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Institut National de la Santé et de la Recherche Médicale (INSERM) EPI 9906, Faculté de Médecine et de Pharmacie, 76183 Rouen, and IFRMP, 76821 Mont-Saint-Aignan Cedex [F. Ch., G. R., N. D., F. Co., T. F.]; Unité dOncologie Moléculaire et INSERM U453, Centre Léon Bérard, 69008 Lyon [Q. W., A. P.]; Service dOncologie, Hôpitaux Universitaires, 67091 Strasbourg [J-M. L.]; Fédération des Spécialités Digestives, Hôpital Edouard Herriot, 69437 Lyon [J-C. S.]; and Fondation Jean Dausset-CEPH, 75010 Paris [S. O.], France
Large genomic deletions within the mismatch repair MLH1 and MSH2 genes have been identified in families with the hereditary nonpolyposis colorectal cancer (HNPCC) syndrome, and their detection represents a technical problem. To facilitate their detection, we developed a simple semiquantitative procedure based on the multiplex PCR of short fluorescent fragments. This method allowed us to confirm in HNPCC families three known deletions of MLH1 or MSH2 and to detect in 19 HNPCC families, in which analysis of mismatch repair genes using classical methods had revealed no alteration, a deletion of exon 5 and a duplication of MSH2 involving exons 9 and 10. The presence of such duplications, the frequency of which is probably underestimated, must be considered in HNPCC families in which conventional screening methods have failed to detect mutations.
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