POMGNT1 and neuromuscular disease caused by qualitative or quantitative defects of alpha-dystroglycan: Among dystroglycanopathies, good correlation between α-DG staining and disease course was demonstrated in only a few forms (POMT1, POMT2, and POMGnT1-mutated cases), and is absent in patients with mutations in FKRP and FKTN [39].