Dystroglycan 1 (DAG1)

Dystroglycan 1 (DAG1) is a central component of the dystrophin-associated glycoprotein complex that forms a transmembrane link between the extracellular matrix and the cytoskeleton, especially in skeletal muscle, heart, and brain. The gene encodes a precursor protein, proteolytically processed into two subunits: alpha-dystroglycan (extracellular, highly glycosylated, binds laminin and other matrix proteins) and beta-dystroglycan (transmembrane, linking extracellular alpha-dystroglycan to intracellular dystrophin and actin cytoskeleton). The dystroglycan complex provides structural integrity in muscle fibers, anchors the basement membrane, acts as a receptor for viruses such as lassa virus and lymphocytic choriomeningitis virus, and participates in neuromuscular junction formation, cell signaling, cell migration, and polarity. Mutations and abnormal glycosylation of dystroglycan are causally linked to various forms of muscular dystrophy and are implicated in cancer and nervous system development disorders. Dystroglycan is essential, as knockout in animal models leads to embryonic lethality due to defective tissue architecture.

Other names

DystroglycanAlpha-dystroglycanBeta-dystroglycanDAG1Alpha-DGBeta-DGDystrophin-associated glycoprotein 1cranin156DAGA3aAGRNRDAGLGMDR16MDDGA9MDDGC7MDDGC9

no direct drug mechanism established—primarily indirect involvement in disease pathophysiology