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Phenotypic variability in Muenke syndrome-observations from five Danish families

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Muenke syndrome is a craniosynostosis syndrome associated with the p.Pro250Arg mutation in FGFR3. An increasing number of individuals with this mutation are reported to not have craniosynostosis. The purpose of this report is to increase awareness of the high phenotypic variability seen in Muenke syndrome. DNA testing for the p.Pro250Arg mutation is routinely performed in Denmark, in children presenting with isolated coronal synostosis. Verified diagnosis entails detailed family history, drawing of family pedigree, DNA testing of the parents, genetic counseling, skull radiographs, clinical photographs, and follow-up. Sixteen individuals from 5 Danish families with Muenke syndrome are presented. Large phenotypic variation was seen both within and across families. The most striking observations were that 6/16 (38%) cases did not have craniosynostosis and one individual presented with a normal phenotype. In addition, 3 unrelated cases had incomplete cleft palate, submucous cleft palate, and bifid uvula, respectively. There is strong evidence for reduced penetrance of the craniosynostosis trait in Muenke syndrome. We argue that many studies on Muenke syndrome have been influenced by ascertainment bias in regard to craniosynostosis. In addition, it is suggested that oral clefting might be part of the clinical spectrum seen in Muenke syndrome.

Original languageEnglish
JournalCoronary Artery Disease
Volume29
Issue number1
Pages (from-to)1-9
Number of pages9
ISSN0954-6928
DOIs
Publication statusPublished - 2020

ID: 58279331