Overview
4H leukodystrophy is a rare genetic disorder that affects the brain's white matter (the insulation around nerve fibers) along with the teeth and certain hormones. The name '4H' stands for Hypomyelination (not enough of the protective coating around nerves), Hypodontia (missing teeth), and Hypogonadotropic Hypogonadism (a hormone problem that affects puberty and sexual development). It is also known as POLR3-related leukodystrophy, because it is caused by mutations in genes that make parts of an enzyme called RNA polymerase III. Other names include tremor-ataxia with central hypomyelination (TACH), leukodystrophy with oligodontia, and 4H syndrome. Children with 4H leukodystrophy typically develop problems with movement, including difficulty walking, tremors, and poor coordination (ataxia). Over time, motor skills tend to worsen. Many children also have delayed or absent teeth, and puberty may be delayed or incomplete due to hormone deficiencies. Some individuals experience learning difficulties, speech problems, and vision changes such as nearsightedness. There is currently no cure for 4H leukodystrophy. Treatment focuses on managing symptoms and supporting quality of life. This includes physical therapy, occupational therapy, speech therapy, dental care for missing teeth, and hormone replacement therapy when needed. Research is ongoing to better understand the disease and develop new treatments.
Also known as:
Key symptoms:
Difficulty walking and poor balance (ataxia)Tremors, especially in the handsMuscle stiffness or spasticityDelayed motor milestonesMissing or abnormally small teethDelayed or absent pubertySpeech difficultiesNearsightedness (myopia)Learning difficulties or intellectual disabilityDifficulty swallowingProgressive loss of motor skillsShort statureAbnormal eye movementsSeizures (in some cases)
Clinical phenotype terms (32)— hover any for plain English
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Childhood
Begins in childhood, roughly ages 1 to 12
Treatments
No FDA-approved treatments are currently listed for 4H leukodystrophy.
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Rare Disease Specialist
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to 4H leukodystrophy.
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Caregiver Resources
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What is the expected rate of progression for my child's specific case?,When should we start hormone replacement therapy, and what are the benefits and risks?,What therapies (physical, occupational, speech) should we begin now?,Are there any clinical trials or research studies we should consider?,How often should brain MRIs and other monitoring tests be done?,What should we do if symptoms suddenly worsen during an illness?,Can you refer us to a leukodystrophy center or multidisciplinary team?
Common questions about 4H leukodystrophy
What is 4H leukodystrophy?
4H leukodystrophy is a rare genetic disorder that affects the brain's white matter (the insulation around nerve fibers) along with the teeth and certain hormones. The name '4H' stands for Hypomyelination (not enough of the protective coating around nerves), Hypodontia (missing teeth), and Hypogonadotropic Hypogonadism (a hormone problem that affects puberty and sexual development). It is also known as POLR3-related leukodystrophy, because it is caused by mutations in genes that make parts of an enzyme called RNA polymerase III. Other names include tremor-ataxia with central hypomyelination (TA
How is 4H leukodystrophy inherited?
4H leukodystrophy follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does 4H leukodystrophy typically begin?
Typical onset of 4H leukodystrophy is childhood. Age of onset can vary across affected individuals.
Which specialists treat 4H leukodystrophy?
1 specialists and care centers treating 4H leukodystrophy are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.