Sarcoglycans are a subcomplex of transmembrane proteins which are part of the dystrophin-glycoprotein complex. They are expressed in the skeletal, cardiac and smooth muscle. Although numerous studies have been conducted on the sarcoglycan subcomplex in skeletal and cardiac muscle, the manner of the distribution and localisation of these proteins along the nonjunctional sarcolemma is not clear [1]. This family contains alpha and epsilon members and represents the second domain which has an Ig-like fold.

1: Sarcoglycans in human skeletal muscle and human cardiac muscle: a confocal laser scanning microscope study. Anastasi G, Cutroneo G, Trimarchi F, Rizzo G, Bramanti P, Bruschetta D, Fugazzotto D, Cinelli MP, Soscia A, Santoro G, Favaloro A; Cells Tissues Organs 2003;173:54-63. PMID:12566627