Apert syndrome (AS) is clinically characterized by typical facial features and symmetrical syndactyly of the digits. AS is inherited as an autosomal dominant trait. Recently, a fibroblast growth factor receptor 2 (FGFR2) mutation, either C934G or C937G, was identified in exon IIIa. Our report documents an affected mother and son in whom one of the two mutations in AS had occurred sporadically in the mother. The diagnosis of AS was based on associated abnormal physical features and on molecular genetic analysis, A C-to-G transversion at position 937 of the cDNA resulting in a proline-to-arginine substitution at codon 253 was found in the mother. In her second pregnancy, prenatal diagnosis by both restriction analysis and direct sequencing was undertaken and this showed that the female fetus had not inherited the mutation. (C) 1998 John Wiley & Sons, Ltd.
