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This article is part of the supplement: Proceedings of the International Symposium on Animal Genomics for Animal Health (AGAH 2010)

Open Access Proceedings

Preliminary association analysis of TLR9 gene polymorphisms and immune parameters in an Italian Holstein calves population

Elisabetta Catalani1, Alessandro Nardone1, Antonino Barone2, Maria Teresa Scicluna2, Gian Luca Autorino2, Andrea Caprioli2 and Nicola Lacetera1*

Author affiliations

1 Dipartimento di Produzioni Animali, Università degli Studi della Tuscia, Viterbo, 01100, Italy

2 Istituto Zooprofilattico Sperimentale Lazio e Toscana, Roma, 00178, Italy

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Citation and License

BMC Proceedings 2011, 5(Suppl 4):S20  doi:10.1186/1753-6561-5-S4-S20

Published: 3 June 2011

Abstract

Background

This preliminary study was aimed at evaluating the association between single nucleotide polymorphisms (SNPs) on Toll like receptor 9 (TLR9) gene and some immunological parameters in a population of Italian Holstein calves.

Methods

The study was carried out in a commercial farm on 68 Holstein calves aging about 6 months. Genomic DNA was extracted from peripheral blood mononuclear cells (PBMC) and genotyped for nine SNPs on TLR9. Immunological parameters considered were the immunoglobulin (Ig) G titers against bovine herpesvirus 1, and the proliferative response of peripheral blood mononuclear cells to mitogens. For the association study, only results relative to the SNP located in the promoter region have been discussed.

Results

Among the nine SNPs expected, only eight were detected. Considering the SNP located in the promoter region, all three possible genotypes were observed, and their distribution was as follows: genotype a (n=34), b (n=19), and c (n=8). On the basis of their response to vaccine, calves were categorized as low (L, n=8), medium (M, n=45) and high responders (H, n=8). Although no significant association was found between genotypes and L, M or H categories, the genotype estimated as the less represented within the population (c) had no calves categorized as H, the highest frequency of L (25%), and mean values of IgG lower (P < 0.005) compared to genotype b. Furthermore, IgG titers were positively correlated with responses of PBMC to mitogens.

Conclusions

Genotype c appeared to be “non advantageous” in terms of immune response. It was characterized by the presence of the mutation in homozygosity and, not surprisingly, it was the most rare genotype in the population. Larger studies are necessary in order to confirm these observations.