealed p53 oscillation in MCF7 cells, but its biological significance remained unclear.
Purpose of the Study:
- To investigate the relationship between p53 oscillation and cell cycle progression using a novel mathematical model.
- To elucidate the biological meaning of p53 oscillation in the context of DNA damage and cell cycle regulation.
Main Methods:
- Construction of a mathematical model integrating the cell cycle regulatory system and p53 signaling network.
- Simulations were performed under conditions with and without DNA damage to analyze p53 dynamics and cell cycle progression.
Main Results:
- Simulations without DNA damage aligned with existing biological findings.
- Simulations with DNA damage demonstrated p53 oscillation and cell cycle arrest, indicating that multiple p53 pulses disrupt cell cycle progression.
- Cell cycle disruption was attributed to M phase catastrophe, caused by decreased cyclin A/cyclin-dependent kinase 2 levels.
Conclusions:
- The generation of multiple p53 pulses in response to DNA damage is linked to cell cycle disruption.
- p53 oscillation may serve as a potential biomarker for cell cycle disruption following DNA damage.
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