Enables laminin-1 binding activity. Involved in several processes, including calcium-dependent cell-matrix adhesion; cellular response to cholesterol; and nervous system development. Located in several cellular components, including basolateral plasma membrane; costamere; and focal adhesion. Part of dystrophin-associated glycoprotein complex. Is active in glutamatergic synapse and postsynaptic cytosol. Used to study myocardial infarction. Biomarker of muscular atrophy; primary biliary cholangitis; and type 2 diabetes mellitus. Human ortholog(s) of this gene implicated in Duchenne muscular dystrophy; autosomal recessive limb-girdle muscular dystrophy type 2D; autosomal recessive limb-girdle muscular dystrophy type 2P; congenital muscular dystrophy-dystroglycanopathy type A9; and inclusion body myositis. Orthologous to human DAG1 (dystroglycan 1). [provided by Alliance of Genome Resources, Apr 2022]