Abstract
The main aims of the present study were to characterize NS1 protein from H9N2 avian influenza viruses (AIVs) isolated in Israel and to investigate the possibility to use NS1-based indirect ELISA. To achieve these purposes, the non-structural gene (NS1) of 79 AIVs of the H9N2 subtype isolated in Israel in 2000–2009 was sequenced and genetically analyzed. The phylogenetic analysis demonstrated that four distinct introductions of H9N2 occurred in Israel during this period. Analysis of the inferred amino acid sequences of the NS1 proteins showed high, about 10%, differences between viruses of the 3rd and 4th introductions. Antibodies against NS1 protein in immune sera were tested by means of indirect ELISA using recombinant NS1 as antigen. Immune sera were obtained from experimentally H9N2-infected chicken after infection on 4, 7, 10, 14, and 21 days. All sera from chickens experimentally infected with 3rd- or 4th-introduction AIV contained anti-NS1 antibodies that were detected by enzyme-linked immunosorbent assay (NS1-ELISA) even though the recombinant NS1 used as antigen for NS1-ELISA differed significantly in its amino acid sequences from the NS1 protein of AIV that caused infection in experimental birds. These findings indicate that the sites of the NS1 protein by which viruses belonging to 3rd and 4th introduction are out of antigenic epitope positions were responsible for the results of NS1-based iELISA.
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Acknowledgments
We thank Mrs. Rivi Ascarelli-Goell, MSc, Mrs. Magda David, MSc, and Mrs. Faina Golender for excellent technical assistance. This study was supported by the Kameya Grant of the Israel Ministry of Absorption, by Research Grant No. IS-3679-05 from BARD, the United States-Israel Binational Agricultural Research and Development Fund, and by Grant No. 847-0319 from the Poultry Association of the Israel Ministry of Agriculture and Rural Development.
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Panshin, A., Golender, N., Davidson, I. et al. Variability of NS1 proteins among H9N2 avian influenza viruses isolated in Israel during 2000–2009. Virus Genes 41, 396–405 (2010). https://doi.org/10.1007/s11262-010-0522-3
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DOI: https://doi.org/10.1007/s11262-010-0522-3