Crypto-tobiano horses in Hucul breed

Stachurska, Anna; Jansen, P. A.

doi:10.17221/7905-cjas

Cited by 8 publications

(8 citation statements)

References 25 publications

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“…The phenotype of these horses probably represents the tail of the natural distribution of total depigmented area characteristic of the unique reduction in melanocyte migration for each of these alleles. Previous work observed the production of foals with phenotypes typical of the TO allele from parents with a TO allele but a minimal white phenotype (Stachurska & Jansen 2015). Thus, these horses probably possess genetic value as producers of future spotted foals, although on the surface they do not fit the visual description of a Regular Registry horse.…”

Section: Resultsmentioning

confidence: 93%

Impact of white‐spotting alleles, including W20, on phenotype in the American Paint Horse

et al. 2020

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Summary The American Paint Horse Association (APHA) records pedigree and performance information for their breed, a stock‐type horse valued as a working farm or ranch horse and as a pleasure horse. As the name implies, the breed is also valued for its attractive white‐spotting patterns on the coat. The APHA utilizes visual inspections of photographs to determine if coat spotting exceeds threshold anatomical landmarks considered characteristic of desirable patterns. Horses with sufficient white patterning enter the ‘Regular’ registry, rather than the ‘Solid Paint‐Bred’ division, providing a threshold modeled phenotype. Genetic studies previously defined sequence variants corresponding to 35 alleles for white spotting in the horse. Here, we calculate the allele frequencies for nine common white‐spotting alleles in the American Paint Horse using a sample of 1054 registered animals. The APHA spotting phenotype is altered by additive interactions among spotting loci, and epistatically by the MC1R and ASIP genes controlling pigment production. The W20 allele within the KIT gene, independent of other known spotting alleles, was strongly associated with the APHA‐defined white‐spotting phenotype (P = 1.86 × 10−18), refuting reports that W20 acts only as a modifier of other underlying white‐spotting patterns. The parentage of an individual horse, either American Paint or American Quarter Horse, did not alter the likelihood of its entering the APHA Regular Registry. An empirical definition of the action of these genetic loci on the APHA‐defined white‐spotting phenotype will allow more accurate application of genome‐assisted selection for improving color production and the marketability of APHA horses.

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Section: Resultsmentioning

confidence: 93%

Impact of white‐spotting alleles, including W20, on phenotype in the American Paint Horse

et al. 2020

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“…Classic tobiano, minimal tobiano, and cryptic tobiano are terms used to describe the diversity of phenotypes displayed by individuals with the Tobiano allele (Figure 2). Classic tobiano horses display large patches of white spotting, with clear borders [1,24,36,41]. Classic markings often spread over the flank, stretch up the neck, and cross the back.…”

Section: Phenotypementioning

confidence: 99%

Spotting the Pattern: A Review on White Coat Color in the Domestic Horse

McFadden,

Vierra,

Martin

et al. 2024

Animals

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Traits such as shape, size, and color often influence the economic and sentimental value of a horse. Around the world, horses are bred and prized for the colors and markings that make their unique coat patterns stand out from the crowd. The underlying genetic mechanisms determining the color of a horse’s coat can vary greatly in their complexity. For example, only two genetic markers are used to determine a horse’s base coat color, whereas over 50 genetic variations have been discovered to cause white patterning in horses. Some of these white-causing mutations are benign and beautiful, while others have a notable impact on horse health. Negative effects range from slightly more innocuous defects, like deafness, to more pernicious defects, such as the lethal developmental defect incurred when a horse inherits two copies of the Lethal White Overo allele. In this review, we explore, in detail, the etiology of white spotting and its overall effect on the domestic horse to Spot the Pattern of these beautiful (and sometimes dangerous) white mutations.

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“…The white spots which characterize piebald/skewbald Hucul horses correspond to the tobiano pattern (completely dominant To allele) (Stachurska and Jansen 2015;Pasternak et al 2018). The authors of this study claim that phenotypic distinction of heterozygotes from homozygotes is not possible, as in both cases the coat pattern may be similar (Sponenberg and Bellone 2017).…”

Section: Genetic Background Of Tobiano Pattern In Hucul Horsesmentioning

confidence: 99%

“…Therefore, it is possible that some of them were of piebald/skewbald coat colour which was expressed in the form of the crypto-tobiano pattern (Gibała 2012). Stachurska and Jansen (2015) presented examples of misclassified Huculs with the crypto-tobiano pattern in their paper.…”

Section: Breeding Aspect Of the Huculs' Coat Colourmentioning

confidence: 99%