High Frequencies of TNC and COL5A1 Genotypes Associated With Low Risk for Superficial Digital Flexor Tendinopathy in Greek Indigenous Horse Breeds Compared With Warmblood Horses.

This study investigates the prevalence of three specific genetic variants associated with tendinopathy, a common musculoskeletal disorder in horses, in three indigenous Greek horse breeds compared with a population of Warmblood horses. The results reveal a higher frequency of low-risk genotypes for tendinopathy in the Greek breeds, reinforcing previous findings of these breeds’ greater tolerance to such disorders.

Research Overview

• The researchers investigated the role of specific genes in the susceptibility to tendinopathy, a prevalent type of musculoskeletal disorder in horses.
• The basic motive of the research was to understand why indigenous Greek horse breeds seem to be more resilient to tendinopathies compared to warmblood horses, a sport and race breed.

Genetic Associations with Tendinopathy

• The investigation focused on two specific genes, tenascin-C (TNC) and collagen type 5 α-1 (COL5A1), which have been related to increased susceptibility to tendinopathy in horses.
• The researchers pinpointed three specific genetic variants (genotypes) associated with increased risk of developing the disorder.

Study Design

• The comparative analysis focused on three indigenous Greek horse populations, the pinia (peneia) breed, the Messara breed, and the nondescript Macedonian pacer.
• The frequencies of the three genotype variants in these breeds were compared with those in a population of warmblood horses, a breed generally more prone to tendinopathies.

Key Findings

• The findings indicated a higher frequency of the low-risk genotypes for tendinopathy amongst the Greek horse breeds.
• This implies that these breeds are genetically less likely to develop such disorders compared to the warmbloods, a fact that aligns with previous observations.
• Additionally, two previously undiscovered genetic variants were found, one of which may also be related to tendinopathy risk.

Conclusion and Future Implications

• The results reasserted previous findings associating specific genetic variants with tendinopathy risk in horses.
• However, they also underscored the potential of the Greek horse breeds as a genetic resource that could be utilized in selective breeding schemes.
• This could help in decreasing the prevalence of tendinopathies in genetically improved breeds and thus potentially contribute to better animal welfare in the equine industry.