The Role of Alpha-Dystrobrevin in Striated Muscle

Muscular dystrophies are a group of diseases that primarily affect striated muscle and are characterized by the progressive loss of muscle strength and integrity. Major forms of muscular dystrophies are caused by the abnormalities of the dystrophin glycoprotein complex (DGC) that plays crucial roles as a structural unit and scaffolds for signaling molecules at the sarcolemma. alpha-Dystrobrevin is a component of the DGC and directly associates with dystrophin. alpha-Dystrobrevin also binds to intermediate filaments as well as syntrophin, a modular adaptor protein thought to be involved in signaling. Although no muscular dystrophy has been associated within mutations of the alpha-dystrobrevin gene, emerging findings suggest potential significance of alpha-dystrobrevin in striated muscle. This review addresses the functional role of alpha-dystrobrevin in muscle as well as its possible implication for muscular dystrophy.