Mowat-Wilson syndrome due to monosomy 2q22

Mowat-Wilson syndrome due to monosomy 2q22 (Orphanet code 261537) is a rare genetic condition caused by a chromosomal deletion involving the 2q22 region, which encompasses the ZEB2 (also known as SIP1 or ZFHX1B) gene. This is a specific genetic subtype of Mowat-Wilson syndrome (MWS), where the condition arises from a microdeletion rather than a point mutation in the ZEB2 gene. The loss of one functional copy of ZEB2 disrupts normal embryonic development, particularly affecting the nervous system, gastrointestinal tract, heart, urogenital system, and craniofacial structures. Key clinical features include moderate to severe intellectual disability, distinctive facial features (such as widely spaced eyes, a broad nasal bridge, a pointed chin, and uplifted earlobes), epilepsy, and Hirschsprung disease (aganglionosis of the colon, reflected in the ICD-10 code Q43.1). Speech development is severely affected, with many individuals having absent or very limited expressive language, though receptive language skills may be comparatively better. Additional features can include congenital heart defects, urogenital anomalies (such as hypospadias or cryptorchidism), corpus callosum agenesis or hypoplasia, eye abnormalities, and short stature. Affected individuals typically have a happy and sociable demeanor. There is currently no cure for Mowat-Wilson syndrome due to monosomy 2q22. Management is supportive and multidisciplinary, addressing individual symptoms as they arise. This may include surgical intervention for Hirschsprung disease and congenital heart defects, antiepileptic medications for seizure control, speech and language therapy, physical therapy, and special educational support. Regular monitoring by a team of specialists including neurologists, gastroenterologists, cardiologists, and developmental pediatricians is recommended to optimize outcomes and quality of life.

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