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Living with Joubert syndrome

A genetic condition of brain development, with low muscle tone, balance problems, eye movement differences, and developmental delay.

Understanding Joubert syndrome

Joubert syndrome is a genetic condition that affects how the brain develops and can affect many other parts of the body.

The hallmark is the molar tooth sign, a pattern in the back of the brain seen on MRI. Infants often have low muscle tone and may have breathing episodes that are too fast or too slow. Most people have intellectual disability, from mild to severe, and speech and motor skills are often delayed. Balance and coordination problems are common but may lessen over time. Signs vary even within a family.

Signs & symptoms

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

  • Low muscle tone (hypotonia)
  • Balance and coordination problems (ataxia)
  • Fast, rhythmic eye movements (nystagmus)
  • Delayed speech and motor skills
  • Breathing episodes that are too fast or slow
  • Intellectual disability

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, 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); 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 genetic testing find the gene change behind my child's Joubert syndrome?
Should my child be checked for kidney or other organ problems?
Which therapies can help with movement, speech, and feeding?

Quick facts

Symptoms usually startduring Pregnancy
InheritanceAutosomal Recessive

GARD says changes in genes (also called variants) cause this condition. It is autosomal recessive, meaning a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: cerebelloparenchymal disorder iv; classic joubert syndrome; cpd iv; familial aplasia of the vermis; jbts; joubert syndrome type a

Patient organizations

Source: NIH GARD · Joubert syndromeGARD ID 6802 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

Explore research for Joubert syndrome

Explore actively recruiting Joubert syndrome studies with HealthSpark.

HealthSpark

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

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • 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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