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Genotyping Possible Polymorphic Variants of Human Mismatch Repair Genes in Healthy Korean Individuals and Sporadic Colorectal Cancer Patients

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Abstract

The genotypic consequences of numerous single-nucleotide variants in human mismatch repair genes are mostly undetermined. We examined 27 reported single-nucleotide variants, rarely or ambiguously verified in a population-based study, to identify single-nucleotide polymorphisms (SNPs), haplotypes, and the genotype–phenotype association in Korean populations of 330 healthy individuals, 107 sporadic colorectal cancer patients, and 107 of their first-degree relatives. Real-time PCR 5′-nuclease assays (TaqMan® MGB assay) were used to determine 24 single-nucleotide variants, and restriction fragment length polymorphism (RFLP) assays were used to determine 3 variants. Of these 27 variants, 4 (hMSH2 gIVS12-6, hMLH1 655, hMLH1 1151, and hMSH2 1168, in descending order) were identified as SNPs occurring in 4.5 to 53.1% of healthy individuals, with polymorphism levels of 0.023–0.3 (mean, 0.092). East Asian populations had an ethnic predilection for the hMLH1 1151 SNP. The genotype distribution for all four SNPs showed no association with sporadic colorectal cancer. Twenty-three variants were not identified in the Korean population, suggesting that fifteen of these variants are colorectal cancer-related mutations and eight are SNPs. Two haplotype patterns existed exclusively, but with rare frequency, in sporadic colorectal cancer patients. The hMLH1 655 allele was closely correlated with hMLH1 protein expression (P= 0.02), but none of the four SNPs was associated with clinicopathologic variables. Among the 27 single nucleotide variants of mismatch repair genes, 12 were suggestive of nonfunctional SNPs and 15 may be colorectal cancer-related mutations. Further verification in other ethnic groups may provide the genotypic and phenotypic significance of single nucleotide variants found in mismatch repair genes.

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Authors and Affiliations

  1. Department of Surgery, University of Ulsan College of Medicine, and Laboratory of Cancer Biology & Genetics, Asan Institute for Life Sciences, 388-1 Poongnap-2-Dong Songpa-Ku, Seoul, 138-736, Korea. Tel:

    Jin C. Kim, Seon A. Roh, Kum H. Koo, In H. Ka, Hee C. Kim, Chang S. Yu & Kang H. Lee

  2. Department of Pathology, University of Ulsan College of Medicine, Seoul, Korea

    Jung S. Kim

  3. Department of Surgery, Catholic University of Daegu, Daegu, Korea

    Han I. Lee

  4. Cancer and Immunogenetics Laboratory, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK

    Walter F. Bodmer

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  1. Jin C. Kim
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Kim, J.C., Roh, S.A., Koo, K.H. et al. Genotyping Possible Polymorphic Variants of Human Mismatch Repair Genes in Healthy Korean Individuals and Sporadic Colorectal Cancer Patients. Familial Cancer 3, 129–137 (2004). https://doi.org/10.1023/B:FAME.0000039919.66461.8f

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