Mowat-Wilson Syndrome

**Semantic type:** Disease or Syndrome

**Definition:** A rare autosomal dominant syndrome caused by mutations in the ZEB2 gene. It is characterized by mental retardation, and a distinctive facial appearance (wide set eyes, uplifted earlobes, broad nasal bridge, prominent chin, and a smiling expression). The majority of patients have Hirschsprung disease (colonic enlargement and constipation due to intestinal blockage).