Genotypic profile of Pantanal creole sheep regarding susceptibility or resistance to scrapie

Abstract

-The objective of this work was to determine the genotypic profile specific to scrapie in codons 136, 154, and 171 of the PRNP gene of the Pantanal creole sheep. Genomic DNA was extracted from blood samples collected from 66 sheep, and the regions of interest on the DNA strand were amplified by PCR. Five haplotypes were identified: ARR, alanine, arginine, arginine; ARQ, alanine, arginine, glutamine; AHQ, alanine, histidine, glutamine; ARH, alanine, arginine, histidine; and VRQ, valine, arginine, glutamine. The most common genotypes were ARQ/ARQ (27%) and ARR/ARQ (24%). The genotypic profile of the Pantanal creole sheep shows low to moderate susceptibility.Index terms: genotyping, PRNP gene, single nucleotide polymorphisms, transmissible spongiform encephalopathies. Perfil genotípico de ovinos Crioulos pantaneiros quanto à suscetibilidade ou resistência à scrapieResumo -O objetivo deste trabalho foi avaliar o perfil genotípico específico para scrapie, nos códons 136, 154 e 171, no gene PRNP de ovinos Crioulos pantaneiros. O DNA genômico foi extraído de amostras de sangue de 66 ovinos, e as regiões de interesse da fita de DNA foram amplificadas por PCR. Foram identificados