Abstract
Mitochondria are the powerhouses of eukaryotic cells. These organelles generate energy in the form of adenosine triphosphate (ATP) from carbohydrates, fats, and proteins, via oxidative phosphorylation. By virtue of possessing their own genetic material—mitochondrial DNA (mtDNA)-mitochondria are unique mammalian organelles. Normal human mtDNA is a 16,569 base-pair (bp), double-stranded, circular molecule (1). The molecules contain tightly compacted genes for 22 transfer (tRNAs), 13 polypeptides, and two ribosomal RNAs (rRNAs) Fig. 1). All 13 polypeptides are subunits of the oxidative phosphorylation system: seven belong to Complex I (NADHCoQ oxidoreductase), one to Complex III (CoQ-cytochrome c oxidoreductase), three to Complex IV (cytochrome c oxidase or COX), and two to Complex V (ATP synthase). These subunits are synthesized within the mitochondrion, where they are assembled together with a larger number of subunits encoded by the nuclear DNA (nDNA), that are synthesized in the cytoplasm and are transported into the mitochondrion (2). Approximately 1,000 mitochondrial polypeptides are encoded in nDNA. Complex II (succinate dehydrogenase-CoQ oxidoreductase), of which succinate dehydrogenase (SDH) is a component, is encoded entirely by nuclear genes; SDH thus serves as a marker for mitochondrial number and activity, independent of the mtDNA.
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Andreu, A.L., MartÍ, R., Hirano, M. (2003). Analysis of Human Mitochondrial DNA Mutations. In: Potter, N.T. (eds) Neurogenetics. Methods in Molecular Biology™, vol 217. Springer, Totowa, NJ. https://doi.org/10.1385/1-59259-330-5:185
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DOI: https://doi.org/10.1385/1-59259-330-5:185
Publisher Name: Springer, Totowa, NJ
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