{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T12:33:55Z","timestamp":1791203635403,"version":"4.2.0"},"reference-count":107,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2005,6,2]],"date-time":"2005-06-02T00:00:00Z","timestamp":1117670400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2005,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The original sarcoglycan (SG) complex has four subunits and comprises a subcomplex of the dystrophin\u2013dystrophin\u2010associated protein complex. Each SG gene has been shown to be responsible for limb\u2010girdle muscular dystrophy, called sarcoglycanopathy (SGP). In this review, we detail the characteristics of the SG subunits, and the mechanism of the formation of the SG complex and various molecules associated with this complex. We discuss the molecular mechanisms of SGP based on studies mostly using SGP animal models. In addition, we describe other SG molecules, \u03f5\u2010 and \u03b6\u2010SGs, with special reference to their expression and roles in vascular smooth muscle, which are currently in dispute. We further consider the maternally imprinted nature of the \u03f5\u2010SG gene. Finally, we stress that the SG complex cannot work by itself and works in a larger complex system, called the transverse fixation system, which forms an array of molecules responsible for various muscular dystrophies. 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