Genetic architecture of body weight,condition factor and age of sexual maturation in Icelandic Arctic charr (<Emphasis Type="Italic">Salvelinus alpinus</Emphasis>) |
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Authors: | Eva Küttner Hooman K Moghadam Skúli Skúlason Roy G Danzmann Moira M Ferguson |
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Institution: | 1.Department of Integrative Biology,University of Guelph,Guelph,Canada;2.Department of Clinical Sciences, College of Veterinary Medicine,Cornell University,Ithaca,USA;3.Hólar University College,Sauearkrókur,Iceland |
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Abstract: | The high commercial value from the aquaculture of salmonid fishes has prompted many studies into the genetic architecture
of complex traits and the need to identify genomic regions that have repeatable associations with trait variation both within
and among species. We searched for quantitative trait loci (QTL) for body weight (BW), condition factor (CF) and age of sexual
maturation (MAT) in families of Arctic charr (Salvelinus alpinus) from an Icelandic breeding program. QTL with genome-wide significance were detected for each trait on multiple Arctic charr
(AC) linkage groups (BW: AC-4, AC-20; CF: AC-7, AC-20, AC-23, AC-36; MAT: AC-13/34, AC-39). In addition to the genome-wide
significant QTL for both BW and CF on AC-20, linkage groups AC-4, AC-7, AC-8, and AC-16 contain QTL for both BW and CF with
chromosome-wide significance. These regions had effects (albeit weaker) on MAT with the exception of the region on AC-8. Comparisons
with a North American cultured strain of Arctic charr, as well as North American populations of Atlantic salmon (Salmo salar), and rainbow trout (Oncorhynchus mykiss), reveal some conservation in QTL location and structure, particularly with respect to the joint associations of QTL influencing
BW and CF. The detection of some differences in genetic architecture between the two aquaculture strains of Arctic charr may
be reflective of the differential evolutionary histories experienced by these fishes, and illustrates the importance of including
different strains to investigate genetic variation in a species where the intent is to use that variation in selective breeding
programs. |
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