Novel insights into Sabino1 and splashed white coat color patterns in horses.

This research paper investigates the genetic basis of two distinct coat color patterns in horses: sabino1, related to the KIT gene, and splashed white, related to the PAX3 gene. Conducted across eight different horse breeds, the researchers found that, besides Quarter horses, the PAX3 allele exists also in Noriker and Lipizzan horses, while the SB1 allele was found in Haflinger, Noriker and Lipizzan breeds. Furthermore, the existence of white spotting patterns and their relation to these identified genes were examined and discussed.

Genetic Analysis of Coat Color Patterns in Horses

• The research included genome-wide analyses using the novel Axiom genotyping array, which allowed the detection of specific genes associated to the coat color patterns in the horse breeds studied.
• The sabino1 (SBI) and splashed white patterns were the main focus of the study, associated with the KIT and PAX3 genes, respectively.
• The study focused on eight different horse breeds, including the Achal Theke, Purebred Arabian, Partbred Arabian, Anglo-Arabian, Shagya Arabian, Haflinger, Lipizzan and Noriker.

Findings of the Study

• The PAX3 allele, associated to the splashed white pattern, was found in Quarter horses as well as in Noriker and Lipizzan horses.
• The SB1 allele, associated to the sabino1 pattern, was detected in Haflinger, Noriker and Lipizzan breeds.
• The authors also noted that none of the SB1/sb1-carrier horses met the criteria defining the Sabino1 pattern according to current protocols. This suggests that further research is required to adjust existing criteria or explore other potential genetic factors involved.
• Similarly, from the 10 PAX3-carrier horses, only two showed a significant splashed white phenotype, indicating a complex association between this gene and the coat pattern.

Conclusion and Further Implications

• The study highlights the influence of gene interactions and population differences on complex traits such as the Sabino1 and splashed white patterns.
• The presence of the PAX3 allele in horse breeds other than Quarter horses suggests a wider distribution of this gene among horse populations.
• The mismatch between the observed phenotypes and the genetic patterns indicate more research is needed to understand the entire spectrum of genetic factors influencing these coat patterns.