GM2 gangliosidosis

GM2 gangliosidosis is a group of rare inherited metabolic diseases in which the body cannot properly break down a fatty substance called GM2 ganglioside. This substance builds up in nerve cells of the brain and spinal cord, causing progressive damage to the nervous system. The group includes three related conditions: Tay-Sachs disease (caused by a deficiency of the enzyme hexosaminidase A), Sandhoff disease (caused by a deficiency of both hexosaminidase A and B), and the AB variant (caused by a deficiency of the GM2 activator protein). All three forms share similar symptoms but are caused by different gene defects. The most common and severe form begins in infancy, typically between 3 and 6 months of age. Affected babies may appear normal at birth but gradually lose skills they had already learned, such as sitting, crawling, and turning over. Symptoms include an exaggerated startle response to loud noises, progressive weakness, loss of vision and hearing, seizures, and intellectual decline. A characteristic cherry-red spot may be seen in the back of the eye during an exam. There are also later-onset forms that appear in childhood, adolescence, or even adulthood. These tend to progress more slowly and may cause muscle weakness, difficulty with coordination and balance, speech problems, and psychiatric symptoms. Currently, there is no cure for GM2 gangliosidosis. Treatment focuses on managing symptoms and providing comfort and supportive care. Research into gene therapy, substrate reduction therapy, and enzyme replacement therapy is ongoing and offers hope for future treatments.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Bring these to your next appointment

• Q1.What specific type of GM2 gangliosidosis does my child have, and what does this mean for the expected disease course?,Are there any clinical trials or experimental treatments that my child might be eligible for?,What symptoms should I watch for that would require emergency medical attention?,When should we consider a feeding tube or other supportive interventions?,What palliative care and support services are available for our family?,Should other family members be tested as carriers, and what are the options for future pregnancies?,How often should we schedule follow-up visits, and which specialists should be involved in my child's care?

Common questions about GM2 gangliosidosis

Related conditions

Other rare diseases commonly researched alongside GM2 gangliosidosis.

• Gaucher disease→
• GM1 gangliosidosis→
• Sandhoff disease→
• Tay-Sachs disease→