Overview
Glycoproteinosis is a group of rare inherited metabolic diseases that belong to the family of lysosomal storage disorders. In these conditions, the body lacks certain enzymes needed to break down glycoproteins — molecules made of sugars attached to proteins. When these glycoproteins cannot be properly broken down, they build up inside cells, particularly in a compartment called the lysosome. This accumulation damages cells and tissues throughout the body over time. Glycoproteinoses include several specific conditions such as alpha-mannosidosis, beta-mannosidosis, fucosidosis, sialidosis, galactosialidosis, aspartylglucosaminuria, and Schindler disease. Each is caused by a deficiency of a different enzyme involved in glycoprotein breakdown. Common symptoms across these disorders can include intellectual disability, coarse facial features, skeletal abnormalities, enlarged liver and spleen, hearing loss, and vision problems. The severity and age of onset vary depending on the specific type. Treatment is mostly supportive, focusing on managing symptoms and improving quality of life. For some types, such as alpha-mannosidosis, enzyme replacement therapy has become available. Bone marrow transplantation has also been tried in certain cases with variable results. Research into gene therapy and other novel treatments is ongoing. Early diagnosis through genetic testing and enzyme assays is important to begin supportive care as soon as possible.
Key symptoms:
Intellectual disability or developmental delayCoarse facial featuresEnlarged liver and spleenSkeletal abnormalities and joint stiffnessHearing lossVision problemsRecurrent infectionsDifficulty with speech and languageMuscle weaknessSeizuresShort statureSkin changes or thickeningBehavioral problemsProgressive loss of previously learned skills
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 Glycoproteinosis.
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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 Glycoproteinosis.
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 type of glycoproteinosis does my child or family member have, and what gene is affected?,What is the expected course of this disease, and how quickly might symptoms progress?,Is enzyme replacement therapy or bone marrow transplantation an option for this specific type?,What therapies and support services should we start right away?,Are there clinical trials or experimental treatments we should consider?,What should we watch for that would require emergency medical attention?,Should other family members be tested, and what are the chances of having another affected child?
Common questions about Glycoproteinosis
What is Glycoproteinosis?
Glycoproteinosis is a group of rare inherited metabolic diseases that belong to the family of lysosomal storage disorders. In these conditions, the body lacks certain enzymes needed to break down glycoproteins — molecules made of sugars attached to proteins. When these glycoproteins cannot be properly broken down, they build up inside cells, particularly in a compartment called the lysosome. This accumulation damages cells and tissues throughout the body over time. Glycoproteinoses include several specific conditions such as alpha-mannosidosis, beta-mannosidosis, fucosidosis, sialidosis, gala
How is Glycoproteinosis inherited?
Glycoproteinosis follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.