© 1994 Oxford University Press
RESEARCH-ARTICLE |
Localization of the genetic locus for Saethre-Chotzen syndrome to a 6 cM region of Ihromosome 7 using four cases with apparently balanced translocations at 7p21.2
Unrts of Molecular Genetics and Clinical Genetics and FetaJ Medicine, Institute of Child Health 30 Guifford Street London WC1N 1EH 1Regional Cytogenetics Unit, Queen Elizabeth Hospital for Children London E2 8PS, UK 2611 El Toro Way, Davis CA 95616, USA 3Institute of Molecular Medicine, John Radclrffe Hospital, Headington Oxford 0X3 9DU, UK
* To whom correspondence should be addressed
Received May 4, 1994; Accepted June 2, 1994
Saethre - Chotzen syndrome is a common autosomal dominant form of cranlosynostosls, which results In the premature fusion of cranial sutures. Cranlosynostosls is commonly associated with abnormalities of 7p; Vortkamp et al. (Nature 352, 539 540) demonstrated that the GLI3 gene In 7p13 was disrupted in, patients with Greig syndrome and, more recently, the linkage of genetic markers from 7p with the Saethre - Chotzen syndrome locus has been reported (2, 3). Here we report the analysis by fluorescence In situ hybridization of four patients with Saethre-Chotzen syndrome associated with apparently balanced translocatlons Involving band 7p21.2 and different reciprocal chromosomes. We show that In all four patients the breakpoints in 7p are situated within a 6 cM region flanked by the genetic markers D7S488 and D7S493. These results provide further evidence that the genetic locus for Saethre-Chotzen syndrome is located in distal 7p.
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