As controls for these analyses, we analysed myoblasts from two healthy controls and four patients with muscular diseases that have not previously been linked to glycosylation, namely CMS caused by mutations in DOK7, myopathy caused by mutations in MTND5, limb girdle muscular dystrophy type 2A (LGMD2A) caused by mutations in the CAPN3 gene encoding calpain-3, and Pompe disease caused by mutations in the GAA gene encoding acid maltase responsible for breaking down glycogen in lysosomes. Here, GAA is linked to muscular disease.