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Updated: Oct 17, 2025
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
At a Crossroads to Cancer: How p53-Induced Cell Fate Decisions Secure Genome Integrity
Dario Rizzotto1, Lukas Englmaier1,2, Andreas Villunger1,2,3
1CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, 1090 Vienna, Austria.
Abstract:
P53 is known as the most critical tumor suppressor and is often referred to as the guardian of our genome. More than 40 years after its discovery, we are still struggling to understand all molecular details on how this transcription factor prevents oncogenesis or how to leverage current knowledge about its function to improve cancer treatment. Multiple cues, including DNA-damage or mitotic errors, can lead to the stabilization and nuclear translocation of p53, initiating the expression of multiple target genes. These transcriptional programs may be cell-type- and stimulus-specific, as is their outcome that ultimately imposes a barrier to cellular transformation. Cell cycle arrest and cell death are two well-studied consequences of p53 activation, but, while being considered critical, they do not fully explain the consequences of p53 loss-of-function phenotypes in cancer. Here, we discuss how mitotic errors alert the p53 network and give an overview of multiple ways that p53 can trigger cell death. We argue that a comparative analysis of different types of p53 responses, elicited by different triggers in a time-resolved manner in well-defined model systems, is critical to understand the cell-type-specific cell fate induced by p53 upon its activation in order to resolve the remaining mystery of its tumor-suppressive function.
Insights
The tumor suppressor p53 (also known as the guardian of the genome) prevents cancer. Understanding its complex responses to DNA damage and mitotic errors is crucial for improving cancer therapies.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- The p53 protein is a critical tumor suppressor, vital for preventing oncogenesis.
- Despite decades of research, the complete molecular mechanisms of p53's tumor-suppressive functions remain incompletely understood.
- p53 activation, triggered by various cellular stresses, leads to specific transcriptional programs influencing cell fate.
Purpose of the Study:
- To explore how mitotic errors activate the p53 network.
- To provide an overview of p53-mediated cell death pathways.
- To emphasize the need for comparative analyses of p53 responses for a comprehensive understanding of its tumor-suppressive role.
Main Methods:
- Literature review and discussion of existing research on p53.
- Analysis of p53's role in response to mitotic errors.
- Exploration of p53-induced cell death mechanisms.
Main Results:
- Mitotic errors are significant triggers for p53 network activation.
- p53 employs multiple distinct pathways to induce cell death.
- p53's tumor-suppressive function is linked to cell-type-specific responses.
Conclusions:
- A deeper understanding of p53's diverse responses to various triggers is essential.
- Comparative, time-resolved analyses in defined model systems are critical for deciphering p53's cell-fate determination.
- Resolving the remaining mysteries of p53's function will enhance cancer treatment strategies.
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