1887

Abstract

The currently available reverse-genetics systems for are all based on transcription of genomic RNA by RNA polymerase I, but the species specificity of this polymerase is a disadvantage. A reverse-genetics vector containing a T7 RNA polymerase promoter, hepatitis delta virus ribozyme sequence and T7 RNA polymerase terminator sequence has been developed. To achieve optimal expression in minigenome assays, it was determined that viral RNA should be inserted in this vector in the negative-sense orientation with two additional G residues downstream of the T7 RNA polymerase promoter. It was also shown that expression of the minigenome was more efficient when a T7 RNA polymerase with a nuclear-localization signal was used. By using this reverse-genetics system, recombinant influenza virus A/PR/8/34 was produced more efficiently than by using a similar polymerase I-based reverse-genetics system. Furthermore, influenza virus A/NL/219/03 could be rescued from 293T, MDCK and QT6 cells. Thus, a reverse-genetics system for the rescue of has been developed, which will be useful for fundamental research and vaccine seed strain production in a variety of cell lines.

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2007-04-01
2019-11-18
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