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A rare genetic glycogen storage disorder with characteristics of polyglucosan accumulation in various tissues, manifesting with progressive proximal muscle weakness in the lower limbs and rapidly progressive usually dilated cardiomyopathy. Hepatic involvement and growth retardation may be associated. Early-onset immunodeficiency and auto-inflammation presenting with recurrent bacterial infections have also been reported. Caused by homozygous or compound heterozygous mutation in the RBCK1 gene on chromosome 20p13.
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