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Mitochondrial myopathy of childhood associated with depletion of mitochondrial DNA. 1992
H J Tritschler, and
F Andreetta, and
C T Moraes, and
E Bonilla, and
E Arnaudo, and
M J Danon, and
S Glass, and
B M Zelaya, and
E Vamos, and
N Telerman-Toppet
Department of Neurology, Columbia University College of Physicians and Surgeons, New York, NY 10032.
We have studied five children with mitochondrial myopathy manifesting within or soon after the first year of life. Muscle biopsies showed ragged-red fibers and decreased respiratory chain activity. All five patients had a severe decrease (2 to 34% of normal) in the amount of muscle mitochondrial DNA (mtDNA). The depletion of mtDNA correlated with absence of mtDNA-encoded translation products and with loss of cytochrome c oxidase enzyme activity in individual muscle fibers. This mitochondrial myopathy of childhood illustrates one phenotypic expression of a novel pathogenetic mechanism in mitochondrial diseases, the specific depletion of mtDNA in affected tissues.
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