Overview
Disorder of thiamine metabolism and transport is a group of rare inherited conditions where the body cannot properly use or move thiamine (vitamin B1) to where it is needed. Thiamine is a vital nutrient that helps cells produce energy, and it is especially important for the brain, nerves, and heart. When thiamine cannot be properly absorbed, transported into cells, or converted into its active form, serious health problems can develop. These disorders can affect multiple organ systems. Common problems include brain disease (encephalopathy), nerve damage, muscle weakness, hearing loss, vision problems, and metabolic crises — especially during illness or fever. Some forms present in infancy with severe neurological decline, while others may appear later in childhood with episodes of confusion, difficulty walking, or stroke-like events. The good news is that many of these conditions respond to high-dose thiamine (vitamin B1) supplementation, sometimes dramatically improving symptoms if started early. However, the degree of response varies depending on the specific genetic cause and how early treatment begins. Without treatment, these disorders can lead to permanent brain damage or even be life-threatening. Early diagnosis through genetic testing and prompt initiation of thiamine therapy are critical for the best possible outcomes. The group includes conditions sometimes known as thiamine-responsive megaloblastic anemia syndrome, biotin-thiamine-responsive basal ganglia disease, and thiamine transporter deficiency, among others.
Key symptoms:
Episodes of confusion or altered consciousnessDifficulty walking or loss of coordinationMuscle weaknessSeizuresHearing lossVision problems or vision lossSlurred speech or difficulty speakingDifficulty swallowingInvoluntary muscle movements (dystonia)Developmental delay or regressionAnemia (low red blood cell count)Diabetes at a young ageStroke-like episodesFatigue and low energyPoor growth or failure to thrive
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for Disorder of thiamine metabolism and transport.
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Specialists
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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 Disorder of thiamine metabolism and transport.
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Caregiver Resources
NORD Caregiver Resources
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Mental Health Support
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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 specific type of thiamine metabolism disorder does my child have, and which gene is affected?,What is the recommended dose of thiamine, and should biotin also be given?,What should I do if my child develops a fever or becomes ill — is there an emergency protocol?,How often should hearing, vision, and neurological assessments be done?,What are the signs that the condition may be getting worse despite treatment?,Are there any clinical trials or new treatments being studied for this condition?,Should other family members be tested for this genetic condition?
Common questions about Disorder of thiamine metabolism and transport
What is Disorder of thiamine metabolism and transport?
Disorder of thiamine metabolism and transport is a group of rare inherited conditions where the body cannot properly use or move thiamine (vitamin B1) to where it is needed. Thiamine is a vital nutrient that helps cells produce energy, and it is especially important for the brain, nerves, and heart. When thiamine cannot be properly absorbed, transported into cells, or converted into its active form, serious health problems can develop. These disorders can affect multiple organ systems. Common problems include brain disease (encephalopathy), nerve damage, muscle weakness, hearing loss, vision
How is Disorder of thiamine metabolism and transport inherited?
Disorder of thiamine metabolism and transport follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.