title: Polar overdominance at the ovine callipyge locus.
abstract: An inheritable muscular hypertrophy was recently described in sheep and shown to be determined by the callipyge gene mapped to ovine chromosome 18. Here, the callipyge phenotype was found to be characterized by a nonmendelian inheritance pattern, referred to as polar overdominance, where only heterozygous individuals having inherited the callipyge mutation from their sire express the phenotype. The possible role of parental imprinting in the determinism of polar overdominance is envisaged.
authors.affiliation: Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, UT 84322-4700, USA.
authors.forename: N E
authors.initials: NE
authors.lastname: Cockett
authors.forename: S P
authors.initials: SP
authors.lastname: Jackson
authors.forename: T L
authors.initials: TL
authors.lastname: Shay
authors.forename: F
authors.initials: F
authors.lastname: Farnir
authors.forename: S
authors.initials: S
authors.lastname: Berghmans
authors.forename: G D
authors.initials: GD
authors.lastname: Snowder
authors.forename: D M
authors.initials: DM
authors.lastname: Nielsen
authors.forename: M
authors.initials: M
authors.lastname: Georges
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D005799:Genes, Dominant; D018392:Genomic Imprinting; D005838:Genotype; D006579:Heterozygote; D008126:Lod Score; D008297:Male; D008957:Models, Genetic; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D009154:Mutation; D010641:Phenotype; D012756:Sheep / Q000033:anatomy & histology* / Q000235:genetics*