Overview
Disorder of protein O-glycosylation is a group of rare genetic conditions that affect how the body attaches sugar molecules (called glycans) to proteins through a process known as O-glycosylation. This sugar-coating process is essential for proteins to work properly throughout the body. When O-glycosylation does not function correctly, it can lead to problems in many different organs and systems, including the brain, muscles, eyes, skin, and skeleton. Symptoms vary widely depending on the specific gene affected and the type of O-glycosylation that is disrupted. Some forms primarily cause muscular dystrophy with brain and eye abnormalities (known as dystroglycanopathies), while others may cause skeletal problems, immune system issues, or developmental delays. Many patients experience intellectual disability, seizures, and muscle weakness from early in life. Because this is a group of disorders rather than a single disease, the severity ranges from mild to very severe. Treatment is currently supportive and focuses on managing individual symptoms. There is no single cure, but ongoing research into glycosylation biology is opening new avenues for potential therapies. Early diagnosis through genetic testing is important for guiding care and connecting families with appropriate specialists.
Key symptoms:
Muscle weaknessIntellectual disabilitySeizuresDelayed motor milestonesEye abnormalities or vision problemsBrain malformationsShort stature or growth delaysSkeletal abnormalitiesSkin problemsFeeding difficulties in infancyLow muscle tone (floppy baby)Heart defectsImmune system problemsJoint stiffness or contracturesSpeech and language delays
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for Disorder of protein O-glycosylation.
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Specialists
View all specialists →No specialists are currently listed for Disorder of protein O-glycosylation.
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 protein O-glycosylation.
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.What specific type of O-glycosylation disorder does my child have, and which gene is affected?,What symptoms should I watch for that would need urgent medical attention?,What therapies and interventions are recommended right now, and how often?,Are there any clinical trials or experimental treatments available for this specific subtype?,What is the expected course of this condition, and how might it change over time?,Should other family members be tested, and what are the chances of having another affected child?,Can you connect us with a multidisciplinary care team experienced with glycosylation disorders?
Common questions about Disorder of protein O-glycosylation
What is Disorder of protein O-glycosylation?
Disorder of protein O-glycosylation is a group of rare genetic conditions that affect how the body attaches sugar molecules (called glycans) to proteins through a process known as O-glycosylation. This sugar-coating process is essential for proteins to work properly throughout the body. When O-glycosylation does not function correctly, it can lead to problems in many different organs and systems, including the brain, muscles, eyes, skin, and skeleton. Symptoms vary widely depending on the specific gene affected and the type of O-glycosylation that is disrupted. Some forms primarily cause musc