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Updated: Jun 15, 2025
09:15
Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction
Published on: July 12, 2022
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Association between mitochondrial DNA copy number and production traits in pigs
Eduard Molinero1,2, Ramona N Pena1,2, Joan Estany1,2
1Departament de Ciència Animal, Universitat de Lleida, Lleida, Spain.
Summary
Lower mitochondrial DNA copy number in pigs is linked to improved carcass leanness and feed efficiency. This study explored mitochondrial DNA copy number and its genetic basis in relation to pig production traits.
Area of Science:
- Animal Genetics
- Cellular Biology
- Livestock Production
Background:
- Mitochondria regulate cellular energy metabolism.
- Mitochondrial DNA copy number (mtDNA_CN) reflects mitochondrial quantity and activity.
- Understanding mtDNA_CN's role in livestock is crucial for improving production traits.
Purpose of the Study:
- To assess the impact of mtDNA_CN and mitochondrial haploblocks on pig production traits.
- To identify the genetic underpinnings of mtDNA_CN variation in pigs.
Main Methods:
- Collected performance data from 234 pigs.
- Extracted DNA from skeletal muscle for whole-genome sequencing.
- Determined mtDNA_CN and analyzed correlations with production traits.
Main Results:
- Muscle mtDNA_CN positively correlated with backfat thickness and negatively with loin thickness.
- Pigs with lower mtDNA_CN exhibited greater loin thickness and lean percentage.
- Lower mtDNA_CN associated with enhanced feed efficiency and higher meat ultimate pH.
Conclusions:
- Reduced mitochondrial activity, indicated by lower mtDNA_CN, may improve feed efficiency in pigs.
- Genomic regions associated with mtDNA_CN suggest a genetic basis for this trait.
- Further research is needed to confirm the direct impact of these genetic regions on production traits.
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