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Mowat-Wilson syndrome (MWS) is a developmental condition caused by a pathogenic variant, deletion, or rare chromosome rearrangement involving ZEB2. Classic MWS has a recognizable pattern, but ZEB2-related findings form a spectrum. Development, speech, movement, seizures, the bowel, heart, genitourinary system, eyes, and brain structure can be affected in different combinations. The recently revised GeneReviews chapter provides current diagnosis and management guidance.
Urgent and procedure-related safety
For a person with Hirschsprung disease, fever with a swollen abdomen, sudden worsening constipation, vomiting, explosive or watery diarrhea, unusual sleepiness, or poor feeding can indicate enterocolitis or obstruction and needs urgent medical assessment. Green vomit, severe abdominal pain or distension, blood in stool, dehydration, or inability to pass stool or gas also warrants emergency review.
Seek urgent assessment for breathing difficulty, color change, repeated choking, a first or prolonged seizure, injury during a seizure, or failure to return toward the person's usual alertness. A written seizure plan should state when rescue medicine is used and when emergency help is needed.
Pain, constipation, reflux, dental or ear disease, infection, sleep disruption, seizures, and communication frustration may present as withdrawal, agitation, or self-injury. A new behavior change should trigger medical, sensory, environmental, and communication review rather than being attributed automatically to MWS.
Quick reference
| Topic | Condition-specific guidance |
|---|---|
| Cause | Reduced ZEB2 function, usually from a new genetic change; family recurrence assessment depends on the identified change and parental testing |
| Diagnosis | Recognizable clinical pattern and molecular testing for ZEB2 sequence, copy-number, or chromosome changes |
| Bowel | Hirschsprung disease and chronic constipation require distinct assessment and follow-up |
| Communication | Speech may be markedly limited while understanding, social intent, gesture, and learning strengths are greater than speech suggests |
| Feeding | Reflux, oral-motor coordination, sensory factors, constipation, and dysphagia may contribute |
| AAC | Early, multimodal, and matched to the person's language, movement, sensory access, and environments |
Recognition and diagnosis
Possible findings include developmental delay, postnatal microcephaly, characteristic facial features that evolve with age, absent or limited speech, a wide-based gait, seizures, Hirschsprung disease or chronic constipation, congenital heart disease, genitourinary anomalies, eye findings, and hypoplasia or absence of the corpus callosum. No single feature is required in every person.
Diagnosis may be made from a characteristic clinical pattern and confirmed by molecular testing. Depending on the presentation and prior tests, evaluation may include ZEB2 sequencing and deletion or duplication analysis, chromosomal microarray, or broader genomic testing. A clinical geneticist can interpret the result, assess for a larger deletion or rearrangement, coordinate parental testing, and provide recurrence counseling.
Coordinated care
Initial review is guided by the person's findings and may include echocardiography, bowel and feeding evaluation, renal or genitourinary assessment, eye and hearing assessment, neurologic review, growth and nutrition, dental care, and musculoskeletal examination. Ongoing care may involve genetics, primary care, gastroenterology or colorectal surgery, neurology, cardiology, urology, ophthalmology, audiology, rehabilitation, nutrition, dentistry, and speech-language pathology.
Constipation can remain clinically important even without diagnosed Hirschsprung disease or after bowel surgery. The bowel plan should be explicit, monitored for effectiveness, and transferred between home, school, respite, and health-care settings. Mobility, bone health, sleep, pain, and participation should also be revisited over time.
Speech, language, and interaction
Expressive speech is often more affected than receptive communication. Some people use speech, while others communicate primarily through gesture, sign, objects, pictures, or technology. Sociability or a smiling expression should not be mistaken for agreement, absence of pain, or lack of complex preferences.
Assessment should directly examine hearing, comprehension, expression, speech and motor planning, literacy, vision, gesture, social interaction, and communication across partners. Provide a reliable way to express pain, bowel symptoms, seizures, refusal, consent, preferences, and the need for a break. Allow response time and confirm the person's intended message.
Feeding and swallowing
Feeding difficulty can reflect reflux, dysphagia, reduced oral coordination, sensory responses, constipation, respiratory illness, or endurance. Concerning signs include coughing or choking, wet or changed voice, congestion with meals, recurrent chest illness, prolonged feeding, distress, poor intake, or growth and hydration concerns.
Clinical feeding and swallowing assessment should consider posture, breathing, oral movement and sensation, mealtime interaction, gastrointestinal symptoms, nutrition, and the person's preferences. Instrumental assessment may be indicated when swallowing physiology or aspiration risk remains unclear. Positioning, pacing, texture, reflux treatment, and oral or tube-feeding decisions require individualized assessment and shared planning.
AAC and access planning
AAC should be considered early when speech does not meet communication needs; it does not require cognitive, motor, behavioral, or age prerequisites. A multimodal plan can combine vocalization, facial expression, gesture, sign, objects, pictures, writing, partner strategies, and technology. Communication teaching should be available throughout the day rather than restricted to therapy sessions.
Feature matching should assess language and literacy, vision, hearing, hand use, gait and posture, endurance, sensory preferences, seizure safety, and communication environments. Touch, adapted direct selection, switches, eye tracking, partner-assisted scanning, and other methods are possibilities to trial, not diagnosis-based prescriptions. Include robust personal, social, health, consent, education, and emergency vocabulary; train partners; and keep an accessible low-tech backup. See the AAC assessment and acquisition guide and ASHA AAC Practice Portal.
Participation and prognosis
Education and adult services should use observed strengths and needs rather than assume a fixed cognitive level from speech or diagnosis. Plans may need accessible communication, supported decision-making, adapted movement or task access, explicit health routines, and opportunities for relationships, leisure, community life, and meaningful work.
There is no single MWS trajectory. Medical complications, seizure control, bowel and feeding health, sensory access, development, environment, and available supports all affect outcome. Reassessment is appropriate after changes in health, communication, mobility, behavior, education, work, or living situation.