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MELAS: clinical phenotype and morphological brain abnormalities.

M Sparaco1, A Simonati, T Cavallaro

  • 1UO di Neurologia con SU, Azienda Ospedaliera, Benevento, Italy.

Acta Neuropathologica
|August 12, 2003
PubMed
Summary
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Mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) shows defective mitochondrial protein synthesis. This study confirms reduced respiratory chain subunit expression in brain tissue, explaining cognitive decline in MELAS patients.

Area of Science:

  • Neurology
  • Mitochondrial Biology
  • Pathology

Background:

  • Mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) is a maternally inherited disorder.
  • The A3243G mutation in mitochondrial DNA (mtDNA) is a common cause of MELAS.

Observation:

  • Autopsy findings from three MELAS patients with the A3243G mutation were analyzed.
  • Immunohistochemistry was used to examine respiratory chain subunit expression in brain tissue.
  • Mitochondrial abnormalities were focal and most prominent in the cerebral cortex.

Findings:

  • All cases exhibited reduced immunocytochemical staining for mtDNA-encoded respiratory chain subunits.
  • This confirms defective mitochondrial protein synthesis in MELAS.
  • Reduced immunoreactivity was observed in cerebral arterioles, but without clear correlation to lesion distribution.

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Implications:

  • The findings provide morphological evidence linking mitochondrial dysfunction to cognitive regression in MELAS.
  • Focal cerebral lesions in MELAS may be metabolic in origin.
  • Multiple pathogenetic mechanisms may contribute to stroke-like episodes in MELAS, potentially related to local ATP demand.