mtDNA copy number was determined as described, by calculating the ratio of mtDNA to nuclear DNA (ACTB) per cell in relation to standard curves of known concentrations, ranging from 10−1 ng/μL to 10−8 ng/μL [42 (link)]. Quantitative PCR was performed on a Rotor Gene RG-3000 (Corbett Research, Mortlake, Australia), with RotorGene software (v6.0) used for data acquisition and analysis. Standard curves were used with a correlation coefficient of R2 > 0.9 and an efficiency coefficient of R > 0.95. Mitochondrial DNA copy number per cell was calculated as follows:
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