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Physiol. Genomics 7: 69-78, 2001; doi:10.1152/physiolgenomics.00051.2001
1094-8341/01 $5.00
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Physiological Genomics 7:69-78 (2001)
1094-8341/01 $5.00 © 2001 American Physiological Society

Invited Review

Analysis of the sheep genome

N. E. COCKETT, T. L. SHAY and M. SMIT

Department of Animal, Dairy and Veterinary Science, Utah State University, Logan, Utah 84322-4700

The identification of genes controlling several traits of interest in sheep has been accomplished by positional candidate cloning. In these studies, the trait is first mapped to a specific chromosomal region by linkage analysis, which requires families that are segregating for the trait and for polymorphic markers. Microsatellite markers are usually used for these analyses because of their extensive genetic variability. Once the location of a trait is determined by linkage to the markers, possible candidate genes controlling the trait can be inferred because of their proximity to linked markers. It is not necessary to map all possible genes in sheep for this strategy to be effective. Rather, a subset of genes that are mapped in humans and mice have also been mapped in sheep; these genes serve as "anchors" across the comparative maps of the different species. Further study of these positional candidates has revealed naturally occurring mutations that produce phenotypes that are unique to sheep. Thus the genetic analysis of sheep traits advances knowledge not only in this species but provides critical information for understanding biological pathways in mammalian species.

ovine; comparative gene mapping; positional candidate cloning




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