Alterations in exon 4 of the p53 gene in gastric carcinoma
| Autor: | Gary DeVoe, Amy Noffsinger, Grant N. Stemmermann, Jiang Wang, Dawn Tolbert, Jonathan S. Wiest, John Emyr MacDonald, Tara Shepherd, Mary Ann Miller, Jacqueline Benedetti, Cecilia Fenoglio–Preiser |
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| Rok vydání: | 2000 |
| Předmět: |
Male
Genotype Transcription Genetic Black People Apoptosis Carcinoid Tumor Biology White People Frameshift mutation Exon Asian People Gene Frequency Stomach Neoplasms medicine Humans Point Mutation Genetic Predisposition to Disease Allele Frameshift Mutation Allele frequency Genetics Polymorphism Genetic Hepatology Point mutation Gastroenterology Exons medicine.disease Adenocarcinoma Mucinous Molecular biology Genotype frequency DNA-Binding Proteins Gene Expression Regulation Neoplastic Carcinoma Medullary Adenocarcinoma Female Tumor Suppressor Protein p53 |
| Zdroj: | Gastroenterology. 118:1039-1044 |
| ISSN: | 0016-5085 |
| Popis: | Background & Aims: Our long-term goal was to evaluate the role of p53 in the prognosis of gastric cancer. We previously showed a discrepancy between p53 expression and the presence of mutations when only exons 5-9 were examined. We then evaluated exon 4. Methods: DNA was sequenced from 217 gastric cancers to detect exon 4 alterations. Codon 72 was examined by restriction enzyme digestion. Results: Mutations were present in 3.2% of tumors. In addition, 2 polymorphic sites were found at codons 36 and 72. Polymorphisms at codon 36 were only found in 2 patients. In contrast, the codon 72 polymorphism was very frequent. The genotype frequency was arg/arg (54%), arg/pro (33%), and pro/pro (14%). The genotype of the polymorphic site varied with race ( P = 0.001): 64% of whites had the arg/arg genotype, compared with 24% of blacks. The difference in genotype by site, sex, or histological tumor type was not statistically significant ( P = 0.067). Conclusions: There are several exon 4 alterations in gastric cancers. These include the rare mutations and the very rare codon 36 polymorphism. The most common change is the codon 72 polymorphism, the genotype of which differs significantly with race. The more common arg/arg genotype in whites may explain why whites are more prone to develop cardiac cancer, whereas the more common proline allele in blacks may explain why they are more prone to develop antral cancers. Further studies are required to determine whether the codon 72 polymorphism affects patient predisposition to gastric cancer. GASTROENTEROLOGY 2000;118:1039-1044 |
| Databáze: | OpenAIRE |
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