Overview
Multiple mitochondrial dysfunctions syndrome (MMDS) is a group of very rare and severe genetic disorders that affect how the body's cells produce energy. Mitochondria are tiny structures inside nearly every cell that act as power plants, converting food into the energy your body needs to function. In MMDS, several key enzymes inside the mitochondria do not work properly because of problems with iron-sulfur cluster assembly — a process essential for building these enzymes. This leads to widespread energy failure across many organs. There are several subtypes of MMDS (types 1 through 9 and beyond), each caused by mutations in different genes. Symptoms typically appear very early in life, often in the newborn period or infancy. Common signs include severe muscle weakness, breathing difficulties, poor feeding, seizures, abnormal brain development, and a dangerous buildup of lactic acid in the blood (lactic acidosis). Many affected children also have heart problems and developmental delays. Unfortunately, there is currently no cure for MMDS. Treatment is supportive and focuses on managing symptoms such as seizures, breathing problems, and nutritional needs. The condition is generally very serious, and many affected infants have a significantly shortened lifespan. Research into mitochondrial diseases is ongoing, and families are encouraged to connect with metabolic specialists and genetic counselors for the most up-to-date guidance and support.
Key symptoms:
Severe muscle weaknessSeizuresDifficulty breathing or respiratory failurePoor feeding and failure to thriveBuildup of lactic acid in the blood (lactic acidosis)Developmental delay or regressionAbnormal brain developmentHeart problems (cardiomyopathy)Low muscle tone (floppiness)Abnormal eye movementsLiver dysfunctionLethargy or extreme sleepinessMovement problemsSwallowing difficultiesHigh levels of glycine in the blood and urine
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Multiple mitochondrial dysfunctions syndrome.
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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 Multiple mitochondrial dysfunctions syndrome.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
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.Which specific subtype of MMDS does my child have, and what gene is affected?,What is the expected course of this condition for my child's specific subtype?,What symptoms should prompt me to go to the emergency room immediately?,Are there any supplements or vitamins that might help, even if evidence is limited?,Is there a metabolic emergency protocol letter I should carry with me at all times?,Are there any clinical trials or research studies my child might be eligible for?,Can you connect us with palliative care and family support services?
Common questions about Multiple mitochondrial dysfunctions syndrome
What is Multiple mitochondrial dysfunctions syndrome?
Multiple mitochondrial dysfunctions syndrome (MMDS) is a group of very rare and severe genetic disorders that affect how the body's cells produce energy. Mitochondria are tiny structures inside nearly every cell that act as power plants, converting food into the energy your body needs to function. In MMDS, several key enzymes inside the mitochondria do not work properly because of problems with iron-sulfur cluster assembly — a process essential for building these enzymes. This leads to widespread energy failure across many organs. There are several subtypes of MMDS (types 1 through 9 and beyo
How is Multiple mitochondrial dysfunctions syndrome inherited?
Multiple mitochondrial dysfunctions syndrome follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Multiple mitochondrial dysfunctions syndrome typically begin?
Typical onset of Multiple mitochondrial dysfunctions syndrome is neonatal. Age of onset can vary across affected individuals.
Which specialists treat Multiple mitochondrial dysfunctions syndrome?
2 specialists and care centers treating Multiple mitochondrial dysfunctions syndrome are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.