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DNA mismatch repair gene mutations in 55 kindreds with verified or putative hereditary non-polyposis colorectal cancer.

Abstract：

:The DNA mismatch repair genes MSH2 and MLH1 have been shown to account for a major share of hereditary non-polyposis colorectal cancer (HNPCC). We searched for germline mutations in these genes in 35 HNPCC kindreds fulfilling the Amsterdam diagnostic criteria and in a further 20 kindreds with an average of four affected members per family but not meeting the formal criteria. We first screened for truncations by reverse transcriptase (RT)-PCR. If no mutation was found, we screened genomic DNA by a novel application of two-dimensional (2-D) DNA electrophoresis that allows the simultaneous study of all exons of each gene. All abnormalities were followed up by sequencing. Eight different pathogenic germline mutations were found, two in MSH2 and six in MLH1. We report three major conclusions. First, these mutations together accounted for 86% (30/35) of the kindreds meeting the Amsterdam criteria, but only 30% (6/20) of the remaining kindreds, suggesting differences in etiology. Second, MLH1 was involved in > 90% (34/36) of kindreds with a known predisposing mutation, suggesting that mutations in the MLH1 gene are responsible for most HNPCC kindreds in Finland. Third, our results indicate that the successive application of RT-PCR and 2-D DNA electrophoresis is a sensitive and efficient method for mutation screening in typical HNPCC.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Nyström-Lahti M,Wu Y,Moisio AL,Hofstra RM,Osinga J,Mecklin JP,Järvinen HJ,Leisti J,Buys CH,de la Chapelle A,Peltomäki P

doi

10.1093/hmg/5.6.763

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

763-9

issue

6

eissn

0964-6906

issn

1460-2083

pii

6d0002

journal_volume

5

pub_type

杂志文章

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