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Related Experiment Videos

Muscle phosphoglycerate mutase (PGAM) deficiency: a second case.

N Bresolin, Y I Ro, M Reyes

    Neurology
    |August 1, 1983
    PubMed
    Summary

    Muscle phosphoglycerate mutase (PGAM) deficiency causes recurrent myoglobinuria. This study identifies a defect in the M subunit of PGAM, confirming its role in exercise-induced muscle damage and suggesting autosomal-recessive inheritance.

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    Area of Science:

    • Biochemistry
    • Exercise Physiology
    • Genetics

    Background:

    • Muscle phosphoglycerate mutase (PGAM) is crucial for glycolysis.
    • Recurrent myoglobinuria after exercise can indicate underlying metabolic myopathies.

    Observation:

    • A 17-year-old female presented with recurrent myoglobinuria, decreased muscle PGAM activity (6% of normal), and elevated muscle glycogen.
    • In vitro studies demonstrated impaired anaerobic glycolysis, correctable by adding purified PGAM.

    Findings:

    • Electrophoretic, heat lability, and mercury inhibition studies confirmed a defect in the M subunit of PGAM.
    • Intermediate PGAM activity levels in parents suggest autosomal-recessive inheritance of the deficiency.

    Implications:

    Related Experiment Videos

  • This research confirms the clinical and biochemical profile of PGAM deficiency.
  • Identifying the specific M subunit defect provides insights into the pathophysiology of exercise-induced myoglobinuria.
  • Understanding the genetic basis aids in diagnosing and counseling families affected by this rare metabolic myopathy.