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DNA damage, oncogenesis and the p53 tumour-suppressor gene
J M Lee1, J L Abrahamson, A Bernstein
1Division of Molecular and Developmental Biology, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ont., Canada.
Abstract:
The p53 tumour-suppressor gene encodes a transcription factor which plays a central role in controlling oncogenic development in mouse and humans. Mice which over-express mutant p53 transgenes or have a homozygous deletion of the p53 gene show a high frequency of spontaneous tumour development. This review will focus on recent developments using these transgenic and null mice which suggest that p53 is important in maintaining genomic stability, and is a critical component in the cellular response to ionizing radiation.
Insights
The p53 tumor-suppressor gene is crucial for preventing cancer. Studies using genetically modified mice reveal its role in maintaining genomic stability and responding to radiation.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- The p53 gene acts as a tumor suppressor, critical for controlling cancer development in both mice and humans.
- Mice with altered p53 genes (overexpressing mutants or homozygous deletions) exhibit a high incidence of spontaneous tumors.
Purpose of the Study:
- To review recent findings on the role of p53 in maintaining genomic stability.
- To highlight p53's function in the cellular response to ionizing radiation.
Main Methods:
- Utilizing transgenic mouse models that over-express mutant p53.
- Employing null mice with a homozygous deletion of the p53 gene.
Main Results:
- Evidence suggests p53 plays a vital role in preserving the integrity of the genome.
- p53 is identified as a key factor in cellular defense mechanisms against ionizing radiation damage.
Conclusions:
- The p53 gene is essential for preventing oncogenic development and maintaining genomic stability.
- p53 is a critical mediator of cellular responses to DNA damage induced by ionizing radiation.