Molecular genetic studies in muscle phosphoglycerate mutase (PGAM-M) deficiency.
Phosphoglycerate mutase (PGAM; EC 2.7.5.3) catalyzes the interconversion of 2-phosphoglycerate and 3-phosphoglycerate in the glycolytic pathway. Hereditary muscle PGAM deficiency has been identified in 9 patients with myopathy. All patients had exercise intolerance and 6 had myoglobinuria. Seven of the 9 patients were African-Americans: 5 of them were homozygous for a nonsense mutation, TGG(Trp) to TAG at codon 78; 1 was a compound heterozygote for the nonsense mutation and a missense mutation, GAG(Glu) to GCG(Ala) at codon 89; and 1 could not be tested. The only 2 Caucasian patients, a brother and sister, were homozygous for a different missense mutation, CGG(Arg) to TGG(Trp) at codon 90. Despite the small number of patients identified, these findings indicate that there is a common mutation in African-Americans while there may be molecular genetic heterogeneity in other ethnic groups.
Tsujino
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H. Houston Merritt Clinical Research Center for Muscular Dystrophy and Related Diseases, Department of Neurology, Columbia-Presbyterian Medical Center, New York, NY 10032, USA.
Shanske
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S
Sakoda
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Toscano
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A
DiMauro
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D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D044383:Black People; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009132:Muscles / Q000201:enzymology*; D009154:Mutation; D010736:Phosphoglycerate Mutase / Q000172:deficiency* / Q000235:genetics*; D001741:Black or African American
D010736:Phosphoglycerate Mutase