Introgression of mitochondrial DNA among Myodes voles: consequences for energetics?

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dc.contributor.author Boratyński, Zbyszek
dc.contributor.author Alves, Paulo C
dc.contributor.author Berto, Stefano
dc.contributor.author Koskela, Esa
dc.contributor.author Mappes, Tapio
dc.contributor.author Melo-Ferreira, José
dc.date.accessioned 2012-11-13T12:59:56Z
dc.date.available 2012-11-13T12:59:56Z
dc.date.issued 2011-12-09
dc.identifier.citation Boratynski, Z., Alves, P., Berto, S., Koskela, E., Mappes, T., & Melo-Ferreira, J. (2011). Introgression of mitochondrial DNA among Myodes voles: consequences for energetics?. BMC Evolutionary Biology, 11:355. Retrieved from http://www.biomedcentral.com/1471-2148/11/355
dc.identifier.issn 1471-2148
dc.identifier.uri http://dx.doi.org/10.1186/1471-2148-11-355
dc.identifier.uri http://hdl.handle.net/123456789/40311
dc.description.abstract Abstract Background Introgression of mitochondrial DNA (mtDNA) is among the most frequently described cases of reticulate evolution. The tendency of mtDNA to cross interspecific barriers is somewhat counter-intuitive considering the key function of enzymes that it encodes in the oxidative-phosphorylation process, which could give rise to hybrid dysfunction. How mtDNA reticulation affects the evolution of metabolic functions is, however, uncertain. Here we investigated how morpho-physiological traits vary in natural populations of a common rodent (the bank vole, Myodes glareolus) and whether this variation could be associated with mtDNA introgression. First, we confirmed that M. glareolus harbour mtDNA introgressed from M. rutilus by analyzing mtDNA (cytochrome b, 954 bp) and nuclear DNA (four markers; 2333 bp in total) sequence variation and reconstructing loci phylogenies among six natural populations in Finland. We then studied geographic variation in body size and basal metabolic rate (BMR) among the populations of M. glareolus and tested its relationship with mtDNA type. Results Myodes glareolus and its arctic neighbour, M. rutilus, are reciprocally monophyletic at the analyzed nuclear DNA loci. In contrast, the two northernmost populations of M. glareolus have a fixed mitotype that is shared with M. rutilus, likely due to introgressive hybridization. The analyses of phenotypic traits revealed that the body mass and whole-body, but not mass corrected, BMR are significantly reduced in M. glareolus females from northern Finland that also have the introgressed mitotype. Restricting the analysis to the single population where the mitotypes coexist, the association of mtDNA type with whole-body BMR remained but those with mass corrected BMR and body mass did not. Mitochondrial sequence variation in the introgressed haplotypes is compatible with demographic growth of the populations, but may also be a result of positive selection. Conclusion Our results show that the phenotypic traits vary markedly along the north-south axis of populations of M. glareolus. This variation may be related to adaptation to local environments and coincides with the gradient of genome reticulation between M. glareolus and M. rutilus, which was assessed by mtDNA introgression. Introgression of mtDNA may have affected morpho-physiological traits but do not show strong effects on either body mass or basal metabolic rate alone. We discuss the causes and biological meaning of our results and the means to clarify these questions in future research.
dc.language.iso eng
dc.relation.ispartofseries BMC Evolutionary Biology
dc.rights © 2011 Boratyński et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights http://creativecommons.org/licenses/by/2.0
dc.subject.other introgressio fi
dc.subject.other luonnonvalinta fi
dc.subject.other metsämyyrä fi
dc.subject.other nisäkkäät fi
dc.subject.other mtDNA
dc.subject.other introgression en
dc.subject.other bank vole en
dc.subject.other myodes en
dc.subject.other gene exchange en
dc.subject.other natural selection en
dc.title Introgression of mitochondrial DNA among Myodes voles: consequences for energetics?
dc.type Article en
dc.subject.kota 118
dc.contributor.laitos Bio- ja ympäristötieteiden laitos fi
dc.contributor.laitos The Department of Biological and Environmental Science en
dc.type.uri http://purl.org/eprint/type/JournalArticle
dc.identifier.doi doi:10.1186/1471-2148-11-355
dc.date.updated 2012-11-12T19:01:05Z
dc.description.version Published version
dc.contributor.publisher BioMed Central (BMC)
eprint.status http://purl.org/eprint/type/status/PeerReviewed
dc.rights.holder Zbyszek Boratyński et al.; licensee BioMed Central Ltd.

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