Sequence analysis of the mitochondrial D-loop region throws a new light on the origin of Hungarian Nonius, Danubian Horse and Serbian Nonius.

The research article investigates the genetic structure and origins of three closely related horse breeds – the Danubian Horse, the Hungarian Nonius, and the Serbian Nonius – via sequence analysis of the mitochondrial D-loop region.

Methodology and Results

• In the study, a 640-bp-long fragment of the mtDNA D-loop region was amplified and sequenced. The mtDNA D-loop region is a highly mutable area of the mitochondrial genome, often used in population genetics studies due to the high rate of mutation and maternal inheritance.
• This detailed genetic analysis revealed that even though these horse breeds are closely related, they each have distinct genetic profiles while also sharing some common characteristics.
• The researchers were able to identify nine of the 17 haplogroups present in modern horses. Haplogroups are groups of similar haplotypes that share a common ancestor, and they can be used to trace the genetic lineage of an organism.

Specific Breeds’ Genetic Traits

• The Danubian Horse’s genetic structure was primarily characterized by a high prevalence of the Anatolian specific haplogroup G (45%), followed by the Western Eurasian specific haplogroups L and M (both about 21%)
• The Hungarian Nonius breed reported the highest frequency of Western Eurasian haplogroup M (44%), followed by the Middle Eastern O’P (26%) and the Central Asian specific E (13%) and G (13%)
• The Serbian Nonius exhibited a distinct genetic profile with a high prevalence of the rare European haplogroup D (67%), followed by the Central Asian specific haplogroup G (17%)

Implications and Conclusions

• The significant presence of certain haplogroups, particularly in the M, L, G, and O’P lineages, provides an indication of the ancestral mares that were probably used during the formation of these breeds.
• A high percentage of haplogroups, especially between the Danubian and the Hungarian Nonius, points to the potential common origin of these two breeds.
• On the contrary, the Serbian Nonius showed a unique genetic profile which suggests a different and independent origin.

Through this research, the study provides valuable insights into the genetic structure and origins of these particular horse breeds, contributing significantly to the understanding of equine biodiversity and breed formation history.