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Investigation of deletions at 7q11.23 in 44 patients referred for Williams-Beuren syndrome,using FISH and four DNA polymorphisms |
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| Authors: | K. Brøndum-Nielsen Bente Beck Jolanda Gyftodimou Henning Hørlyk Ulf Liljenberg Minna Bloch Petersen Winni Pedersen Michael B. Petersen Annie Sand Flemming Skovby Gerd Stafanger P. Zetterqvist Niels Tommerup |
| Affiliation: | John F. Kennedy Institute, Gl Landevej, DK-2600 Glostrup, Denmark Tel.: +45 43 26 01 00; Fax: +45 43 43 11 30 e-mail: kbn@kennedy.dk, DK County Center for Multihandicapped Children, Gentofte, Denmark, DK Department of Genetics, Institute of Child Health, Aghia Sophia Children’s Hospital, Athens, Greece, GR Department of Pediatrics, Hiller?d Hospital, Denmark, DK Specialistl?kargruppen, V?xj?, Sweden, SE Department of Pediatrics, Roskilde Hospital, Denmark, DK Department of Clinical Genetics, Juliane Marie Center, Rigshospitalet, Copenhagen, Denmark, DK |
| Abstract: | Williams syndrome (WS) is associated with a submicroscopic deletion of the elastin gene (ELN) at 7q11.23. The deletion encompasses closely linked DNA markers. We have investigated 44 patients referred for possible WS using fluorescence in situ hybridization (FISH) analysis with a P1 clone containing an insert from the ELN, as well as performing genotype analysis of patients and parents with four DNA polymorphisms. Twenty-four patients were found to have deletions, 19 of whom were found clinically to have typical WS. The facial features were especially characteristic. None of the patients without detectable deletions was reported to have typical WS features, although one had supravalvular aortic stenosis, hypercalcemia, and mental retardation. No evidence was found in this material for variability of the size of the deletion. Our study supports the usefulness of analysis of ELN deletion in WS patients, both for confirmation of diagnosis and for genetic counselling. Received: 2 August 1996 |
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