GM1 Ganglioside Storage Syndrome

GM1 gangliosidosis is an inherited lysosomal storage disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord. Some researchers classify this condition into three major types based on the age at which signs and symptoms first appear. The three types include: classic infantile (type 1), juvenile (type 2), and adult onset or chronic (type 3). Although the three types differ in severity, their features can overlap significantly. Because of this overlap, other researchers believe that GM1 gangliosidosis represents a continuous disease spectrum instead of three distinct types. This condition is caused by mutations in the GLB1 gene and is inherited in an autosomal recessive fashion.