Overview
Atypical Gaucher disease due to saposin C deficiency is an extremely rare inherited metabolic condition. It belongs to a group of diseases called lysosomal storage disorders. In typical Gaucher disease, the enzyme glucocerebrosidase does not work properly. In this atypical form, the enzyme itself may be normal, but a small helper protein called saposin C is missing or not working. Saposin C is needed to activate glucocerebrosidase so it can break down a fatty substance called glucocerebroside inside cells. Without functioning saposin C, glucocerebroside builds up in certain cells, especially in the spleen, liver, bones, and sometimes the brain and nervous system. Symptoms can resemble those of classic Gaucher disease and may include an enlarged spleen and liver, low blood counts, bone pain, and in some cases neurological problems. The severity and age of onset can vary between affected individuals. Some patients present in childhood with significant organ enlargement and blood abnormalities, while others may have a milder course. Because this condition is caused by a deficiency in saposin C rather than the enzyme itself, standard enzyme replacement therapy used for typical Gaucher disease may have limited effectiveness. Treatment is largely supportive and tailored to each patient's specific symptoms. Research into better therapies is ongoing, and management typically involves a team of specialists familiar with lysosomal storage disorders.
Key symptoms:
Enlarged spleenEnlarged liverLow platelet count causing easy bruising or bleedingAnemia or low red blood cell countBone painBone fractures or weakened bonesFatigue and low energyDelayed growth in childrenNeurological problems in some casesDifficulty with movement or coordination in severe casesSeizures in severe neuronopathic formsFrequent infections due to low white blood cell counts
Clinical phenotype terms (19)— hover any for plain English
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 Atypical Gaucher disease due to saposin C deficiency.
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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 Atypical Gaucher disease due to saposin C deficiency.
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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.Is enzyme replacement therapy likely to help in my case, given that the problem is with saposin C rather than the enzyme itself?,Should substrate reduction therapy be considered as an alternative or additional treatment?,How often should blood counts, organ size, and bone health be monitored?,Are there any clinical trials or experimental treatments available for saposin C deficiency?,What signs of neurological involvement should I watch for?,Should other family members be tested for carrier status?,What activity restrictions are recommended to protect the spleen and bones?
Common questions about Atypical Gaucher disease due to saposin C deficiency
What is Atypical Gaucher disease due to saposin C deficiency?
Atypical Gaucher disease due to saposin C deficiency is an extremely rare inherited metabolic condition. It belongs to a group of diseases called lysosomal storage disorders. In typical Gaucher disease, the enzyme glucocerebrosidase does not work properly. In this atypical form, the enzyme itself may be normal, but a small helper protein called saposin C is missing or not working. Saposin C is needed to activate glucocerebrosidase so it can break down a fatty substance called glucocerebroside inside cells. Without functioning saposin C, glucocerebroside builds up in certain cells, especially i
How is Atypical Gaucher disease due to saposin C deficiency inherited?
Atypical Gaucher disease due to saposin C deficiency follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.