Selection and Phylogenetics of Salmonid MHC Class I: Wild Brown Trout (Salmo trutta) Differ from a Non-Native Introduced Strain

We tested how variation at a gene of adaptive importance, MHC class I (UBA), in a wild, endemic Salmo trutta population compared to that in both a previously studied non-native S. trutta population and a co-habiting Salmo salar population (a sister species). High allelic diversity is observed and al...

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Bibliographic Details
Published in:PLoS ONE
Main Authors: O'Farrell, Brian, Benzie, John A. H., McGinnity, Phil, de Eyto, Elvira, Dillane, Eileen, Coughlan, James, Cross, Tom F.
Format: Text
Language:English
Published: Public Library of Science 2013
Subjects:
Research Article
Ula
Salmo salar
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646885
http://www.ncbi.nlm.nih.gov/pubmed/23667568
https://doi.org/10.1371/journal.pone.0063035
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Summary:We tested how variation at a gene of adaptive importance, MHC class I (UBA), in a wild, endemic Salmo trutta population compared to that in both a previously studied non-native S. trutta population and a co-habiting Salmo salar population (a sister species). High allelic diversity is observed and allelic divergence is much higher than that noted previously for co-habiting S. salar. Recombination was found to be important to population-level divergence. The α1 and α2 domains of UBA demonstrate ancient lineages but novel lineages are also identified at both domains in this work. We also find examples of recombination between UBA and the non-classical locus, ULA. Evidence for strong diversifying selection was found at a discrete suite of S. trutta UBA amino acid sites. The pattern was found to contrast with that found in re-analysed UBA data from an artificially stocked S. trutta population.

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