LADD syndrome is caused by FGF10 mutations

Clinical Genetics
J M MilunskyD B Everman

Abstract

Lacrimo-auriculo-dento-digital syndrome [LADD (MIM 149730)] is an autosomal-dominant multiple congenital anomaly disorder characterized by aplasia, atresia or hypoplasia of the lacrimal and salivary systems, cup-shaped ears, hearing loss, and dental and digital anomalies. Loss of function mutations in FGF10 were recently described in aplasia of the lacrimal and salivary glands [ALSG (MIM 180920; MIM 103420)] (Entesarian et al., Nat Genet 2005: 37: 125-127, Milunsky et al., American College of Medical Genetics Annual Meeting, Dallas, TX, 2005: A100). Due to the significant phenotypic overlap between LADD syndrome and ALSG and the variable expressivity of both the disorders, we hypothesized that FGF10 mutations could also result in LADD syndrome. A de novo missense mutation was found in exon 3 of FGF10 in a 3-year-old female (Family 1) with LADD syndrome. This missense mutation, resulting in a non-conservative amino acid change, was confirmed by restriction enzyme digestion and was not found in 500 control chromosomes. A nonsense mutation was also found in exon 2 of FGF10 (Family 2) in a 19-year-old mother with ALSG and her 2-year-old daughter with LADD syndrome. Previous studies of FGF10 mutant mice have demonstrated abnormaliti...Continue Reading

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