Lacrimo‐auriculo‐dento‐digital syndrome: A novel mutation in a Korean family and review of literature

Background Lacrimo‐auriculo‐dento‐digital (LADD) syndrome is a rare autosomal dominant disorder caused by mutations in one of the three genes: fibroblast growth factor receptor 2 (FGFR2), FGFR3, or FGF10. Affected patients have hypoplasia/aplasia of lacrimal ducts/glands, hypoplasia/aplasia of salivary glands, dental anomalies, ear anomalies, hearing loss, and digital anomalies. Case Presentation Proband was an 11‐year‐old male with xerostomia, xerophthalmia, and a referring diagnosis of Sjogren syndrome. He presented with microdontia, hypodontia, low‐set/cupped ear auricles, and hearing loss in the left ear. Methods Whole exome sequencing (WES) was performed on proband. Variations and segregation within the family were verified using Sanger sequencing. Results Molecular studies revealed a novel heterozygous missense mutation in exon 11 of FGFR2: c.1547C>T (p.Ala516Val), compatible with LADD syndrome. Conclusion To the best of our knowledge, this is the first report of a family with LADD syndrome in Korea. The combination of xerostomia and xerophthalmia, seen in patients with LADD syndrome, may be misdiagnosed as Sjogren syndrome. WES may be a useful clinical tool in ascertaining the affected gene in patients with suspected genetic disorders. Here, a literature review and summary of 23 case reports/series of LADD syndrome are presented, which may help to identify patients with this condition.
Lacrimo‐auriculo‐dento‐digital (LADD) syndrome is a rare autosomal dominant genetic disease. Patients affected have malformations of the lacrimal ducts or glands, aplasia or hypoplasia of major salivary glands, dental anomalies, low‐set cup‐shaped ears, hearing loss, and digital anomalies. Here we report a novel mutation in a Korean family with LADD syndrome and a review of previous literature.