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Updated: May 27, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Modeling the basal dynamics of p53 system.
Tingzhe Sun1, Weiwei Yang, Jing Liu
1State Key Laboratory of Pharmaceutical Biotechnology, Department of Life Sciences, Nanjing University, Nanjing, Jiangsu Province, People's Republic of China.
The p53 protein exhibits spontaneous, asynchronous pulses even without stress, triggered by an excitable mechanism. Cells only respond robustly to severe DNA damage, advancing p53 therapy insights.
Area of Science:
- Cellular dynamics
- Molecular biology
- Cancer research
Background:
- The tumor suppressor p53 is crucial for cellular stress responses like apoptosis.
- Previous models often overlooked p53 dynamics under non-stressed conditions.
Purpose of the Study:
- To investigate the basal dynamics of p53 under non-stressed conditions.
- To explore the mechanisms triggering p53 pulses and cellular responsiveness.
Main Methods:
- Developed a stochastic delay model incorporating two negative feedback loops.
- Analyzed p53 protein distribution and pulse generation under varying stress levels.
Main Results:
- Under non-stressed conditions, p53 shows skewed distribution with spontaneous, asynchronous pulses driven by basal DNA breaks.
- These pulses are initiated by an excitable mechanism and filtered by posttranslational modifications.
- Severe DNA damage induces synchronous p53 pulses and high p21 transcription.
Conclusions:
- p53 dynamics under non-stressed conditions involve an excitable mechanism with spontaneous pulses.
- Cells exhibit full responsiveness primarily upon severe DNA damage.
- Findings enhance understanding of p53 pulse mechanisms and offer p53-based therapy opportunities.
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