Aplasia of lacrimal and salivary glands (ALSG) is a rare autosomal dominant condition characterized by irritable eyes, epiphora (constant tearing), and xerostomia (dryness of the mouth), which increases risk of dental erosion, dental caries, periodontal disease, and oral infections. ALSG has variable expressivity, and affected individuals may have aplasia or hypoplasia of the lacrimal, parotid, submandibular, and sublingual glands and absence of the lacrimal puncta. In affected individuals, the misdiagnosis is often made of the more prevalent disorder Sjogren syndrome (270150), an autoimmune condition characterized by keratoconjunctivitis sicca and xerostomia. Both sporadic and familial cases of ALSG have been described (summary by Entesarian et al., 2005).

Waardenburg syndrome type 4 is an auditory-pigmentary syndrome characterized by pigmentary abnormalities of the eye, deafness, and Hirschsprung disease (review by Read and Newton, 1997). WS type 4C is caused by mutation in the SOX10 gene (602229). WS type 4 is genetically heterogeneous (see WS4A; 277580). For a description of other clinical variants of Waardenburg syndrome, see WS1 (193500), WS2 (193510), and WS3 (148820).

Lacrimoauriculodentodigital syndrome-1 (LADD1) is a multiple congenital anomaly disorder mainly affecting lacrimal glands and ducts, salivary glands and ducts, ears, teeth, and distal limb segments (summary by Rohmann et al., 2006). Genetic Heterogeneity of Lacrimoauriculodentodigital Syndrome LADD syndrome-2 (LADD2; 620192) is caused by mutation in the FGFR3 gene (134934) on chromosome 4p16, and LADD syndrome-3 (LADD3; 620193) is caused by mutation in the FGF10 gene, an FGFR ligand, on chromosome 5p12.