gangliosidosis, domestic cat GM2 gangliosidosis, domestic cat https://github.com/monarch-initiative/mondo/issues/7271 MONDO:1012603 OMIA:000403-9685 gangliosidosis, GM2, generic, domestic cat A lysosomal storage disease that occurs in cats in which there is a buildup of GM2 gangliosides in tissues due to the lack of the enzyme hexosaminidase. It is characterised by progressive neuromuscular dysfunction and impaired growth from an early age.