Beyond MHC: signals of elevated selection pressure on Atlantic salmon (Salmo salar) immune-relevant loci



: Tonteri A, Vasemagi A, Lumme J, Primmer CR

Publisher: WILEY-BLACKWELL PUBLISHING, INC

: 2010

: Molecular Ecology

: MOLECULAR ECOLOGY

: MOL ECOL

: 7

: 19

: 7

: 1273

: 1282

: 10

: 0962-1083

DOI: https://doi.org/10.1111/j.1365-294X.2010.04573.x


Using Atlantic salmon (Salmo salar) as a model system, we investigated whether 18 microsatellites tightly linked to immune-relevant genes have experienced different selection pressures than 76 loci with no obvious association with immune function. Immune-relevant loci were identified as outliers by two outlier tests significantly more often than nonimmune linked loci (22% vs. 1.6%). In addition, the allele frequencies of immune relevant markers were more often correlated with latitude and temperature. Combined, these results support the hypothesis that immune-relevant loci more frequently exhibit footprints of selection than other loci. They also indicate that the correlation between immune-relevant loci and latitude may be due to temperature-induced differences in pathogen-driven selection or some other environmental factor correlated with latitude.



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