Together with dys-1 and hlh-1, participates in a common muscular function. Component of the dystrophin glycoprotein complex (DGC) (PubMed:10996789). Interacts with zyx-1 (PubMed:18094057). Expressed in muscles of the head, body wall and vulva (PubMed:10996789, PubMed:18094057). In some animals, weaker expression is observed in the intestinal muscles (at protein level) (PubMed:10996789). Isoform a is expressed in lateral neurons SDQL and SDQR (PubMed:18094057). Mutants synergistically exhibit progressive myopathy. Overexpression of dyc-1 in dys-1 and hlh-1 double mutants, delays but does not prevent the progression of myopathy due to reduction in the proportion of abnormal muscles (PubMed:10996789). Also, reduces the locomotion and egg laying defects (PubMed:10996789). RNAi-mediated knock-down of isoform b induces a dys-1-like behavioral phenotype consisting of hyperactivity, exagerated head bending and a tendency to hypercontract (PubMed:18094057).