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Animal genetics2006; 37(5); 494-497; doi: 10.1111/j.1365-2052.2006.01495.x

Evidence for biogeographic patterning of mitochondrial DNA sequences in Eastern horse populations.

Abstract: Equine mitochondrial DNA (mtDNA) phylogeny reconstruction reveals a complex pattern of variation unlike that seen in other large domesticates. It is likely that this pattern reflects a process of multiple and repeated, although not necessarily independent, domestication events. Until now, no clear geographic affiliation of clades has been apparent. In this study, amova analyses have revealed a significant non-random distribution of the diversity among equine populations when seven newly sequenced Eurasian populations were examined in the context of previously published sequences. The association of Eastern mtDNA types in haplogroup F was highly significant using Fisher's exact test of independence (P = 0.00000). For the first time, clear biogeographic partitioning has been detected in equine mtDNA sequence.
Publication Date: 2006-09-19 PubMed ID: 16978180DOI: 10.1111/j.1365-2052.2006.01495.xGoogle Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

Summary

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This research study found geographical patterns in mitochondrial DNA sequences in Eastern horse populations suggesting multiple and repeated domestication events, marking the first time distinct biogeographical partitioning has been identified in equine DNA.

Introduction to the Research Study

  • This research focuses on analyzing the mitochondrial DNA (mtDNA) of horse populations from different geographic areas, with a specific focus on Eastern horse populations.
  • The researchers are trying to understand the pattern of variation in these DNA sequences and how they relate to domestication events.
  • Until now, no clear geographic affiliation of these DNA sequence variations (or clades) was evident. This study aims to dig deeper and find potential links.

Research Methods

  • Using seven newly sequenced Eurasian horse populations, in addition to previously published sequences, the researchers conducted ‘Analysis of Molecular Variance’ (amova) analyses. This method allows researchers to compare the genetic diversity within and among populations and groupings of individuals.

Findings

  • Through their analyses, they discovered a non-random distribution of diversity among equine populations, suggesting that there was a historic and geographical influence on the DNA of these horse populations.
  • They found a significant association of Eastern mtDNA types in haplogroup F, a particular genetic group of horses. This was validated using Fisher’s exact test of independence, a statistical significance test used to determine if there are nonrandom associations between two categorical variables.
  • This is the first time clear biogeographic partitioning has been detected in equine mtDNA sequence, indicating that DNA sequences of horses may be influenced by their geographical location and the historical events that took place there, including patterns of domestication.

Implications and Future Researchers

  • This study opens up a new understanding of the history and journey of horse domestication.
  • Further research could be conducted to understand these multipart and repeated domestication processes, providing a clearer picture of how the genetics of horses have been shaped by the cultural and geographical aspects of their past.

Cite This Article

APA
McGahern A, Bower MA, Edwards CJ, Brophy PO, Sulimova G, Zakharov I, Vizuete-Forster M, Levine M, Li S, MacHugh DE, Hill EW. (2006). Evidence for biogeographic patterning of mitochondrial DNA sequences in Eastern horse populations. Anim Genet, 37(5), 494-497. https://doi.org/10.1111/j.1365-2052.2006.01495.x

Publication

ISSN: 0268-9146
NlmUniqueID: 8605704
Country: England
Language: English
Volume: 37
Issue: 5
Pages: 494-497

Researcher Affiliations

McGahern, A
  • Animal Genomics Laboratory, School of Agriculture, Food Science and Veterinary Medicine, College of Life Sciences, University College Dublin, Belfield, Dublin 4, Ireland.
Bower, M A M
    Edwards, C J
      Brophy, P O
        Sulimova, G
          Zakharov, I
            Vizuete-Forster, M
              Levine, M
                Li, S
                  MacHugh, D E
                    Hill, E W

                      MeSH Terms

                      • Animals
                      • Asia
                      • DNA, Mitochondrial / chemistry
                      • Europe
                      • Genetic Variation
                      • Geography
                      • Haplotypes
                      • Horses / genetics
                      • Phylogeny
                      • Sequence Analysis, DNA

                      Citations

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