A1 Refereed original research article in a scientific journal
Comparison of Migratory and Resident Populations of Brown Trout Reveals Candidate Genes for Migration Tendency
Authors: Lemopoulos A, Uusi-Heikkilä S, Huusko A, Vasemägi A, Vainikka A
Publisher: OXFORD UNIV PRESS
Publication year: 2018
Journal: Genome Biology and Evolution
Journal name in source: GENOME BIOLOGY AND EVOLUTION
Journal acronym: GENOME BIOL EVOL
Volume: 10
Issue: 6
First page : 1493
Last page: 1503
Number of pages: 11
ISSN: 1759-6653
eISSN: 1759-6653
DOI: https://doi.org/10.1093/gbe/evy102
Web address : https://academic.oup.com/gbe/article/10/6/1493/5020727
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/35680322
Candidate genes associated with migration have been identified in multiple taxa: including salmonids, many of whom perform migrations requiring a series of physiological changes associated with the freshwater-saltwater transition. We screened over 5,500 SNPs for signatures of selection related to migratory behavior of brown trout Salmo trutta by focusing on ten differentially migrating freshwater populations from two watersheds (the Koutajoki and the Oulujoki). We found eight outlier SNPs potentially associated with migratory versus resident life history using multiple (>= 3) outlier detection approaches. Comparison of three migratory versus resident population pairs in the Koutajoki watershed revealed seven outlier SNPs, of which three mapped close to genes ZNF665-like, GRM4-like, and PCDH8-like that have been previously associated with migration and smoltification in salmonids. Two outlier SNPs mapped to genes involved in mucus secretion (ST3GAL1-like) and osmoregulation (C14orf37-like). The last two strongly supported outlier SNPs mapped to thermally induced genes (FNTA1-like, FAM134C-like). Within the Oulujoki, the only consistent outlier SNP mapped close to a gene (EZH2) that is associated with compensatory growth in fasted trout. Our results suggest that a relatively small yet common set of genes responsible for physiological functions associated with resident and migratory life histories is evolutionarily conserved.
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