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Living with COACH syndrome

A rare form of Joubert syndrome that mainly affects the brain and liver, causing learning disability, poor coordination, and liver scarring.

Understanding COACH syndrome

COACH syndrome (Joubert syndrome with hepatic defect) is a condition that mainly affects the brain and liver.

Most people have intellectual disability, liver scarring (fibrosis), and difficulty with movement (ataxia). Some also have an eye gap (coloboma) or abnormal eye movements such as nystagmus. It is considered a rare form of Joubert syndrome. GARD lists onset in the newborn period.

Signs & symptoms

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

  • Intellectual disability
  • Poor coordination (ataxia)
  • Liver scarring (fibrosis)
  • Small or missing cerebellum
  • Eye gap (coloboma)
  • Abnormal eye movements (nystagmus)

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, digestive system specialists, eye disease specialists and genetic specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    National Ataxia Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Digestive system specialists (gastroenterologists); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Expert lists: National Ataxia Foundation
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 Joubert Syndrome & Related Disorders Foundation and other patient organizations
  • 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
Can TMEM67 genetic testing confirm the diagnosis?
How should the liver be monitored?
How can we support movement, vision, and learning?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Recessive

GARD says about 70% of cases are thought to be caused by changes in the TMEM67 gene. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalGastrointestinal

Also known as: cerebellar vermis hypo/aplasia, oligophrenia, congenital ataxia, ocular coloboma, and hepatic fibrosis; cerebellar vermis hypoplasia-oligophrenia-congenital ataxia-coloboma-hepatic fibrosis; cerebellar vermis hypoplasia, oligophrenia, congenital ataxia, coloboma, hepatic fibrosis; coach (cerebellar vermis hypoplasia, oligophrenia, congenital ataxia, coloboma, hepatic fibrosis) syndrome; coach1; gentile syndrome

Patient organizations

Source: NIH GARD · COACH syndromeGARD ID 1410 · 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 COACH syndrome.

Explore the COACH syndrome blog

Explore research for COACH syndrome

Explore actively recruiting COACH syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for COACH syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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