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Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction
Published on: July 12, 2022
DNA extraction procedures meaningfully influence qPCR-based mtDNA copy number determination
Wen Guo1, Lan Jiang, Shalender Bhasin
1Department of Internal Medicine, Boston University School of Medicine, Section of Endocrinology, Boston, MA 02118, USA. wguo@bu.edu
Mitochondrion
|March 28, 2009
Summary
The method used to extract genomic DNA significantly impacts mitochondrial DNA (mtDNA) copy number measurements via quantitative real time PCR (qPCR). Different DNA extraction techniques yield varying mtDNA:nuclear DNA (nDNA) ratios, affecting experimental results.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Quantitative real time PCR (qPCR) is a standard method for determining cell mitochondrial DNA (mtDNA) copy number.
- This technique relies on the ratio of mtDNA gene copies to nuclear DNA (nDNA) gene copies within a genomic DNA sample.
Purpose of the Study:
- To investigate whether different genomic DNA extraction methods influence the measured mtDNA:nDNA ratio.
- To determine if these variations impact the accuracy of mtDNA copy number determination by qPCR.
Main Methods:
- Genomic DNA was extracted using organic solvent (phenol-chloroform-isoamyl alcohol) extraction and two distinct silica-based column methods.
- mtDNA:nDNA ratios were quantified using qPCR for each extraction method.
- The influence of extraction methods on experimental outcomes using mtDNA:nDNA ratios as endpoints was evaluated.
Main Results:
- Estimates of the mtDNA:nDNA ratio were not uniform across the different genomic DNA extraction methods.
- The choice of genomic DNA preparation method demonstrably altered experimental outcomes that rely on mtDNA:nDNA ratios.
Conclusions:
- Genomic DNA sample preparation is a critical factor that can meaningfully influence mtDNA copy number determination by qPCR.
- Researchers must consider the impact of DNA extraction methods on mtDNA copy number quantification.
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