Maternally inherited mitochondrial myopathy and myoclonic epilepsy

Howard S. Rosing, Linton C. Hopkins, Douglas C. Wallace, Charles M. Epstein, Karen Weidenheim

Research output: Contribution to journalArticle

144 Scopus citations

Abstract

A family is described with familial myoclonic epilepsy associated with mitochondrial myopathy. The disorder follows a maternal inheritance pattern consistent with a mitochondrial DNA (mtDNA) mutation. The large kindred permitted exclusion of autosomal dominant, recessive, and X‐linked patterns of transmission. Several characteristics of the inheriatnce and variability of expression within the pedigree are consistent with recently acquired knowledge about the genetics of human mtDNA. The clilnical spectrum of disease is compatible with a proportionality model of mutant and wild‐type mt DNAs. Muscle biopsies of affected patients showed an increased number of abnormal muscle mitochondria. Serum levels of pyruvate or and lactate were elevated. The most severely affected pateint had constant myoclonic jerking, dementia, ataxia, spasticity, hearing loss, and hopoventilation. Cerebral dysfuntion in patients with mild involvement waas marked by prominent photic driving seen on electroencephalograms and high‐amplitude visual and somatosensory evoked responses but no myoclonus, ataxia, or dementia. The individual clinical features of the disease worsen over time for all patients; however, mildly affected patients have not become moderately afftected and moderately affected patients have not become severely affected.

Original languageEnglish (US)
Pages (from-to)228-237
Number of pages10
JournalAnnals of Neurology
Volume17
Issue number3
DOIs
StatePublished - Mar 1985

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

Fingerprint Dive into the research topics of 'Maternally inherited mitochondrial myopathy and myoclonic epilepsy'. Together they form a unique fingerprint.

  • Cite this

    Rosing, H. S., Hopkins, L. C., Wallace, D. C., Epstein, C. M., & Weidenheim, K. (1985). Maternally inherited mitochondrial myopathy and myoclonic epilepsy. Annals of Neurology, 17(3), 228-237. https://doi.org/10.1002/ana.410170303