Skeletal muscle mitochondrial bioenergetics and associations with myostatin genotypes in the Thoroughbred horse.
- Journal Article
Summary
This research explored the impact of myostatin (MSTN) genetic variations on the mitochondrial characteristics in horse muscle tissue. The study demonstrated a significant link between MSTN variations and mitochondrial activity, and proposed this may be potential area of focus for nutritional supplementation.
Objective of the Research
The study aimed to explore the possible influence of myostatin (MSTN) variation on mitochondrial features in the skeletal muscles of untrained Thoroughbred horses. The hypothesis was based on the previous reports suggesting an association between MSTN gene variation and several physical attributes in horses, such as their capability for racing over different distances, body composition, and skeletal muscle fiber composition.
Research Methodology
- The research was conducted on whole muscle biopsies from the gluteus medius of 82 untrained Thoroughbred horses, aged 21 ± 3 months.
- Researchers analyzed the mitochondrial abundance and skeletal muscle fibre types in these samples.
- They specifically looked for the presence of MSTN genotypes, including the C-allele of SNP g.66493737C>T and the SINE insertion 227 bp polymorphism.
Findings of the Research
- The skeletal muscle fibre type proportions were found to be significantly different among the horses, depending on their MSTN genotype.
- Notably, mitochondrial content was found to be significantly lower in horses carrying the combined presence of the C-allele and the SINE insertion polymorphism.
- Upon evaluation of mitochondrial complex activities, they exhibited higher combined mitochondrial complex I+III and II+III activities in horses with the C-allele and the SINE insertion polymorphism.
- The team also observed decreased gene regulations within two coenzyme Q (CoQ) biosynthesis pathway genes (COQ4 and ADCK3) in the TT/NN horses, indicating decreased coenzyme Q levels in them.
Conclusions and Implications
- The results of this study reveal several mitochondrial phenotypes associated with differences in MSTN genotype in untrained Thoroughbred horses.
- The findings suggest that dietary supplementation with coenzyme Q (CoQ) may assist in the restoration of coenzyme Q activity in horses carrying certain MSTN genotypes, particularly TT/NN genotype horses. This could eventually contribute to the improvement of the horses’ physical performance.
Cite This Article
Publication
Researcher Affiliations
- UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland.
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, Dublin 2, Ireland.
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, Dublin 2, Ireland.
- UCD School of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.
- UCD School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland.
MeSH Terms
- Age Factors
- Animals
- Energy Metabolism
- Female
- Genotype
- Horses / genetics
- Horses / metabolism
- Male
- Mitochondria, Muscle / metabolism
- Muscle, Skeletal / metabolism
- Myostatin / genetics
- Phenotype
- Physical Conditioning, Animal
- Polymorphism, Single Nucleotide
- Short Interspersed Nucleotide Elements
Conflict of Interest Statement
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