The Journal of Heredity 1999:90(6)
© 1999 The American Genetic Association 90:629-634
A QTL for the degree of spotting in cattle shows synteny with the KIT locus on chromosome 6
1Institut für Tierzucht und Tierhaltung der Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany 2Forschungsinstit für die Biologie landwirtschaftlicher Nutziere, Forschungsbereich Molekularbiologie, Dummerstorf, Germany 3Institut für Tierzucht und Haustiergenetik der Justus-Liebig-Universität, Gleßen, Germany 4Institut für Tierzucht der Ludwig-Maximillians-Universität, München, Germany 5Vereinigte Informationssysteme Tierhaltung w.V., Verden/Aller, Germany 6Bayerische Landesantalt für Tierzucht, Grub, Germany *Corresponding author E-mail: nreinsch@tierzucht.uni-kiel.de
The proportion of unpigmented coat on the trunk was determined from photographs of 38 German Simmental and 627 German Holstein bulls distributed over three generations. All 665 animals were members of 18 Holstein and 3 Simmental half-sib families. A Bayesian estimation of heritability yielded a posterior mean of 0.88 and a standard error of 0.08. A quantitative trait loci (QTL) scan over all chromosomes covered by 229 microsatellite marker loci (2926 cM) was performed by fitting a multiple marker regression model to 625 observations from the youngest by fitting a multiple marker regression model to 625 observations from the youngest generation in 18 families. On chromosome 6 a QTL for the proportion of white coat with large effects (experiment-wise error probability < .0001) was found and a less important one on chromosome 3 (chromosome-wise error probability < .009). Chromosome 6 is known to harbor the KIT locus (receptor tyrosinase kinase), which is associated with various depigmentation phenotypes in mice, humans, and pigs. Similarity of phenotypic KIT effects in other species and synteny with the reported QTL suggest that KIT is a serious candidate gene for the degree of spotting in cattle. The results are also discussed with respect to resistance to solar radiation, heat stress, and photosensitization.
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