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Allele and haplotype segregation at the polymorphic sites within the promoter (23indel) and intron 1 (12indel) regions of the PRNP gene was analyzed in Polish Holstein-Friesian cattle. More 23del/del homozygotes and fewer 23ins/ins homozygotes than expected were observed in the offspring of ♂ 23ins/del × ♀ 23ins/del parents. In the offspring of ♂ 23ins/del × ♀ 23del/del parents and ♂ 23del/del × ♀ 23ins/del parents, a trend toward more 23del/del animals and fewer 23ins/del animals than expected was noted. At the 12indel polymorphic site, the only trend found was one toward fewer 12ins/ins genotypes and more 12ins/del and 12del/del genotypes than expected in the offspring of ♂ 12ins/del × ♀ 12ins/del parents. An analysis of haplotype segregation revealed more 23del-12del/23del-12del diplotypes and fewer 23ins-12ins/23ins-12ins diplotypes at the significance threshold than expected in the offspring of ♂ 23ins-12ins/23del-12del × ♀ 23ins-12ins/23del-12del parents.

biochemical genetics

Abnormal Segregation of Alleles and Haplotypes at the Polymorphic Site of the PRNP Gene Within Promoter and Intron 1 Regions in Polish Holstein–Friesian Cattle