Mondo Description Opitz G/BBB syndrome (OS) is a multiple congenital anomalies disorder characterized by malformations of the midline including hypertelorism, laryngo-tracheo-esophalgeal defects and hypospadias. There are two clinically indistinguishable genetic subtypes of Opitz G/BBB: X-linked Opitz G/BBB syndrome (XLOS), and autosomal dominant Opitz G/BBB syndrome (ADOS).

Disease Ontology Description A monogenic disease that is characterized by hypertelorism, hypospadias, and additional midline defects resulting from mutations to the MID1 gene in the X-linked form or from a deletion on chromosome 22q11.2 in the autosomal dominant form.