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Mitochondrial DNA polymorphism in Jindo dogs

F Umenishi1, B K Han, S Ikemoto

  • 1Department of Legal Medicine and Human Genetics, Jichi Medical School, Tochigi-ken, Japan.

The Journal of Veterinary Medical Science
|April 1, 1993
PubMed
Summary

Mitochondrial DNA (mtDNA) analysis reveals Jindo dogs exhibit significant genetic purity. This study explored mtDNA polymorphism in Jindo dogs, finding limited variation, suggesting a distinct and conserved lineage.

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Area of Science:

  • Genetics
  • Zoology
  • Molecular Biology

Background:

  • Mitochondrial DNA (mtDNA) serves as a crucial marker for studying genetic diversity and population structure in various species.
  • The Jindo dog, a native Korean breed, is of significant interest due to its unique history and potential genetic distinctiveness.

Purpose of the Study:

  • To investigate the mitochondrial DNA (mtDNA) polymorphism within a population of Jindo dogs from Jin Island.
  • To assess the genetic diversity and purity of the Jindo dog breed using molecular markers.

Main Methods:

  • Analysis of mitochondrial DNA (mtDNA) from 21 Jindo dogs using 10 restriction endonucleases.
  • Separation of mtDNA fragments via agarose gel electrophoresis and detection using a Japanese mongrel dog mtDNA probe.
  • Phylogenetic analysis using UPG (Unweighted Pair Group) method.

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Main Results:

  • mtDNA polymorphism was detected in Jindo dogs using four specific restriction endonucleases (Apa I, EcoR V, Hinc II, Sty I).
  • Four distinct restriction endonuclease morphs were identified, with an average nucleotide substitution rate of 0.0086.
  • Phylogenetic analysis clustered the four mtDNA types into a single group, indicating low divergence.

Conclusions:

  • The Jindo dog population studied exhibits considerable genetic purity with limited mtDNA divergence.
  • The findings suggest that Jindo dogs have maintained a conserved genetic lineage, supporting their status as a distinct breed.