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Related Experiment Videos

Mitochondriopathy mimicking amyotrophic lateral sclerosis.

J Finsterer1

  • 1Neurological Department, KA Rudolfstiflung, Vienna, Austria. duarte@jet2web.cc

The Neurologist
|June 13, 2003
PubMed
Summary

Mitochondriopathy can mimic motor neuron disease symptoms. Genetic testing and muscle biopsy confirmed mitochondrial disease, leading to a revised diagnosis from amyotrophic lateral sclerosis (ALS) to mitochondriopathy.

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Area of Science:

  • Neurology
  • Genetics
  • Mitochondrial Biology

Background:

  • Mitochondriopathy is infrequently recognized as a mimic of motor neuron diseases.
  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting nerve cells in the brain and spinal cord.

Observation:

  • A patient initially diagnosed with familial ALS presented with motor neuron disease features, hypothyroidism, and sinus tachycardia.
  • Reevaluation revealed abnormal lactate stress testing and muscle biopsy findings of cytochrome c oxidase (COX) deficiency and abnormal mitochondria.
  • Genetic analysis identified mitochondrial DNA (mtDNA) substitutions in tRNA, ATPase-6, and cytochrome-b genes.

Findings:

  • The patient's clinical and electrophysiological presentation closely resembled ALS.

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  • Mitochondrial DNA analysis confirmed pathogenic mutations, indicating a primary mitochondrial disorder.
  • The diagnosis was revised from ALS to mitochondriopathy based on definitive genetic and pathological evidence.

    • Implications:

    • Mitochondriopathy should be considered in the differential diagnosis of patients presenting with an ALS phenotype.
    • Multisystem involvement and slow disease progression in suspected ALS cases warrant investigation for underlying mitochondriopathy.
    • This case highlights the importance of comprehensive diagnostic evaluation, including genetic and metabolic testing, for complex neurological presentations.