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• W2168026897 abstract "ABSTRACT The second gene in the 3′-to-5′ gene order in respiratory syncytial virus (RSV) encodes the nonstructural protein NS2, for which there is no assigned function. To study the function of NS2, we have used a recently developed reverse genetics system to ablate expression of NS2 in recombinant RSV. A full-length cDNA copy of the antigenome of RSV A2 strain under the control of a T7 promoter was modified by introduction of tandem termination codons within the NS2 open reading frame (NS2stop) or by deletion of the entire NS2 gene (ΔNS2). The NS2 knockout antigenomic cDNAs were cotransfected with plasmids encoding the N, P, L, and M2-1 proteins of RSV, each controlled by the T7 promoter, into cells infected with a vaccinia virus recombinant expressing T7 RNA polymerase. Recombinant NS2stop and ΔNS2 RSVs were recovered and characterized. Both types of NS2 knockout virus displayed pinpoint plaque morphology and grew more slowly than wild-type RSV. The expression of monocistronic mRNAs for the five genes examined (NS1, NS2, N, F, and L) was unchanged in cells infected with either type of NS2 knockout virus, except that no NS2 mRNA was detected with the ΔNS2 virus. Synthesis of readthrough mRNAs was affected only for the ΔNS2 virus, where the NS1-NS2, NS2-N, and NS1-NS2-N mRNAs were replaced with the predicted novel NS1-N mRNA. Upon passage, the NS2stop virus stock rapidly developed revertants which expressed NS2 protein and grew with similar plaque morphology and kinetics wild-type RSV. Sequence analysis confirmed that the termination codons had reverted to sense, albeit not the wild-type assignments, and provided evidence consistent with biased hypermutation. No revertants were recovered from recombinant ΔNS2 RSV. These results show that the NS2 protein is not essential for RSV replication, although its presence greatly improves virus growth in cell culture. The attenuated phenotype of these mutant viruses, coupled with the expected genetic stability associated with gene deletions, suggests that the ΔNS2 RSV is a candidate for vaccine development." @default.
• W2168026897 created "2016-06-24" @default.
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• W2168026897 date "1999-01-01" @default.
• W2168026897 modified "2023-09-23" @default.
• W2168026897 title "Altered Growth Characteristics of Recombinant Respiratory Syncytial Viruses Which Do Not Produce NS2 Protein" @default.
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• W2168026897 doi "https://doi.org/10.1128/jvi.73.1.466-473.1999" @default.
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