Abstract
X-LINKED recessive Duchenne muscular dystrophy (DMD) is caused by the absence of dystrophin, a membrane cytoskeletal protein1,2. Dystrophin is associated with a large oligomeric com-plex of sarcolemmal glycoproteins3–10. The dystrophin–glycoprotein complex has been proposed to span the sarcolemma to provide a link fyetween the subsarcolemmal cytoskeleton and the extracellular matrix component, laminin7,9. In DMD, the absence of dystrophin leads to a large reduction in all of the dystrophin-associated proteins4,9,10. We have investigated the possibility that a deficiency of a dystrophin-associated protein could be the cause of severe childhood autosomal recessive mus-cular dystrophy (SCARMD) with a DMD-like phenotype11–14. Here we report the specific deficiency of the 50K dystrophin-associated glycoprotein (Mr 50,000) in sarcolemma of SCARMD patients. Therefore, the loss of this glycoprotein is a common denominator of the pathological process leading to muscle cell necrosis in two forms of muscular dystrophy, DMD and SCARMD.
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Matsumura, K., Tomé, F., Collin, H. et al. Deficiency of the 50K dystrophin-associated glycoprotein in severe childhood autosomal recessive muscular dystrophy. Nature 359, 320–322 (1992). https://doi.org/10.1038/359320a0
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DOI: https://doi.org/10.1038/359320a0
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