Lafora disease (LD) is an autosomal recessive, fatal progressive myoclonus epilepsy caused by the abnormal buildup of insoluble glycogen, called Lafora bodies. Mutations in the gene encoding the protein laforin lead to LD. Laforin is a dual-specificity phosphatase with a carbohydrate-binding module. This enzyme is necessary for proper en metabolism, but its role in the development of LD glycog not yet fully understood.