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Signatures of historical selection on MHC reveal different selection patterns in the moor frog (Rana arvalis)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Uppsala University.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2018 (English)In: Immunogenetics, ISSN 0093-7711, E-ISSN 1432-1211Article in journal (Refereed) Epub ahead of print
Abstract [en]

MHC genes are key components in disease resistance and an excellent system for studying selection acting on genetic variation in natural populations. Current patterns of variation in MHC genes are likely to be influenced by past and ongoing selection as well as demographic fluctuations in population size such as those imposed by post-glacial recolonization processes. Here, we investigated signatures of historical selection and demography on an MHC class II gene in 12 moor frog populations along a 1700-km latitudinal gradient. Sequences were obtained from 207 individuals and consecutively assigned into two different clusters (northern and southern clusters, respectively) in concordance with a previously described dual post-glacial colonization route. Selection analyses comparing the relative rates of non-synonymous to synonymous substitutions (dN/dS) suggested evidence of different selection patterns in the northern and the southern clusters, with divergent selection prevailing in the south but uniform positive selection predominating in the north. Also, models of codon evolution revealed considerable differences in the strength of selection: The southern cluster appeared to be under strong selection while the northern cluster showed moderate signs of selection. Our results indicate that the MHC alleles in the north diverged from southern MHC alleles as a result of differential selection patterns.

Place, publisher, year, edition, pages
2018.
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Evolutionary Biology
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URN: urn:nbn:se:uu:diva-341392DOI: 10.1007/s00251-017-1051-1OAI: oai:DiVA.org:uu-341392DiVA, id: diva2:1181141
Available from: 2018-02-07 Created: 2018-02-07 Last updated: 2018-02-08Bibliographically approved

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Cortazar-Chinarro, MariaMeyer-Lucht, YvonneLaurila, AnssiHöglund, Jacob
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