Pullorum disease is caused by Salmonella Pullorum and does a great loss to the poultry industry. As a universal innate immune gene, Myeloid differentiation primary response gene 88 (MyD88) can activate the nuclear factor-κB (NF-κB) pathway and regulate downstream gene expression. Single nucleotide polymorphisms (SNPs) in the coding regions (CDS) of the MyD88 gene have also been reported to be associated with inter-subject differences in responses to Salmonella Pullorum infection in chickens. However, whether the 3’-untranslated region (3’-UTR) of the MyD88 gene is associated with resistance to Salmonella Pullorum infection still remains unknown. In this study, a total of eight SNPs, including three novel mutations [SNP4 (A4812316G), SNP6 (C4813363A) and SNP7 (C4813618T)] and five known loci, were found within 3292 bp sequenced fragments. The allele frequency and genotype frequency of SNP4 (A4812316G) were found to be significantly different (P<0.05) between the case and control groups. However, no significant differences were found in the haplotypes of SNP1 and SNP2 (P>0.05). These results suggest that SNP4 (A4812316G) in the 3’-UTR of the MyD88 gene is linked to genetic resistance to Salmonella Pullorum infection and may provide an important reference for the marker-assisted selection of chickens during disease-resistance breeding.
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