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"Super p53" mice exhibit enhanced DNA damage response, are tumor resistant and age normally
Isabel García-Cao1, Marta García-Cao, Juan Martín-Caballero
1Spanish National Center of Biotechnology, Department of Immunology and Oncology, Campus de Cantoblanco, Madrid E-28049, Spain.
Abstract:
The tumor suppressor p53 is critical in preventing cancer due to its ability to trigger proliferation arrest and cell death upon the occurrence of a variety of stresses, most notably, DNA damage and oncogenic stress. Here, we report the generation and characterization of mice carrying supernumerary copies of the p53 gene in the form of large genomic transgenes. Prior to this, we demonstrate that the p53 transgenic allele (p53-tg), when present in a p53-null genetic background, behaves as a functional replica of the endogenous gene. "Super p53" mice, carrying p53-tg alleles in addition to the two endogenous alleles, exhibit an enhanced response to DNA damage. Importantly, "super p53" mice are significantly protected from cancer when compared with normal mice. Finally, in contrast to previously reported mice with constitutively active p53, "super p53" mice do not show any indication of premature aging, probably reflecting the fact that p53 is under normal regulatory control. Together, our results prove that cancer resistance can be enhanced by a simple genetic modification and in the absence of undesirable effects.
Insights
Increasing tumor suppressor p53 gene copies in mice enhances cancer resistance. These "super p53" mice show improved DNA damage response and protection from cancer without premature aging.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- The tumor suppressor p53 is crucial for preventing cancer by inducing cell cycle arrest and apoptosis in response to cellular stress.
- Understanding p53's role is vital for developing novel cancer therapies.
Purpose of the Study:
- To generate and characterize mice with extra copies of the p53 gene to investigate its impact on cancer resistance.
- To assess the functional activity and potential side effects of increased p53 levels.
Main Methods:
- Generation of transgenic mice carrying supernumerary copies of the p53 gene (p53-tg).
- Validation of the p53-tg allele's functionality in a p53-null background.
- Characterization of "super p53" mice (possessing both endogenous and transgenic p53 alleles) for DNA damage response, cancer susceptibility, and aging phenotypes.
Main Results:
- The p53-tg allele functionally replicates the endogenous p53 gene.
- "Super p53" mice exhibit an enhanced response to DNA damage.
- These mice demonstrate significant protection against cancer compared to normal mice without signs of premature aging.
Conclusions:
- Enhancing p53 gene dosage is a viable strategy to increase cancer resistance.
- This genetic modification confers cancer protection without detrimental effects like premature aging.
- The findings support the potential of modulating p53 levels for cancer prevention.