Association of myostatin gene polymorphism with echocardiographic and muscular ultrasonographic measurements in Hungarian thoroughbreds horses.

The research investigates the influence of a specific polymorphism (variation) in the myostatin gene on muscle and heart characteristics in Thoroughbred horses. It found significant differences in muscle thickness, fascicle length, and three measurements of aortic diameter, potentially improving the understanding of genetic influences on Thoroughbred performance.

Methodology

• The study focused on a particular polymorphism within the myostatin gene (MSTN), known as g.66493737C/T.
• Three groups of 22 Thoroughbred horses each were studied, categorized based on the MSTN genotypes they possessed: C/C, C/T, and T/T.
• Using both echocardiography and muscular ultrasonography, various muscular and cardiac measurements were recorded.
• Levene’s test and multivariate analysis of variance were applied to check for homogeneity and to determine statistical differences in measured variables across genotypes.

Findings

• The study found significant differences in the thickness of the triceps brachii muscles and the fascicle length of the anconeus muscle between the C/C and T/T genotypes.
• In terms of cardiac variables, significant differences were found in the aortic diameter at the sinus of Valsalva (both during end-diastole and end-systole) and aortic diameter at the valve (during end-systole) between the two genotypes.
• The C/C genotype demonstrated higher values for all of the aforementioned measurements when compared to the T/T genotype, suggesting an increased cardiac output and aerobic capacity.

Significance

• The findings of this research support the hypothesis that the myostatin gene polymorphism influences muscle and cardiac characteristics in Thoroughbred horses.
• Understanding this association could lead to improved genetic exploitation strategies aimed at maximizing the athletic potential of Thoroughbred horses.