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Ophthalmologic manifestations in MELAS syndrome
1Department of Neurology, Chang Gung Memorial Hospital, Chang Gung Medical College, Taipei, Taiwan, Republic of China.
Archives of Neurology
|September 1, 1993
Summary
This study details a 15-year-old boy with MELAS and CPEO, highlighting ophthalmoplegia as a potential symptom of MELAS syndrome. The findings link a specific mitochondrial DNA mutation to these complex neurological and muscular conditions.
Area of Science:
- Neurology
- Genetics
- Mitochondrial Diseases
Background:
- Mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and chronic progressive external ophthalmoplegia (CPEO) are distinct mitochondrial disorders.
- Co-occurrence of MELAS and CPEO is rare, presenting complex diagnostic challenges.
Observation:
- A 15-year-old male presented with symptoms of both MELAS and CPEO, including visual disturbances, hearing impairment, epilepsy, and hemiparesis.
- Neuroimaging revealed characteristic stroke-like lesions in the parieto-occipital and frontal lobes.
- Laboratory findings confirmed lactic acidosis and mitochondrial myopathy with ragged-red fibers.
Findings:
- Genetic analysis identified a specific mutation (A to G transition at nucleotide position 3243) in the mitochondrial tRNA(Leu) gene.
- The patient exhibited significant external ophthalmoplegia and ptosis, symptoms typically associated with CPEO.
Implications:
- This case suggests that ophthalmoplegia may be an underrecognized clinical manifestation of MELAS syndrome.
- Understanding this genotype-phenotype correlation can improve diagnostic accuracy and patient management for mitochondrial disorders.
- Further research is warranted to elucidate the mechanisms linking MELAS mutations to ophthalmoplegia.