The gene for dominant white color in the pig is closely linked to ALB and PDGRFRA on chromosome 8.
White is a widespread coat color among domestic pig breeds and is controlled by an autosomal dominant gene I. The segregation of this gene was analyzed in a reference pedigree for gene mapping developed by crossing the European wild pig and a Large White domestic breed. The gene for dominant white color was shown to be closely linked to the genes for albumin (ALB) and platelet-derived growth factor receptor alpha (PDGFRA) on chromosome 8. An unexpected phenotype with patches of colored and white coat was observed among the F1 and F2 animals. The segregation data indicated that the phenotype was controlled by a third allele, denoted patch (Ip), most likely transmitted by one of the Large White founder animals. It is shown that the ALB, PDGFRA, I linkage group shares homologies with parts of mouse chromosome 5, human chromosome 4, and horse linkage group II, all of which contain dominant genes for white or white spotting. Candidate genes for the dominant white and patch mutations in the pig are proposed on the basis on these linkage homologies and the recent molecular definition of the dominant white spotting (W) and patch (Ph) mutations in the mouse.
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala.
M
M
Johansson
H
H
Ellegren
L
L
Marklund
U
U
Gustavsson
E
E
Ringmar-Cederberg
K
K
Andersson
I
I
Edfors-Lilja
L
L
Andersson
D000418:Albumins / Q000235:genetics*; D000818:Animals; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D005799:Genes, Dominant; D008040:Genetic Linkage; D006200:Hair Color / Q000235:genetics*; D017403:In Situ Hybridization; D008297:Male; D010641:Phenotype; D012150:Polymorphism, Restriction Fragment Length; D017479:Receptors, Platelet-Derived Growth Factor / Q000235:genetics*; D013552:Swine
D000418:Albumins; D017479:Receptors, Platelet-Derived Growth Factor