Identification of Personality-Related Candidate Genes in Thoroughbred Racehorses Using a Bioinformatics-Based Approach Involving Functionally Annotated Human Genes.
Authors: Yokomori Tamu, Ohnuma Aoi, Tozaki Teruaki, Segawa Takao, Itou Takuya
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Personality traits in racehorses—such as flightiness, anxiety tolerance, and sociability—significantly influence training outcomes and safety, particularly when animals transition to second careers where they encounter less experienced handlers. Researchers cross-referenced a genomic database of 101 Thoroughbreds with established human personality genes (based on the Big Five personality framework) to identify orthologous equine genes, ultimately pinpointing 18 candidate genes harbouring 55 non-synonymous variants likely to meaningfully alter protein function. The team analysed allele frequencies and predicted functional impacts by examining changes in molecular weight and hydrophobicity between reference and mutated amino acids, discovering 15 genes with previously uncharacterised links to equine temperament. Whilst validation through integrated genetic and behavioural studies remains necessary, this bioinformatics approach offers a promising framework for objective personality evaluation in horses—particularly valuable for matching animals to suitable roles and identifying individuals requiring tailored management strategies. For practitioners, these findings suggest that genetic profiling could eventually complement traditional assessment methods to predict temperament-related challenges and inform evidence-based decisions about training intensity, retraining suitability, and long-term management protocols.
Read the full abstract on PubMed
Practical Takeaways
- •Genetic profiling of personality-related traits may eventually support objective personality evaluation in racehorses, improving training planning and reducing accident risk during retraining for second careers
- •Current findings are preliminary; genetic testing for personality prediction requires validation against behavioral data before practical application in training or selection programs
- •Understanding that equine personality has identifiable genetic components could inform approach to problem horses and justify investment in temperament assessment during career transitions
Key Findings
- •Identified 18 personality-related candidate genes in Thoroughbred horses orthologous to human Big Five personality trait genes
- •Discovered 55 variants with non-synonymous substitutions with high protein impact across these candidate genes
- •Found 15 newly identified genes potentially affecting equine personality with unclear functional associations
- •Developed bioinformatics methodology comparing allele frequencies and functional protein impacts (molecular weight and hydrophobicity changes)