DAG1 and congenital muscular dystrophy: The current classification of CMD consists of three major categories: Ullrich type CMD (collagen VI-related dystrophy), merosin-deficient CMD (LAMA2-related dystrophy) and CMD with glycosylation defect in alpha-dystroglycan (alpha-dystroglycanopathy); as well as other minor subgroups, such as LMNA-related CMD (L-CMD), megaconial type CMD, CMD with integrin alpha-7 defect, and CMD without genetic diagnosis [1].