Alternative titles and symbols : Tarui disease; Gsd VII; Pfkm deficiency; Muscle phosphofructokinase deficiency;
Description : Glycogen storage disease VII is an autosomal recessive metabolic disorder characterized
clinically by exercise intolerance, muscle cramping, exertional myopathy, and compensated
hemolysis. Myoglobinuria may also occur. The deficiency of the muscle isoform of PFK
results in a total and partial loss of muscle and red cell PFK activity, respectively.
Raben and Sherman (1995) noted that not all patients with GSD VII seek medical care
because in some cases it is a relatively mild disorder.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the muscle phosphofructokinase gene (PFKM, 610681.0001);
Laboratory abnormalities : Muscle phosphofructokinase deficiency; Myoglobinuria with extreme exertion; Hyperuricemia; Increased bilirubin; Increased reticulocyte count; Decreased erythrocyte 2,3-diphosphoglycerate (2,3-DPG); No increase of muscle lactate with ischemic exercise testing;