DAG1 and muscular dystrophy: Abnormal glycosylation of dystroglycan has been shown to associate with numerous muscular dystrophies such as Fukuyama congenital muscular dystrophy, Walker–Warburg syndrome, muscle–eye–brain disease, congenital muscular dystrophy types 1C and 1D, and autosomal recessive limb-girdle muscular dystrophy type 2 (Kobayashi et al., 1998; Brockington et al., 2001a, 2001b; Longman et al., 2003; Toda et al., 2003; Barresi and Campbell, 2006; Hara et al., 2011; Gao and McNally, 2015).