Mitochondrial encephalomyopathies: an update.
A genetic classification of the mitochondrial encephalomyopathies includes disorders due to defects of mitochondrial DNA (mtDNA) and disorders due to defects of nuclear DNA (nDNA). Recent progress in mtDNA-related diseases includes: (i) new pathogenic mutations in protein-coding genes, especially those encoding subunits of complex I (ND genes); (ii) the pathogenic nature of homoplasmic mutations, whose expression is regulated by environmental and genetic factors; (iii) increasing interest in the functional and pathophysiological role of haplotypes. Advances in mendelian mitochondrial diseases include: (i) new mutations in genes for complex I subunits; (ii) identification of new mutant ancillary proteins associated with complex IV and complex V deficiencies; (iii) better molecular understanding of disorders due to faulty intergenomic communication, which are associated with multiple mtDNA deletions, mtDNA depletion, or defects of mtDNA translation; (iv) the pathogenic role of alterations of the inner mitochondrial membrane phospholipid components, especially cardiolipin; (v) the emerging importance of defects in mitochondrial motility, fission, or fusion.
DiMauro
Salvatore
S
Department of Neurology, Columbia University Medical Center, College of Physicians and Surgeons, Room 4-420, 630 West 168th Street, New York, NY 10032, USA. sd12@columbia.edu
Hirano
Michio
M
D004272:DNA, Mitochondrial / Q000235:genetics*; D006801:Humans; D017237:Mitochondrial Encephalomyopathies / Q000235:genetics* / Q000503:physiopathology*; D009154:Mutation
D004272:DNA, Mitochondrial