A group of autosomal recessive lysosomal storage disorders marked by the accumulation of gangliosides. They are caused by impaired enzymes or defective cofactors required for normal ganglioside degradation in the lysosomes. Gangliosidoses are classified by the specific ganglioside accumulated in the defective degradation pathway. The disease is gangliosidosis (Monarch Disease Ontology id MONDO_0017719).