Mitochondrial D-loop sequence variation among Italian horse breeds

Area of Science:

• Animal Genetics
• Molecular Biology
• Population Genetics

Background:

• Mitochondrial DNA (mtDNA) analysis is crucial for understanding equine population genetics and evolutionary history.
• Italian horse breeds possess unique genetic profiles that warrant detailed investigation.

Purpose of the Study:

• To analyze the genetic variability of mitochondrial D-loop DNA sequences in seven Italian horse breeds.
• To compare Italian horse breeds with foreign breeds and wild horses to infer evolutionary relationships and origins.

Main Methods:

• Sequencing of the mitochondrial D-loop DNA in five unrelated horses from each of the seven Italian breeds.
• Alignment and comparison of obtained sequences with reference and GenBank sequences.
• Phylogenetic analysis using Kimura two-parameter distances and Neighbour-joining cluster analysis.

Main Results:

• Twenty-two distinct haplotypes were identified among the Italian horse breeds.
• Cluster analysis showed that most Italian breeds, except Giara, formed distinct clusters.
• No clear phylogenetic relationships were established between Italian populations and Spanish, Portuguese, North African, or wild horse breeds.

Conclusions:

• The genetic diversity observed suggests a mixed origin for Italian horse breeds.
• The findings indicate the presence of numerous ancient maternal lineages with significant diversity in their mtDNA sequences.
• Further research is needed to fully elucidate the complex genetic history of Italian equine populations.