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- Malfatti, Edoardo, et al.
(author)
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A New Muscle Glycogen Storage Disease Associated with Glycogenin-1 Deficiency
- 2014
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In: Annals of Neurology. - : Wiley. - 0364-5134. ; 76:6, s. 891-898
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Journal article (peer-reviewed)abstract
- We describe a slowly progressive myopathy in 7 unrelated adult patients with storage of polyglucosan in muscle fibers. Genetic investigation revealed homozygous or compound heterozygous deleterious variants in the glycogenin-1 gene (GYG1). Most patients showed depletion of glycogenin-1 in skeletal muscle, whereas 1 showed presence of glycogenin-1 lacking the C-terminal that normally binds glycogen synthase. Our results indicate that either depletion of glycogenin-1 or impaired interaction with glycogen synthase underlies this new form of glycogen storage disease that differs from a previously reported patient with GYG1 mutations who showed profound glycogen depletion in skeletal muscle and accumulation of glycogenin-1. Ann Neurol 2014;76:891-898
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