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The role of p53-target genes in human cancer
1Laboratory of Molecular Medicine, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Japan. tokino@sapmed.ac.jp
Abstract:
The tumor suppressor gene p53 is mutated in a large proportion of human cancers. In some cellular conditions like DNA damage, the p53 gene is induced and its gene product is posttranscriptionally activated. p53 works as a transcriptional activator and induces the expression of its downstream target genes. This review will explain why expression of the normal p53 gene leads to tumor growth suppression. The p53 has several biological effects involving cell-cycle arrest, DNA replication and repair, proliferation, apoptosis, angiogenesis inhibition, and cellular stress response. These effects of the p53 result mainly from the activation of expression of a large number of p53-target genes. Here we have focused on the biological functions of the transcriptional targets of p53.
Insights
The tumor suppressor gene p53, crucial for preventing cancer, acts as a transcriptional activator. Its normal function suppresses tumor growth by regulating target genes involved in cell cycle arrest, DNA repair, and apoptosis.
Area of Science:
- Molecular Biology
- Cancer Biology
- Genetics
Background:
- The p53 tumor suppressor gene is frequently mutated in human cancers.
- p53 plays a critical role in cellular responses to DNA damage and stress.
- p53 functions as a transcriptional activator, regulating downstream target genes.
Purpose of the Study:
- To elucidate the mechanisms by which normal p53 gene expression suppresses tumor growth.
- To review the biological functions mediated by the transcriptional targets of p53.
Main Methods:
- Literature review focusing on the functions of p53 transcriptional targets.
- Analysis of p53's role in cellular processes like cell-cycle arrest, DNA repair, apoptosis, and angiogenesis inhibition.
Main Results:
- Normal p53 gene expression leads to tumor growth suppression through various biological effects.
- p53 regulates key cellular processes including cell-cycle arrest, DNA replication and repair, proliferation, apoptosis, and angiogenesis inhibition.
- The diverse biological effects of p53 are primarily mediated by the activation of its numerous target genes.
Conclusions:
- The transcriptional targets of p53 are central to its tumor-suppressive functions.
- Understanding p53's target genes is essential for comprehending its role in cancer prevention and therapy.