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Living with Syndromic X-linked intellectual disability 12

An X-linked condition with severe intellectual disability, no speech, seizures, slow growth, and frequent infections.

Understanding Syndromic X-linked intellectual disability 12

Syndromic X-linked intellectual disability 12 (Wilson type) is an X-linked condition with severe intellectual disability and seizures.

People have severe intellectual disability with mutism (not speaking), epilepsy, and slow growth. Repeated infections are common. Facial features can include a square face, a wide mouth, and full lips. Signs may begin in childhood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Severe intellectual disability
  • Not speaking (mutism)
  • Seizures
  • Slow growth
  • Repeated infections
  • Square face and wide mouth

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What therapies can help communication?
How can we manage seizures and infections?
Could other family members carry this gene change?

Quick facts

Symptoms usually startChild
InheritanceX-Linked

This condition is X-linked, meaning the gene is on the X chromosome. GARD says the gene has been mapped to the 11p region of the X chromosome but doesn't name it.

GeneticNeurological

Also known as: intellectual disability, x-linked, syndromic 12; syndromic x-linked intellectual disability type 12; x-linked intellectual disability, wilson type

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Syndromic X-linked intellectual disability 12GARD ID 16747 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Syndromic X-linked intellectual disability 12.

Explore the Syndromic X-linked intellectual disability 12 blog

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HealthSpark

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  • Eligibility is confirmed by the study team

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