1887

Abstract

Recently, we developed a system for the generation of influenza A virus by cotransfecting only eight plasmids from which negative-sense vRNA and positive-sense mRNA are expressed (Hoffmann ., , 97, 6108–6113, 2000). Here we report the establishment of a different transcription system for the expression of virus-like RNAs, allowing the intracellular synthesis of noncapped positive-sense cRNA and 5′-capped mRNA from one template. Cotransfection of eight RNA pol I–pol II tandem promoter plasmids containing the cDNA of A/WSN/33 (H1N1) resulted in the generation of infectious influenza A virus, albeit with a lower yield than the bidirectional system. Our approach of producing either vRNA and mRNA or cRNA and mRNA intracellularly from a minimum set of plasmids should be useful for the establishment or optimization of reverse genetics systems for other RNA viruses.

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2000-12-01
2021-03-07
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