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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Variation in the ability of human influenza A viruses to induce and inhibit the IFN-beta pathway.

We investigated the ability of a selection of human influenza A viruses, including recent clinical isolates, to induce IFN-beta production in cultured cell lines. In contrast to the well-characterized laboratory strain A/PR/8/34, several, but not all, recent isolates of H3N2 viruses resulted in moderate IFN-beta stimulation. Through the generation of recombinant viruses, we were able to show that this is not due to a loss of the ability of the NS1 genes to suppress IFN-beta induction; indeed, the NS1 genes behaved similarly with respect to their abilities to block dsRNA signaling. Interestingly, replication of A/Sydney/5/97 virus was less susceptible to pre-treatment with IFN-alpha than the other viruses. In contrast to the universal effect on dsRNA signaling, we noted differences in the effect of NS1 proteins on expression of interferon stimulated genes and also genes induced by a distinct pathway. The majority of NS1 proteins blocked expression from both IFN-dependent and TNF-dependent promoters by an apparent post-transcriptional mechanism. The NS1 gene of A/PR/8/34 NS1 did not confer these blocks. We noted striking differences in the cellular localization of different influenza A virus NS1 proteins during infection, which might explain differences in biological activity.[1]


  1. Variation in the ability of human influenza A viruses to induce and inhibit the IFN-beta pathway. Hayman, A., Comely, S., Lackenby, A., Murphy, S., McCauley, J., Goodbourn, S., Barclay, W. Virology (2006) [Pubmed]
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