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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Crouzon syndrome: mutations in two spliceoforms of FGFR2 and a common point mutation shared with Jackson-Weiss syndrome.
Human Molecular Genetics 1995 August
Dominant mutations in the fibroblast growth factor receptor 2 (FGFR2) gene have been recently identified as causes of four phenotypically distinct craniosynostosis syndromes, including Crouzon, Jackson-Weiss, Pfeiffer, and Apert syndromes. These data suggest that the genetics of the craniosynostosis syndromes is more complex than would be expected from their simple autosomal-dominant inheritance pattern. Identical mutations in the FGFR2 gene have been reported to cause both Pfeiffer and Crouzon syndrome phenotypes. We now report the finding of a mutation in exon IIIc of the FGFR2 gene in a kindred affected with Crouzon syndrome (C1043 to G; Ala344Gly) that is identical to the mutation previously associated with Jackson-Weiss syndrome. We also report finding in a Crouzon kindred a mutation in the 3' end of exon IIIu (formerly referred to as exon 5, exon 7, or exon U) (A878 to C; Gln289Pro) which encodes the amino terminal portion of the Ig-like III domain of the FGFR2 protein. This exon is common to both the FGFR2 and the KGFR spliceoforms of the FGFR2 gene, unlike all previously reported Crouzon mutations, which have been found only in the FGFR2 spliceoform. These findings reveal further unexpected complexity in the molecular genetics of these craniosynostosis syndromes. The data implies that second-site mutations in FGFR2 itself (outside of exon IIIc) or in other genes may determine specific aspects of the phenotypes of craniosynostosis syndromes.
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