Distribution of Y chromosomal haplotypes in Japanese native horse populations.
Abstract: The distribution of Y chromosomal haplotypes in Japanese native horse populations was investigated to obtain genetic information on these populations. Here, 159 male/gelded horses from eight local populations were investigated, and three Y haplotypes (JHT-1, JHT-2, and JHT-3) were identified by analyzing five Y-linked loci. Five populations had only JHT-1, whereas two populations had only JHT-2. One population had JHT-1 and JHT-3. Based on the geographical distribution of these haplotypes and previously reported haplotypes for other Asian horses, JHT-1 is considered to be a major haplotype in ancestral native horses. The fixation of each haplotype suggests the influence of independent breeding and genetic drift in each population. These findings complement the results from previous genetic studies of Japanese native horses.
Publication Date: 2018-07-06 PubMed ID: 29991921PubMed Central: PMC6033617DOI: 10.1294/jes.29.39Google Scholar: Lookup
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Summary
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The research paper presents a study on the distribution of Y chromosomal haplotypes in native horse populations of Japan, revealing three distinct haplotypes and their respective distributions, and suggesting influences of unique breeding and genetic drift in each population.
Study of Y Chromosomal Haplotypes
The researchers focused on investigating the Y chromosomal haplotypes in Japan’s native horse populations.
- They undertook a sample size of 159 male or gelded horses from eight different local populations.
- Following the analysis of the samples across five Y-linked loci, three distinct Y haplotypes, termed JHT-1, JHT-2 and JHT-3, were identified.
Results of Haplotype Distribution
The study provided detailed data on the distribution of the identified haplotypes among the populations:
- Out of the eight studied populations, five were found having only the JHT-1 haplotype.
- Two populations showcased only the JHT-2 haplotype.
- The remaining population had both JHT-1 and JHT-3 haplotypes.
Haplotype Inference and Historical Context
The inferences from the results of the study point towards the historical context of these haplotypes:
- Considering the geographical distribution of these haplotypes and the information regarding haplotypes of other Asian horses from previous studies, researchers assume that JHT-1 could be the major haplotype in ancestral native horses.
- This potentially indicates a lineage between the current horse population and their ancestors.
Impact of Breeding and Genetic Drift
The study also highlighted the possible impact of selective breeding and genetic drift on these populations:
- The exclusive fixation of certain haplotypes in specific populations points towards the influence of independent breeding selection in those populations.
- These findings also imply a possible role of genetic drift in the reinforcement of these specific haplotypes, given their constrained variety across the populations.
Contribution to Existing Genetic Studies
By investigating the Y chromosomal haplotypes, their distribution, and the possible influences of selective breeding and genetic drift, this study adds valuable information to the existing body of genetic studies on Japanese native horses:
- Future research can build upon these findings to clarify genetic trends and relationships, potentially aiding more targeted breeding programs.
- This study may also be beneficial for the conservation efforts of these native horse populations.
Cite This Article
APA
Kakoi H, Kikuchi M, Tozaki T, Hirota KI, Nagata SI, Hobo S, Takasu M.
(2018).
Distribution of Y chromosomal haplotypes in Japanese native horse populations.
J Equine Sci, 29(2), 39-42.
https://doi.org/10.1294/jes.29.39 Publication
Researcher Affiliations
- Laboratory of Racing Chemistry, Tochigi 320-0851, Japan.
- Laboratory of Racing Chemistry, Tochigi 320-0851, Japan.
- Laboratory of Racing Chemistry, Tochigi 320-0851, Japan.
- Laboratory of Racing Chemistry, Tochigi 320-0851, Japan.
- Laboratory of Racing Chemistry, Tochigi 320-0851, Japan.
- Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan.
- Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan.
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Citations
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