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A Genome Wide Survey of SNP Variation Reveals the Genetic Structure of Sheep Breeds

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Title A Genome Wide Survey of SNP Variation Reveals the Genetic Structure of Sheep Breeds
 
Creator Kijas, J.W.
Townley, D.
Dalrymple, B.P.
Heaton, M.P.
Maddox, J.F.
 
Description The genetic structure of sheep reflects their domestication and subsequent formation into discrete breeds. Understanding genetic structure is essential for achieving genetic improvement through genome-wide association studies, genomic selection and the dissection of quantitative traits. After identifying the first genome-wide set of SNP for sheep, we report on levels of genetic variability both within and between a diverse sample of ovine populations. Then, using cluster analysis and the partitioning of genetic variation, we demonstrate sheep are characterised by weak phylogeographic structure, overlapping genetic similarity and generally low differentiation which is consistent with their short evolutionary history. The degree of population substructure was, however, sufficient to cluster individuals based on geographic origin and known breed history. Specifically, African and Asian populations clustered separately from breeds of European origin sampled from Australia, New Zealand, Europe and North America. Furthermore, we demonstrate the presence of stratification within some, but not all, ovine breeds. The results emphasize that careful documentation of genetic structure will be an essential prerequisite when mapping the genetic basis of complex traits. Furthermore, the identification of a subset of SNP able to assign individuals into broad groupings demonstrates even a small panel of markers may be suitable for applications such as traceability.
 
Date 2010-04-21T13:12:12Z
2010-04-21T13:12:12Z
2009-03
 
Type Journal Article
 
Identifier Kijas JW, Townley D, Dalrymple BP, Heaton MP, Maddox JF, et al. (2009) A Genome Wide Survey of SNP Variation Reveals the Genetic Structure of Sheep Breeds. PLoS ONE 4(3): e4668
1932-6203
https://hdl.handle.net/10568/1317
 
Language en
 
Source PLOS ONE