Detection of aberrations of 17p and p53 gene in gastrointestinal cancers by dual (two-color) fluorescence in situ hybridization and GeneChip p53 assay
| Autor: | Teruo Eguchi, Koichi Ishikawa, Satoshi Asai, Toshihito Nagata, Yasuo Takahashi, Masashi Fujii, Yukimoto Ishii, Kaori Shintaku |
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| Rok vydání: | 2000 |
| Předmět: |
Cancer Research
Centromere Gene Dosage Biology medicine.disease_cause Exon Stomach Neoplasms Genetics medicine Humans Point Mutation Molecular Biology Gene In Situ Hybridization Fluorescence Fluorescent Dyes Oligonucleotide Array Sequence Analysis Chromosome Aberrations Mutation medicine.diagnostic_test Point mutation medicine.disease Genes p53 Primary tumor Chromosome 17 (human) Colonic Neoplasms Cancer research Carcinogenesis Fluorescence in situ hybridization Chromosomes Human Pair 17 |
| Zdroj: | Cancer genetics and cytogenetics. 121(1) |
| ISSN: | 0165-4608 |
| Popis: | We performed dual (two-color) fluorescence in situ hybridization (FISH) using direct fluorescent labeling probes for p53 and chromosome 17 in six gastrointestinal (3 stomach and 3 colon) cancers. In three of these (1 stomach and 2 colon) the interphase cell nuclei showed an imbalance of signals for the p53 and chromosome 17; that is, the p53 signal count was lower than the chromosome 17 signal count, indicating deletion of the p53 gene. Moreover, metaphase FISH analysis demonstrated that those nuclei actually had a chromosome 17 with deletion of the p53 gene. Interestingly, these three cases had an abnormal chromosome 17 copy number, that is, chromosome 17 aneusomy. Furthermore, to investigate the possibility of p53 mutation in tumors with an imbalance of signals for chromosome 17 and p53 per nucleus, we performed a GeneChip p53 assay which has recently been developed. GeneChip p53 assay demonstrated that a primary tumor sample from one colon cancer case had a heterozygous point mutation of CGT (Arg) to CAT (His) at codon 273 in exon 8. In addition, a sample of metastatic tumor in the liver from the same case revealed two heterozygous point mutations. One of them was the same mutation as that is the primary tumor; the other was GTG (Val) to GGG (Gly) at codon 217 in exon 6. In conclusion, we found that the combination of dual-color FISH and GeneChip p53 assay offered reliable results and important information concerning not only deletion of the p53 gene and chromosome 17 aneusomy but also p53 mutations. Using these techniques, we demonstrated that an imbalance of signals for chromosome 17 and p53 per nucleus, chromosome 17 aneusomy, and accumulation of p53 mutations had occurred during carcinogenesis and development of gastrointestinal cancers. |
| Databáze: | OpenAIRE |
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