title: Selection and phylogenetics of salmonid MHC class I: wild brown trout (Salmo trutta) differ from a non-native introduced strain.
abstract: 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.
authors.affiliation: Environmental Research Institute, University College Cork, Cork, Ireland. Eb.ofarrell@ucc.ie
authors.forename: Brian
authors.initials: B
authors.lastname: O'Farrell
authors.forename: John A H
authors.initials: JA
authors.lastname: Benzie
authors.forename: Phil
authors.initials: P
authors.lastname: McGinnity
authors.forename: Elvira
authors.initials: E
authors.lastname: de Eyto
authors.forename: Eileen
authors.initials: E
authors.lastname: Dillane
authors.forename: James
authors.initials: J
authors.lastname: Coughlan
authors.forename: Tom F
authors.initials: TF
authors.lastname: Cross
mesh_terms: D000818:Animals; D001483:Base Sequence; D003062:Codon / Q000235:genetics; D003120:Colorado; D005805:Genes, MHC Class I / Q000235:genetics*; D006649:Histocompatibility Antigens / Q000737:chemistry / Q000235:genetics; D058865:Introduced Species; D007494:Ireland; D008969:Molecular Sequence Data; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D011995:Recombination, Genetic / Q000235:genetics; D045483:Rivers; D012641:Selection, Genetic; D013045:Species Specificity; D014337:Trout / Q000235:genetics*
chemical_list: D003062:Codon; D006649:Histocompatibility Antigens