Disruption of the purine nucleotide cycle. A potential explanation for muscle dysfunction in myoadenylate deaminase deficiency.

A patient with symptoms of easy fatigability, postexercise myalgias, and delayed recovery of muscle strength after activity is described. Skeletal muscle from this patient had <1.0% normal myoadenylate deaminase activity and NH(3) was not released from muscle after ischemic exercise. In association with this enzyme deficiency, exercise led to a >90… CONTINUE READING