DAG1 and congenital muscular dystrophy: UCMD seems to be the second most common type of congenital muscular dystrophy (CMD) in Europe (behind laminin α2 chain deficiency; OMIM 607855) and also in Japan (behind Fukuyama congenital muscular dystrophy; OMIM 253800, [53]) and Australia (behind α-dystroglycan glycosylation defects; [54]).