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Related Experiment Videos

An abnormal exercise test response revealing a respiratory chain complex III deficiency

B Mousson1, J M Collombet, R Dumoulin

  • 1Laboratoire de Biochimie Pédiatrique, Hôpital Debrousse, Lyon, France.

Acta Neurologica Scandinavica
|June 1, 1995
PubMed
Summary

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This study identifies a mitochondrial myopathy in a patient with exercise intolerance. A deficiency in complex III activity was found, explaining the muscle

Area of Science:

  • Biochemistry
  • Exercise Physiology
  • Neuromuscular Disorders

Background:

  • Mitochondrial myopathies are a group of inherited disorders affecting muscle energy production.
  • Exercise intolerance is a common symptom, often linked to impaired aerobic metabolism.

Observation:

  • A 29-year-old male presented with progressive exertional muscle intolerance since childhood.
  • Incremental exercise testing revealed reduced maximal oxygen consumption and an early anaerobic threshold.
  • Metabolic investigations showed hyperlactataemia and an elevated lactate/pyruvate ratio at rest and post-meal.

Findings:

  • Muscle biopsy revealed characteristic red granular deposits in type 1 fibers.
  • Biochemical analysis demonstrated a significant deficiency in ubiquinol cytochrome c reductase (Complex III) activity within the mitochondrial respiratory chain.

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Implications:

  • This case highlights Complex III deficiency as a cause of mitochondrial myopathy presenting with exercise intolerance.
  • Understanding specific enzyme defects is crucial for accurate diagnosis and potential therapeutic strategies in mitochondrial diseases.