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cDNA cloning, genomic structure and mRNA expression pattern of porcine type I interferons receptor 2 gene.

Int. J. Immunogenet.2011 Aug;38(4):339-45. doi:10.1111/j.1744-313X.2011.01018.x. Epub 2011 Jun 07
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摘要


Type I interferons (IFN) are important mediators of the host defence against viruses through binding to the cell surface receptors, among which the binding to type I IFN receptor 2 (IFNAR2) is the very first step initiating a complex signal transduction cascade. By using RT-PCR and 5' RACE approaches, we obtained porcine IFNAR2 cDNA, the nucleotide identity of its coding region is 57.53%, 67.45%, 74.07% and 74.63% to those of mouse, human, sheep and cattle, respectively; and the deduced protein of which shares 38.18%, 55.29%, 62.01% and 63.39% identity to those of mouse, human, sheep and cattle, respectively. The genomic structure of porcine IFNAR2 gene consists of nine exons and eight introns. Porcine IFNAR2 mRNA expression was detected in all tissues examined, being strong in the spleen, small intestine, cerebrum and uterus tissues and relatively weak in the stomach tissues. As compared with piglets, the expression of IFNAR2 mRNA was significantly higher in both liver and spleen of Laiwu adult pigs (P < 0.01); in Duroc pigs, however, significantly higher IFNAR2 mRNA expression was only found in adult liver (P < 0.05). In Duroc × Landrace × Yorkshire commercial pigs infected with porcine reproductive and respiratory syndrome virus (PRRSV), the expression of IFNAR2 mRNA in lung tissue was significantly down-regulated as compared to uninfected ones (P < 0.05).

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