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Effects of Genetic Sex and Genomic Background on Epistasis in Rainbow Trout (Oncorhynchus mykiss)

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Abstract

Epistasis among quantitative trait loci (QTL) for survival (upper thermal tolerance, UTT) and morphological (fork length, FL and condition factor, K) traits was detected in purestrain and interstrain rainbow trout (Oncorhynchus mykiss) families. One sex-linked (OmyFGT19TUF) and three autosomal (Omy325UoG, Ssa14DU and Ssa20.19NUIG; linkage groups B, D and S, respectively) microsatellite loci linked to UTT QTL in this species were used. Within half sib families, significant effects of full sib family on epistasis involving Omy325UoG and OmyFGT19TUF were detected at a rate significantly higher than expected for UTT (p < 0.001*) and FL (p < 0.01*), using results significant at comparisonwise significance thresholds derived from permutational analysis. Measured across half sib families, the phenotype of female genotypic classes was more divergent from the family trait mean than that of males where epistasis involved the sex-linked locus OmyFGT19TUF (p = 0.0176*), and also for means over all families (p = 0.0355*). Female genotypic classes were also more divergent (p = 0.0011**) from the full sib trait mean where three-way interaction between OmyFGT19TUF, one of the autosomal loci and full sib family was significant, and marginally more divergent for trait means of genotypic classes across all full sib families (p = 0.0856†). There was no evidence that these effects were more pronounced in hybrid F1 families than purestrains.

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Author notes

  1. G.M.L. Perry

    Present address: Départment de Biologie, Groupe Interuniversitaire de Recherches Océanographiques du Québec (GIROQ), Université Laval, Ste-Foy, Qué., Canada, G1K 7P4

Authors and Affiliations

  1. Department of Zoology, University of Guelph, Guelph, Ont., Canada, N1G 2W1

    G.M.L. Perry, M.M. Ferguson & R.G. Danzmann

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Perry, G., Ferguson, M. & Danzmann, R. Effects of Genetic Sex and Genomic Background on Epistasis in Rainbow Trout (Oncorhynchus mykiss). Genetica 119, 35–50 (2003). https://doi.org/10.1023/A:1024493013926

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