Genome-wide analysis of TNF-alpha response in pigs challenged with porcine circovirus 2b

C. A. Kreikemeier, T. B. Engle, K. L. Lucot, S. D. Kachman, T. E. Burkey, D. C. Ciobanu

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Tumor necrosis factor alpha (TNF-α) is a pro-inflammatory cytokine with a role in activating adaptive immunity to viral infections. By inhibiting the capacity of plasmacytoid dendritic cells to produce interferon-α and TNF-α, porcine circovirus 2 (PCV2) limits the maturation of myeloid dendritic cells and impairs their ability to recognize viral and bacterial antigens. Previously, we reported QTL for viremia and immune response in PCV2-infected pigs. In this study, we analyzed phenotypic and genetic relationships between TNF-α protein levels, a potential indicator of predisposition to PCV2 co-infection, and PCV2 susceptibility. Following experimental challenge with PCV2b, TNF-α reached the peak at 21 days post-infection (dpi), at which time a difference was observed between pigs that expressed extreme variation in viremia and growth (P < 0.10). A genome-wide association study (n = 297) revealed that genotypes of 56 433 SNPs explained 73.9% of the variation in TNF-α at 21 dpi. Major SNPs were identified on SSC8, SSC10 and SSC14. Haplotypes based on SNPs from a SSC8 (9 Mb) 1-Mb window were associated with variation in TNF-α (P < 0.02), IgG (P = 0.05) and IgM (P < 0.13) levels at 21 dpi. Potential overlap of regulatory mechanisms was supported by the correlations between genomic prediction values of TNF-α and PCV2 antibodies (21 dpi, r > 0.22), viremia (14-21 dpi, P > 0.29) and viral load (r = 0.31, P < 0.0001). Characterization of the QTL regions uncovered genes that could influence variation in TNF-α levels as well as T- and B-cell development, which can affect disease susceptibility.

Original languageEnglish (US)
Pages (from-to)205-208
Number of pages4
JournalAnimal genetics
Volume46
Issue number2
DOIs
StatePublished - Apr 1 2015

Keywords

  • immunity
  • porcine circovirus 2
  • swine
  • tumor necrosis factor alpha

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Genetics

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