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Presymptomatic diagnosis using a deletion of a single codon in families with hereditary non-polyposis colorectal cancer.
Mutat Res. 2005 Feb 15; 570(1):89-96.MR

Abstract

The diagnosis of hereditary non-polyposis colorectal cancer (HNPCC) is often confirmed by a mutation in one of several mismatch-repair genes, in particular MLH1, MSH2 and MSH6. Presymptomatic diagnosis requires the identification of a mutation causing the disease. Three different deletions of a single amino acid codon have previously been published as assumed pathogenic. The objective of this study was to determine if an MSH2 3 base pair in-frame deletion (N596del) could be used in presymptomatic screening of at-risk individuals. We report on five HNPCC families with the N596del mutation, identified after mutation screening of MSH2 and MLH1. All patients in the families were haplotyped using markers flanking the MSH2 gene. The haplotypes revealed that the five families with high probability descended from only two founders. The N596del segregated with the HNPCC phenotype with lod scores of 3.2 and 2.0 at the recombination fraction of 0.0 in the two founder families. Sequencing of MSH2 and MLH1 did not reveal other pathogenic mutations, and N596del was not identified in 50 healthy controls. The mutation has previously been found expressed in mRNA, and is located in a conserved domain. The results support the hypothesis that N596del is the disease causing mutation and not a clinically silent variation. On this basis, the application of the MSH2 N596del mutation, in presymptomatic screening of HNPCC families, is recommended.

Authors+Show Affiliations

Department of Clinical Genetics, Copenhagen University Hospital, H:S Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen O, Denmark. ripa@rh.dkNo 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

Language

eng

PubMed ID

15680406

Citation

Ripa, Rasmus S., et al. "Presymptomatic Diagnosis Using a Deletion of a Single Codon in Families With Hereditary Non-polyposis Colorectal Cancer." Mutation Research, vol. 570, no. 1, 2005, pp. 89-96.
Ripa RS, Katballe N, Wikman FP, et al. Presymptomatic diagnosis using a deletion of a single codon in families with hereditary non-polyposis colorectal cancer. Mutat Res. 2005;570(1):89-96.
Ripa, R. S., Katballe, N., Wikman, F. P., Jäger, A. C., Bernstein, I., Orntoft, T., Schwartz, M., Nielsen, F. C., & Bisgaard, M. L. (2005). Presymptomatic diagnosis using a deletion of a single codon in families with hereditary non-polyposis colorectal cancer. Mutation Research, 570(1), 89-96.
Ripa RS, et al. Presymptomatic Diagnosis Using a Deletion of a Single Codon in Families With Hereditary Non-polyposis Colorectal Cancer. Mutat Res. 2005 Feb 15;570(1):89-96. PubMed PMID: 15680406.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Presymptomatic diagnosis using a deletion of a single codon in families with hereditary non-polyposis colorectal cancer. AU - Ripa,Rasmus S, AU - Katballe,Niels, AU - Wikman,Friedrik P, AU - Jäger,Anne Charlotte, AU - Bernstein,Inge, AU - Orntoft,Torben, AU - Schwartz,Marianne, AU - Nielsen,Finn Cilius, AU - Bisgaard,Marie Luise, PY - 2004/07/14/received PY - 2004/10/06/revised PY - 2004/10/14/accepted PY - 2005/2/1/pubmed PY - 2005/3/25/medline PY - 2005/2/1/entrez SP - 89 EP - 96 JF - Mutation research JO - Mutat. Res. VL - 570 IS - 1 N2 - The diagnosis of hereditary non-polyposis colorectal cancer (HNPCC) is often confirmed by a mutation in one of several mismatch-repair genes, in particular MLH1, MSH2 and MSH6. Presymptomatic diagnosis requires the identification of a mutation causing the disease. Three different deletions of a single amino acid codon have previously been published as assumed pathogenic. The objective of this study was to determine if an MSH2 3 base pair in-frame deletion (N596del) could be used in presymptomatic screening of at-risk individuals. We report on five HNPCC families with the N596del mutation, identified after mutation screening of MSH2 and MLH1. All patients in the families were haplotyped using markers flanking the MSH2 gene. The haplotypes revealed that the five families with high probability descended from only two founders. The N596del segregated with the HNPCC phenotype with lod scores of 3.2 and 2.0 at the recombination fraction of 0.0 in the two founder families. Sequencing of MSH2 and MLH1 did not reveal other pathogenic mutations, and N596del was not identified in 50 healthy controls. The mutation has previously been found expressed in mRNA, and is located in a conserved domain. The results support the hypothesis that N596del is the disease causing mutation and not a clinically silent variation. On this basis, the application of the MSH2 N596del mutation, in presymptomatic screening of HNPCC families, is recommended. SN - 0027-5107 UR - https://www.unboundmedicine.com/medline/citation/15680406/Presymptomatic_diagnosis_using_a_deletion_of_a_single_codon_in_families_with_hereditary_non_polyposis_colorectal_cancer_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0027-5107(04)00397-5 DB - PRIME DP - Unbound Medicine ER -