Journal of Molecular Evolution

, Volume 41, Issue 2, pp 180–188

Mitochondrial DNA sequences of various species of the genus Equus with special reference to the phylogenetic relationship between Przewalskii's wild horse and domestic horse

  • Nobushige Ishida
  • Tsendsuren Oyunsuren
  • Suguru Mashima
  • Harutaka Mukoyama
  • Naruya Saitou
Articles

Abstract

The noncoding region between tRNAPro and the large conserved sequence block is the most variable region in the mammalian mitochondrial DNA D-loop region. This variable region (ca. 270 bp) of four species of Equus, including Mongolian and Japanese native domestic horses as well as Przewalskii's (or Mongolian) wild horse, were sequenced. These data were compared with our recently published Thoroughbred horse mitochondrial DNA sequences. The evolutionary rate of this region among the four species of Equus was estimated to be 2–4 × 10−8 per site per year. Phylogenetic trees of Equus species demonstrate that Przewalskii's wild horse is within the genetic variation among the domestic horse. This suggests that the chromosome number change (probably increase) of the Przewalskii's wild horse occurred rather recently.

Key words

Mitochondrial DNA Noncoding D-loop region Phylogenetic tree Przewalskii's wild horse Equus caballus Evolutionary rate 

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Copyright information

© Springer-Verlag New York Inc 1995

Authors and Affiliations

  • Nobushige Ishida
    • 1
  • Tsendsuren Oyunsuren
    • 2
  • Suguru Mashima
    • 3
  • Harutaka Mukoyama
    • 1
  • Naruya Saitou
    • 4
  1. 1.Laboratory of Molecular and Cellular Biology, Equine Research InstituteJapan Racing AssociationTokyoJapan
  2. 2.Department of Molecular BiologyInstitute of BiotechnologyUlaanbaatarMongolia
  3. 3.Section of Molecular GeneticsLaboratory of Racing ChemistryTokyoJapan
  4. 4.Laboratory of Evolutionary GeneticsNational Institute of GeneticsMishimaJapan

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