Glycogen storage myopathies

The glycogen storage myopathies are caused by enzyme defects in the glycoge nolytic or in the glycolytic pathway affecting skeletal muscle alone or in conjunction with other tissues. The authors review recent findings in this area, including a new entity, aldolase deficiency, and the wealth of molecu lar genetic data that are rapidly accumulating. Despite this progress, geno type-phenotyp3 correlations are still murky in most glycogen storage myopat hies.