Genetic Diversity and Structure of Iranian Horses' Population Based on Mitochondrial Markers.
Authors: Hedayat Evrigh Nemat, Omri Mostafa, Boustan Azadeh, Seyedsharifi Reza, Vahedi Vahid
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Genetic Diversity of Iranian Native Horse Breeds Iranian horse breeding has maintained remarkable maternal genetic diversity across its native populations, as evidenced by mitochondrial DNA analysis of 96 animals spanning six breeds. Researchers sequenced the hypervariable D-loop region (430 base pairs) from blood samples and identified 52 distinct maternal haplotypes distributed across 11 major haplogroups, with overall haplotype diversity of 0.980—indicating extensive genetic variation within the population. Nucleotide diversity varied minimally between breeds (0.0172–0.0242), though significant population differentiation emerged between certain lines: Kord horses showed the highest nucleotide differences (average k = 8.5), whilst Darehshori/Qashqai horses were the most genetically uniform (k = 6.0), with the greatest breed separation observed between Kord and Darehshori populations (Fst = 0.193). For practitioners involved in breeding programmes, performance selection, and genetic management, these findings confirm that Iranian native breeds represent distinct maternal lineages worthy of conservation, whilst the high genetic diversity suggests considerable scope for maintaining heterozygosity and adaptive potential within breeding decisions. The absence of population bottlenecks (non-significant Tajima D = 0.441) indicates these breeds have sustained multiple founder lines, supporting continued selection emphasis on performance traits without immediate concern for inbreeding depression.
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Practical Takeaways
- •Iranian native horse breeds maintain substantial maternal genetic diversity, suggesting multiple distinct breeding lines and potential value for selective breeding programmes
- •High genetic differentiation between some breeds (Kord vs. Darehshori; Fst=0.193) may inform decisions about crossbreeding and breed preservation strategies
- •Genetic data supports the preservation of these native breeds as reservoirs of genetic material and adaptive traits
Key Findings
- •Analysis of mitochondrial D-loop region identified 52 haplotypes across 11 haplogroups in Iranian native horses
- •High genetic diversity (0.980) and haplotype diversity (0.0233) observed across six native horse breeds
- •Nucleotide diversity ranged from 0.0172–0.0242 across populations, with Kord horses showing the highest average nucleotide differences (k=8.5)
- •Tajima D value of 0.441 was not significant, indicating no evidence of population expansion or contraction