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Supranuclear eye movement dysfunction in mitochondrial myopathy with tRNA(LEU) mutation

S R Gupta1, M Brigell, M Gujrati

  • 1Department of Neurology, VA Hines Hospital, IL 60141, USA.

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society
|March 1, 1995
PubMed
Summary

Mitochondrial myopathy, a genetic disorder, can cause eye movement abnormalities. This study suggests supranuclear dysfunction may explain ophthalmoparesis in patients with the tRNA(LEU) 3243 mutation.

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Area of Science:

  • Neurology
  • Genetics
  • Ophthalmology

Background:

  • Mitochondrial myopathies are a group of genetic disorders affecting muscle energy production.
  • The tRNA(LEU) mutation at nucleotide 3243 is a common cause of mitochondrial myopathy, often associated with neurological deficits.
  • Ophthalmoparesis, or impaired eye movement, is a frequent but poorly understood symptom in these conditions.

Observation:

  • A patient with biopsy-proven mitochondrial myopathy and the specific tRNA(LEU) 3243 mutation presented with restricted voluntary eye movements.
  • Detailed eye movement recordings showed reduced saccadic velocities, impaired smooth pursuit gain, and abnormal vestibulo-ocular reflex in the affected patient.
  • His clinically asymptomatic brother, carrying the same mutation, exhibited subtle, direction-specific saccadic abnormalities but normal smooth pursuit and vestibulo-ocular reflexes.

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Findings:

  • The affected patient displayed significant deficits in saccadic velocity, smooth pursuit, and vestibulo-ocular reflex function.
  • Subtle saccadic abnormalities were detected even in the asymptomatic sibling, suggesting early or subclinical neurophysiological changes.
  • These findings highlight a spectrum of eye movement dysfunction associated with the mitochondrial tRNA(LEU) 3243 mutation.

Implications:

  • The study suggests that supranuclear dysfunction is a key mechanism contributing to ophthalmoparesis in mitochondrial myopathies.
  • Eye movement analysis can serve as a sensitive tool for detecting neurological involvement in mitochondrial diseases, even in asymptomatic individuals.
  • Understanding these mechanisms may lead to improved diagnostic approaches and targeted therapies for mitochondrial myopathies.