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J Gen Virol. 2009 Dec;90(Pt 12):2990-4. doi: 10.1099/vir.0.015727-0. Epub 2009 Sep 2.

Strong interferon-inducing capacity of a highly virulent variant of influenza A virus strain PR8 with deletions in the NS1 gene.

Author information

  • 1Department of Virology, University of Freiburg, D-79008 Freiburg, Germany. georg.kochs@uniklinik-freiburg.de

Abstract

Influenza viruses lacking the interferon (IFN)-antagonistic non-structural NS1 protein are strongly attenuated. Here, we show that mutants of a highly virulent variant of A/PR/8/34 (H1N1) carrying either a complete deletion or C-terminal truncations of NS1 were far more potent inducers of IFN in infected mice than NS1 mutants derived from standard A/PR/8/34. Efficient induction of IFN correlated with successful initial virus replication in mouse lungs, indicating that the IFN response is boosted by enhanced viral activity. As the new NS1 mutants can be handled in standard biosafety laboratories, they represent convenient novel tools for studying virus-induced IFN expression in vivo.

PMID:
19726611
[PubMed - indexed for MEDLINE]
PMCID:
PMC2887554
Free PMC Article

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