Overview
Disorder of the gamma-glutamyl cycle is a rare inherited metabolic condition that affects the body's ability to properly manage a chemical pathway called the gamma-glutamyl cycle. This cycle plays an important role in producing and recycling glutathione, one of the body's most important natural antioxidants and protective molecules. When this cycle does not work correctly, harmful substances can build up in the body, and cells — especially in the brain and nervous system — may not be protected from damage as they should be. This group of disorders includes several specific conditions caused by defects in different enzymes (proteins that drive chemical reactions) along the same pathway. The most well-known examples include glutathione synthetase deficiency, 5-oxoprolinuria (also called pyroglutamic aciduria), gamma-glutamylcysteine synthetase deficiency, and glutathione peroxidase deficiency. Depending on which enzyme is affected, symptoms can range from a buildup of acid in the blood (metabolic acidosis) in newborns, to anemia caused by red blood cell breakdown (hemolytic anemia), to neurological problems such as intellectual disability, seizures, and movement difficulties. Treatment is mainly focused on managing symptoms. This may include giving antioxidant vitamins like vitamin C and vitamin E, correcting acid levels in the blood, and treating anemia. There is currently no cure for these conditions, but early diagnosis and careful management can help reduce complications and improve quality of life.
Key symptoms:
Buildup of acid in the blood (metabolic acidosis), especially in newbornsHemolytic anemia (red blood cells breaking down too quickly, causing fatigue and paleness)Intellectual disability or learning difficultiesSeizures or epilepsyProblems with coordination and balance (ataxia)Muscle weakness or low muscle toneBehavioral or psychiatric problemsRecurrent infections due to weakened immune defensesJaundice (yellowing of the skin or eyes) in newbornsSlow growth or failure to thrive in infantsNeurological decline over time in some forms
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 the gamma-glutamyl cycle.
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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 the gamma-glutamyl cycle.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
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.Which specific enzyme in the gamma-glutamyl cycle is affected in my (or my child's) case, and what does that mean for symptoms and treatment?,Should other family members, including siblings, be tested for this condition?,What blood tests or urine tests should be done regularly to monitor the condition?,Are there any clinical trials or research studies we should know about?,What are the warning signs of a metabolic crisis, and what should we do if one happens?,Will this condition affect learning, development, or independence long-term?,Are there any dietary changes or supplements that could help beyond what is already prescribed?
Common questions about Disorder of the gamma-glutamyl cycle
What is Disorder of the gamma-glutamyl cycle?
Disorder of the gamma-glutamyl cycle is a rare inherited metabolic condition that affects the body's ability to properly manage a chemical pathway called the gamma-glutamyl cycle. This cycle plays an important role in producing and recycling glutathione, one of the body's most important natural antioxidants and protective molecules. When this cycle does not work correctly, harmful substances can build up in the body, and cells — especially in the brain and nervous system — may not be protected from damage as they should be. This group of disorders includes several specific conditions caused b
How is Disorder of the gamma-glutamyl cycle inherited?
Disorder of the gamma-glutamyl cycle follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.