Coloration in Equine: Overview of Candidate Genes Associated with Coat Color Phenotypes.
Authors: Liu Xiaotong, Peng Yongdong, Zhang Xinhao, Wang Xinrui, Chen Wenting, Kou Xiyan, Liang Huili, Ren Wei, Khan Muhammad Zahoor, Wang Changfa
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary: Equine Coat Color Genetics Coat colour variation in horses and donkeys is fundamentally controlled by the ratio of eumelanin to pheomelanin, regulated through a complex interplay of genetic factors that modern sequencing technologies have now begun to illuminate. This 2024 review synthesises current knowledge of key candidate genes—particularly MC1R, TYR, MITF, ASIP, and KIT—that govern melanin biosynthesis and pigmentation distribution, providing clarity on the molecular mechanisms underlying the full spectrum of equine coat phenotypes. Understanding these genetic pathways has direct implications for selective breeding programmes, as coat colour genetics are increasingly recognised as linked to disease susceptibility in certain breeds; for instance, associations exist between specific colour alleles and conditions affecting vision, sun sensitivity, and metabolic function. For farriers, veterinarians, and breeding professionals, this genetic framework enables more informed breeding decisions that optimise both aesthetic traits and health outcomes, whilst also improving our capacity to predict colour inheritance patterns with greater accuracy. The practical value lies in moving beyond empirical observation of coat colour to a genotype-informed approach that can mitigate inherited health risks whilst maintaining desired phenotypic characteristics.
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Practical Takeaways
- •Understanding the genetic basis of coat color can inform selective breeding programs to enhance both aesthetic traits and health outcomes in equine operations.
- •Knowledge of coat color-associated genes may help identify predisposition to certain equine diseases, enabling preventive management strategies.
- •Genomic testing for key coat color genes could become a practical tool for breeders seeking to predict phenotypes and health profiles in offspring.
Key Findings
- •Coat color variation in equids is primarily determined by eumelanin and pheomelanin balance, regulated by multiple genetic factors.
- •Five key candidate genes (MC1R, TYR, MITF, ASIP, KIT) have been identified as major regulators of coat color variation in horses and donkeys.
- •Coat color phenotypes are linked to selective breeding strategies and susceptibility to specific equine diseases.
- •Advances in genomic and sequencing technologies have enabled clarification of the genetic basis underlying diverse equine coat color phenotypes.