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[Detection mutations in the DNA mismatch repair genes of hMLH1 and hMSH2 genes in Colombian families with suspicion of hereditary non-polyposis colorectal carcinoma (Lynch syndrome)].
Biomedica. 2005 Sep; 25(3):315-24.B

Abstract

INTRODUCTION

Colorectal cancer (CRC) is the second highest cause of cancer mortality in developed countries. In Colombia, CRC ranks fifth as a cause of cancer death. Approximately 75% of CRC appear to be spontaneous and 25% are familial, with 5% of the latter clearly hereditary. Of these, hereditary non-polyposis colorectal carcinoma (HNPCC)-or Lynch syndrome is the most important.

OBJECTIVE

Herein, the two most important genes involved in Lynch syndrome, the hMLH1 and hMSH2 were analyzed for presence of mutations.

MATERIALS AND METHODS

Seventeen Colombian families that fulfilled the Amsterdam II criteria or Bethesda guidelines for Lynch syndrome were selected. The of 35 exons of hMLH1 and hMSH2 genes were screened by SSCP and those with electrophoretic variants were sequenced.

RESULTS

Eight germinal mutations were detected, corresponding to a 47% detection mutation rate. Six of the eight mutations have previously been reported. These consisted of the following mutations: a single base substitution at the donor splicing site of exon 9, a single base substitution (A>G) at codon 755 of the exon 17, and another single base substitution (G>A) at codon 681 of exon 18. The two novel mutations consisted of a single base substitution (C>T) at codon 640 of exon 17 of the hMLH1 gene and a two-nucleotide deletion (TG) at codon 184 of exon 3 of hMSH2 gene. In addition, two families were observed with a polymorphism in the intron 13 (G>A) nt 1558+14, of hMLH1 gene.

CONCLUSIONS

This study represented the first survey for detecting mutations associated with Lynch syndrome in Colombia, and is intended to lead to the establishment of a management and prevention program.

Authors+Show Affiliations

Facultad de Medicina e Instituto de Genética, Universidad Nacional de Colombia, Bogotá, D. C., Colombia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

spa

PubMed ID

16276679

Citation

Gómez, Andrea, et al. "[Detection Mutations in the DNA Mismatch Repair Genes of hMLH1 and hMSH2 Genes in Colombian Families With Suspicion of Hereditary Non-polyposis Colorectal Carcinoma (Lynch Syndrome)]." Biomedica : Revista Del Instituto Nacional De Salud, vol. 25, no. 3, 2005, pp. 315-24.
Gómez A, Salguero G, García H, et al. [Detection mutations in the DNA mismatch repair genes of hMLH1 and hMSH2 genes in Colombian families with suspicion of hereditary non-polyposis colorectal carcinoma (Lynch syndrome)]. Biomedica. 2005;25(3):315-24.
Gómez, A., Salguero, G., García, H., Aristizábal, F., Gutiérrez, O., Angel, L. A., Padrón, J., Martínez, C., Martínez, H., Malaver, O., Barvo, R., & Giraldo, A. (2005). [Detection mutations in the DNA mismatch repair genes of hMLH1 and hMSH2 genes in Colombian families with suspicion of hereditary non-polyposis colorectal carcinoma (Lynch syndrome)]. Biomedica : Revista Del Instituto Nacional De Salud, 25(3), 315-24.
Gómez A, et al. [Detection Mutations in the DNA Mismatch Repair Genes of hMLH1 and hMSH2 Genes in Colombian Families With Suspicion of Hereditary Non-polyposis Colorectal Carcinoma (Lynch Syndrome)]. Biomedica. 2005;25(3):315-24. PubMed PMID: 16276679.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Detection mutations in the DNA mismatch repair genes of hMLH1 and hMSH2 genes in Colombian families with suspicion of hereditary non-polyposis colorectal carcinoma (Lynch syndrome)]. AU - Gómez,Andrea, AU - Salguero,Gustavo, AU - García,Herbert, AU - Aristizábal,Fabio, AU - Gutiérrez,Oscar, AU - Angel,Luis Alberto, AU - Padrón,Jorge, AU - Martínez,Carlos, AU - Martínez,Humberto, AU - Malaver,Omar, AU - Barvo,Rosa, AU - Giraldo,Alejandro, PY - 2005/11/10/pubmed PY - 2005/12/22/medline PY - 2005/11/10/entrez SP - 315 EP - 24 JF - Biomedica : revista del Instituto Nacional de Salud JO - Biomedica VL - 25 IS - 3 N2 - INTRODUCTION: Colorectal cancer (CRC) is the second highest cause of cancer mortality in developed countries. In Colombia, CRC ranks fifth as a cause of cancer death. Approximately 75% of CRC appear to be spontaneous and 25% are familial, with 5% of the latter clearly hereditary. Of these, hereditary non-polyposis colorectal carcinoma (HNPCC)-or Lynch syndrome is the most important. OBJECTIVE: Herein, the two most important genes involved in Lynch syndrome, the hMLH1 and hMSH2 were analyzed for presence of mutations. MATERIALS AND METHODS: Seventeen Colombian families that fulfilled the Amsterdam II criteria or Bethesda guidelines for Lynch syndrome were selected. The of 35 exons of hMLH1 and hMSH2 genes were screened by SSCP and those with electrophoretic variants were sequenced. RESULTS: Eight germinal mutations were detected, corresponding to a 47% detection mutation rate. Six of the eight mutations have previously been reported. These consisted of the following mutations: a single base substitution at the donor splicing site of exon 9, a single base substitution (A>G) at codon 755 of the exon 17, and another single base substitution (G>A) at codon 681 of exon 18. The two novel mutations consisted of a single base substitution (C>T) at codon 640 of exon 17 of the hMLH1 gene and a two-nucleotide deletion (TG) at codon 184 of exon 3 of hMSH2 gene. In addition, two families were observed with a polymorphism in the intron 13 (G>A) nt 1558+14, of hMLH1 gene. CONCLUSIONS: This study represented the first survey for detecting mutations associated with Lynch syndrome in Colombia, and is intended to lead to the establishment of a management and prevention program. SN - 0120-4157 UR - https://www.unboundmedicine.com/medline/citation/16276679/[Detection_mutations_in_the_DNA_mismatch_repair_genes_of_hMLH1_and_hMSH2_genes_in_Colombian_families_with_suspicion_of_hereditary_non_polyposis_colorectal_carcinoma__Lynch_syndrome_]_ L2 - http://www.diseaseinfosearch.org/result/3371 DB - PRIME DP - Unbound Medicine ER -