The Effect of Single Nucleotide Polymorphisms in the Tumor Necrosis Factor-α Gene on Reproductive Performance and Immune Function in Dairy Cattle

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  • KAWASAKI Yurie
    Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan
  • AOKI Yuka
    Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan
  • MAGATA Fumie
    Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan
  • MIYAMOTO Akio
    Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan
  • KAWASHIMA Chiho
    Field Center of Animal Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan
  • HOJO Takuo
    Laboratory of Reproductive Endocrinology, Graduate School of Natural Science and Technology, Okayama University, 700-8530 Okayama, Japan
  • OKUDA Kiyoshi
    Laboratory of Reproductive Endocrinology, Graduate School of Natural Science and Technology, Okayama University, 700-8530 Okayama, Japan
  • SHIRASUNA Koumei
    Division of Bioimaging Sciences, Center for Molecular Medicine, Jichi Medical University, 329-0498 Tochigi, Japan
  • SHIMIZU Takashi
    Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, 080-8555 Obihiro, Japan

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The present study aimed to assess the effect of polymorphisms in the tumor necrosis factor α (TNF-α) promoter (A/A, A/G and G/G) and exons (T/T, T/C and C/C) on immune function and reproductive performance in dairy cows. The occurrence of the first postpartum ovulation within 3 weeks in the cows with the TNF-α promoter A/G and G/G genotypes was higher than in the A/A group. Among the different TNF-α exon genotypes, the occurrence of early first postpartum ovulation was higher in the T/C and C/C genotype groups than in the T/T group. Single nucleotide polymorphisms (SNPs) in the TNF-α gene did not affect the rate of artificial insemination (AI) or duration from parturition to next conception (days open). The apoptosis rate of polymorphonuclear leukocytes (PMNs) did not differ among the TNF-α promoter genotypes, but the PMN transmigration rate was significantly higher for the A/A and A/G genotypes than for the G/G genotype. Interleukin 8 (IL-8) mRNA expression in PMNs and peripheral blood mononuclear cells (PBMCs) before culture was significantly higher for the A/A genotype compared with the G/G genotype. There were no significant differences between the genotypes in the mRNA expression of TNF-α, IL-6, IL-1β, and toll-like receptor 4 (TLR4) in PMNs and PBMCs before and 4 h after culture. IL-8 and IL-1β production by PBMCs cultured for 4 h was significantly higher for the animals with the A/A genotype than for those with the G/G genotype. On the other hand, no significant difference was observed in IL-8 and IL-1β production by PMNs among different TNF-α genotypes. Taken together, these results suggest that SNP in the TNF-α gene affects immune function and reproductive performance in dairy cows.

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