Late-onset encephalopathy associated with a C11777A mutation of mitochondrial DNA

Neurology. 2003 Apr 22;60(8):1357-9. doi: 10.1212/01.wnl.0000055869.99975.4b.


A 67-year-old man presented with cognitive deficits, status epilepticus, left hemiparesis, and severe lactic acidosis. Respiratory chain enzyme analysis of skeletal muscle revealed a defect in complex I activity, associated with a heteroplasmic C11777A mutation in the mitochondrial ND4 gene. This case is remarkable not only because of the late onset of symptoms, but because this mutation affects the identical ND4 codon as the G11778A mutation that causes Leber hereditary optic neuropathy.

Publication types

  • Case Reports
  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acidosis, Lactic / genetics
  • Age of Onset
  • Aged
  • Amino Acid Substitution
  • Cerebral Infarction / genetics
  • Codon / genetics
  • DNA, Mitochondrial / genetics*
  • Electron Transport Complex I / genetics*
  • Humans
  • Male
  • Mitochondria, Muscle / chemistry
  • Mitochondrial Encephalomyopathies / epidemiology
  • Mitochondrial Encephalomyopathies / genetics*
  • Mutation, Missense
  • Optic Atrophy, Hereditary, Leber / genetics
  • Phenotype
  • Point Mutation
  • Protein Subunits / genetics
  • Structure-Activity Relationship


  • Codon
  • DNA, Mitochondrial
  • Protein Subunits
  • Electron Transport Complex I