Journal of Molecular Evolution

, Volume 24, Issue 3, pp 218–227 | Cite as

Transfer of mitochondrial DNA from the northern red-backed vole (Clethrionomys rutilus) to the bank vole (C. glareolus)

  • Håkan Tegelström


Using a silver staining method to detect DNA fragments produced by restriction enzymes, it was possible to compare mitochondrial DNAs (mtDNAs) from 85 individuals of the bank vole (Clethrionomys glareolus) trapped at 25 localities in Fennoscandia. There are two distinctly different mtDNA lineages, one occurring in southern and central Fennoscandia and the other in the northern parts. A fragment comparison method shows about 12.7% nucleotide sequence divergence between these two lineages. This major difference between animals of the same species could theoretically be explained by intraspecific lineage survivorship independent of species hybridization, or by introduction of an atypical mtDNA via hybridization with a closely related species. Analysis of mtDNAs from the two otherClethrionomys species present in Fennoscandia (C. rutilus andC. rufocanus) shows that the mtDNA of northernC. glareolus is very similar to that ofC. rutilus and that the mtDNA lineages of these two species cluster together in a phenogram, with small genetic distances among them. By contrast, electrophoresis of proteins encoded by 17 nuclear loci reveals fixed allelic differences between these two species at 8 loci. Hence the presence of two distinctly different mtDNA lineages withinC. glareolus may be a consequence of a limited episode of hybridization betweenC. glareolus andC. rutilus, probably during the postglacial recolonization of Fennoscandia 8000–13,000 years ago.

Key words

Restriction-fragment analysis Silver staining Protein electrophoresis Population genetics Interspecific transfer of DNA Historical biogeography 


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Copyright information

© Springer-Verlag New York Inc. 1987

Authors and Affiliations

  • Håkan Tegelström
    • 1
  1. 1.Department of GeneticsUniversity of UppsalaUppsalaSweden

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