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Current Molecular Medicine


ISSN (Print): 1566-5240
ISSN (Online): 1875-5666

Myophosphorylase Deficiency (Glycogenosis Type V McArdle Disease)

Author(s): S. DiMauro, A. L. Andreu, C. Bruno and G. M. Hadjigeorgiou

Volume 2, Issue 2, 2002

Page: [189 - 196] Pages: 8

DOI: 10.2174/1566524024605770

Price: $65


McArdle disease, one of the most common metabolic causes of exercise intolerance and recurrent myoglobinuria, is due to biochemical defects of the muscle isoform of glycogen phosphorylase. The gene for myophosphorylase (PGYM) is on chromosome 11, and 33 distinct mutations have been identified in patients from all over the world. In Caucasians, a nonsense mutation in exon 1 (R49X) is common enough to warrant screening of genomic DNA from blood before considering muscle biopsy. Other mutations are prevalent in different ethnic groups or are ”private“. Mutations are spread throughout the gene and there is no clear genotype:phenotype correlation. Highprotein diet and aerobic exercise are beneficial, and gene therapy appears promising.

Keywords: myophosphorylase deficiency glycogenosis type V, mcardle disease

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