Human Molecular Genetics, Vol 5, 763-769, Copyright © 1996 by Oxford University Press
M Nystrom-Lahti, Y Wu, AL Moisio, RM Hofstra, J Osinga, JP Mecklin, HJ Jarvinen, J Leisti, CH Buys, A de la Chapelle and P Peltomaki
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.
ARTICLES
DNA mismatch repair gene mutations in 55 kindreds with verified or putative hereditary non-polyposis colorectal cancer
Department of Medical Genetics, Haartman Institute, University of Helsinki, Finland.
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