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  • Title: Deficiency of alpha-dystroglycan in muscle-eye-brain disease.
    Author: Kano H, Kobayashi K, Herrmann R, Tachikawa M, Manya H, Nishino I, Nonaka I, Straub V, Talim B, Voit T, Topaloglu H, Endo T, Yoshikawa H, Toda T.
    Journal: Biochem Biophys Res Commun; 2002 Mar 15; 291(5):1283-6. PubMed ID: 11883957.
    Abstract:
    Alpha-dystroglycan is a component of the dystrophin-glycoprotein-complex, which is the major mechanism of attachment between the cytoskeleton and the extracellular matrix. Muscle-eye-brain disease (MEB) is an autosomal recessive disorder characterized by congenital muscular dystrophy, ocular abnormalities and lissencephaly. We recently found that MEB is caused by mutations in the protein O-linked mannose beta1,2-N-acetylglucosaminyltransferase (POMGnT1) gene. POMGnT1 is a glycosylation enzyme that participates in the synthesis of O-mannosyl glycan, a modification that is rare in mammals but is known to be a laminin-binding ligand of alpha-dystroglycan. Here we report a selective deficiency of alpha-dystroglycan in MEB patients. This finding suggests that alpha-dystroglycan is a potential target of POMGnT1 and that altered glycosylation of alpha-dystroglycan may play a critical role in the pathomechanism of MEB and some forms of muscular dystrophy.
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