POMGNT1 and muscular dystrophy-dystroglycanopathy, type A: Mutations in the POMGNT1 are responsible for several forms of α-DGPs such as Walker–Warburg syndrome (WWS, OMIM #253280, renamed MDDGA3)5, muscle–eye–brain disease (MEB, OMIM #253280, renamed MDDGA3)1, congenital muscular dystrophy with mental retardation (OMIM #613151, renamed MDDGB3)6, and limb girdle muscular dystrophy type 2 O (LGMD2O, OMIM #613157, renamed MDDGC3)7.