Chromosomal differences between European and North American Atlantic salmon discovered by linkage mapping and supported by fluorescence in situ hybridization analysis

BMC Genomics

Research Article

Sonja Dominik¹  Sigbjørn Lien²  Matthew P Kent²  Silje Brenna-Hansen²  Elizabeth G Boulding³  William S Davidson⁴  Jieying Li⁴ 

[1] CSIRO Food Futures Flagship and Livestock Industries, Locked Bag 1, 2350, Armidale, New South Wales, Australia;Centre of Integrative Genetics and Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5003, 1430, Ås, Norway;Department of Integrative Biology, University of Guelph, N1G 1W8, Guelph, Ontario, Canada;Department of Molecular Biology and Biochemistry, Simon Fraser University, V5A 1S6, Burnaby, British Columbia, Canada;

关键词: Atlantic Salmon;    Acrocentric Chromosome;    Metacentric Chromosome;    Tandem Fusion;    Robertsonian Fusion;   

DOI  :  10.1186/1471-2164-13-432

 received in 2012-02-11, accepted in 2012-08-09,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundGeographical isolation has generated a distinct difference between Atlantic salmon of European and North American Atlantic origin. The European Atlantic salmon generally has 29 pairs of chromosomes and 74 chromosome arms whereas it has been reported that the North American Atlantic salmon has 27 chromosome pairs and an NF of 72. In order to predict the major chromosomal rearrangements causing these differences, we constructed a dense linkage map for Atlantic salmon of North American origin and compared it with the well-developed map for European Atlantic salmon.ResultsThe presented male and female genetic maps for the North American subspecies of Atlantic salmon, contains 3,662 SNPs located on 27 linkage groups. The total lengths of the female and male linkage maps were 2,153 cM and 968 cM respectively, with males characteristically showing recombination only at the telomeres. We compared these maps with recently published SNP maps from European Atlantic salmon, and predicted three chromosomal reorganization events that we then tested using fluorescence in situ hybridization (FISH) analysis. The proposed rearrangements, which define the differences in the karyotypes of the North American Atlantic salmon relative to the European Atlantic salmon, include the translocation of the p arm of ssa01 to ssa23 and polymorphic fusions: ssa26 with ssa28, and ssa08 with ssa29.ConclusionsThis study identified major chromosomal differences between European and North American Atlantic salmon. However, while gross structural differences were significant, the order of genetic markers at the fine-resolution scale was remarkably conserved. This is a good indication that information from the International Cooperation to Sequence the Atlantic salmon Genome, which is sequencing a European Atlantic salmon, can be transferred to Atlantic salmon from North America.

【 授权许可】

Unknown   
© Brenna-Hansen et al.; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.