J. Virol., Jun 1996, 4188-4192, Vol 70, No. 6
S Pleschka, R Jaskunas, OG Engelhardt, T Zurcher, P Palese and A Garcia-Sastre
A reverse genetics system for negative-strand RNA viruses was first
successfully developed for influenza viruses. This technology involved the
transfection of in vitro-reconstituted ribonucleoprotein (RNP) complexes
into influenza virus-infected cells. We have now developed a method that
allows intracellular reconstitution of RNP complexes from plasmid-based
expression vectors. Expression of a viral RNA-like transcript is achieved
from a plasmid containing a truncated human polymerase I (polI) promoter
and a ribozyme sequence that generates the desired 3' end by autocatalytic
cleavage. The polI-driven plasmid is cotransfected into human 293 cells
with polII-responsive plasmids that express the viral PB1, PB2, PA, and NP
proteins. This exclusively plasmid-driven system results in the efficient
transcription and replication of the viral RNA-like reporter and allows the
study of cis- and trans-acting signals involved in the transcription and
replication of influenza virus RNAs. Using this system, we have also been
able to rescue a synthetic neuraminidase gene into a recombinant influenza
virus. This method represents a convenient alternative to the previously
established RNP transfection system.
Copyright © 1996, American Society for Microbiology
A plasmid-based reverse genetics system for influenza A virus
Department of Microbiology, Mount Sinai School of Medicine, New York 10029, USA.
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