Abstract
AIM: To explore relationship of codon 1493, 1367 and 1328 mutations in mutation cluster region (MCR) of exon 15 of Adenomatous polyposis coli (APC) gene in cases of colorectal neoplasm with the family history.
METHODS: The specimens were prepared for DNA extraction from 21 colorectal adenoma specimens, 16 colorectal carcinoma, 20 healthy germline groups with positive familial history and 8 healthy germline groups without family history. Then MCR of APC gene exon 15 were specifically amplified and sequenced by ABI3100 Genetic Analyzer, and the codon mutations were statistically analyzed among the 4 groups and variation genotypes, and then tested with Chi-square.
RESULTS: The codon mutations of APC MCR from total samples were three variations: 1493(ACG>ACA), 63/69(91.3%); 1367(CAG>TAG), 1/69(1.4%) and 1328(CAG>TAG), 5/69(7.2%)Four genotypes such as 4478 (G→A), 4478 (G/A), 4096 (C/T) and 3979 (C/T) were found out. Significant differences (P < 0.05) were noted between the adenoma group and non-family history group on the analysis of 4478 (G→A) and (G/A), also noted between family history group and no family history group on the analysis of 4478 (G→A). The significant differences (P < 0.05) in pathogenic mutant phenotypes were involved between 4478 (G→A) with 4478 (G/A), 4096 (C/T) and 3979 (C/T), respectively, also between 4478 (G/A) with 4096 (C/T) and 3979 (C/T), but not between 4096 (C/T) and 3979 (C/T).
CONCLUSION: The most frequently present 4478 (G→A) of 1493 (ACG>ACA) is the phenotype of positive history group and adenoma group. In researches, APC MCR codon 1367 and 1328 genotyping are significantly present only in somatic cells of the colorectal cancergenetic phenotypes.
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