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Genetics, Vol. 167, 1863-1872, August 2004, Copyright © 2004
doi:10.1534/genetics.104.026401
Mapping of Multiple Quantitative Trait Loci Affecting Bovine Spongiform Encephalopathy
Chi Zhang, Dirk-Jan de Koning, Jules Hernández-Sánchez, Chris S. Haley, John L. Williams and Pamela Wiener1
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, United Kingdom
1 Corresponding author: Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, United Kingdom.
E-mail: pam.wiener{at}bbsrc.ac.uk
A whole-genome scan was conducted to map quantitative trait loci (QTL) for BSE resistance or susceptibility. Cows from four half-sib families were included and 173 microsatellite markers were used to construct a 2835-cM (Kosambi) linkage map covering 29 autosomes and the pseudoautosomal region of the sex chromosome. Interval mapping by linear regression was applied and extended to a multiple-QTL analysis approach that used identified QTL on other chromosomes as cofactors to increase mapping power. In the multiple-QTL analysis, two genome-wide significant QTL (BTA17 and X/Yps) and four genome-wide suggestive QTL (BTA1, 6, 13, and 19) were revealed. The QTL identified here using linkage analysis do not overlap with regions previously identified using TDT analysis. One factor that may explain the disparity between the results is that a more extensive data set was used in the present study. Furthermore, methodological differences between TDT and linkage analyses may affect the power of these approaches.
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