Acta Neuropathologica

, Volume 76, Issue 2, pp 135–141 | Cite as

Variability in the activity of respiratory chain enzymes in mitochondrial myopathies

  • Y. Koga
  • I. Nonaka
  • N. Sunohara
  • R. Yamanaka
  • K. Kumagai
Regular Papers


Four patients with mitochondrial abnormality had multiple muscle biopsies at several year intervals during which respiratory chain enzyme activities were shown to be quite variable. In three patients, progression of the disease paralleled the decrease in respiratory chain enzyme activity. In one patient, the clinical and pathological findings improved with age as is seen in the benign infantile form of cytochromec oxidase (CCO) deficiency. The variability in these mitochondrial disorders may result from the varied proportions of normal and abnormal mitochondria in the muscle cells in which the mitochondria are said to be randomly replicated from numerous mitochondrial DNA copies.

Key words

Mitochondrial myopathy Respiratory chain enzyme Cytochromec oxidase NADH-coenzyme Q reductase Ragged-red fiber 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Y. Koga
    • 1
  • I. Nonaka
    • 1
  • N. Sunohara
    • 1
  • R. Yamanaka
    • 2
  • K. Kumagai
    • 3
  1. 1.Division of Ultrastructural ResearchNational Institute of Neuroscience, NCNPKodaira, TokyoJapan
  2. 2.Shida Municipal HospitalFujieda, ShizuokaJapan
  3. 3.Kanagawa Rehabilitation CenterAtsugi, KanagawaJapan

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