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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Tumor suppressor gene p53 mutations in human prostate cancer
1Department of Urology, Yokohama City University, School of Medicine, Japan.
Abstract:
The genetic background underlying the growth and development of human prostatic cancer is not yet clear. Here we searched for possible mutations in the entire coding region of tumor suppressor gene p53 in primary human prostatic carcinomas, using polymerase chain reaction and single-strand conformational polymorphism analysis of RNA. We found p53 gene mutations in 4 of 21 cases (19%). DNA sequencing of the polymerase chain reaction products revealed missense point mutations that resulted in amino acid changes in exon 5 or 3 in three cases and single base deletions in exon 7 in two cases. One case contained both a missense point mutation and a single base deletion. Three of these four cases were pathologically diagnosed as poorly differentiated adenocarcinomas, and three of the four cases were clinically localized to stage C or D. None of seven noncancerous prostate tissues nor three well-differentiated adenocarcinoma tissues showed any mutations. The present results suggest that p53 gene mutation is involved in the late progression steps of human prostate carcinogenesis.
Insights
Mutations in the p53 tumor suppressor gene were found in 19% of human prostate cancer cases. These p53 gene mutations appear to be associated with advanced prostate cancer progression.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- The genetic factors influencing human prostate cancer development remain largely unknown.
- Understanding these factors is crucial for targeted therapies and improved patient outcomes.
Purpose of the Study:
- To investigate mutations in the p53 tumor suppressor gene within primary human prostate carcinomas.
- To determine the potential role of p53 gene mutations in prostate cancer progression.
Main Methods:
- Analysis of the entire coding region of the p53 gene using polymerase chain reaction (PCR) and single-strand conformational polymorphism (SSCP) analysis of RNA.
- DNA sequencing of PCR products to identify specific mutations.
Main Results:
- Mutations in the p53 gene were detected in 4 out of 21 (19%) primary prostate cancer cases.
- Identified mutations included missense point mutations and single base deletions in various exons of the p53 gene.
- None of the noncancerous prostate tissues or well-differentiated adenocarcinoma tissues exhibited p53 gene mutations.
- p53 mutations were more prevalent in poorly differentiated and advanced-stage (C/D) prostate cancers.
Conclusions:
- The findings suggest that p53 gene mutations are implicated in the later stages of human prostate cancer development.
- p53 alterations may serve as a biomarker for advanced or aggressive prostate cancer.
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