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- W2023351655 abstract "ABSTRACT The influenza A virus genome is composed of eight negative-sense RNA segments (called vRNAs), all of which must be packaged to produce an infectious virion. It is not clear whether individual vRNAs are packaged specifically or at random, however, and the total vRNA capacity of the virion is unknown. We have created modified forms of the viral nucleoprotein (NP), neuraminidase (NA), and nonstructural (NS) vRNAs that encode green or yellow fluorescent proteins and studied the efficiency with which these are packaged by using a plasmid-based influenza A virus assembly system. Packaging was assessed precisely and quantitatively by scoring transduction of the fluorescent markers in a single-round infectivity assay with a flow cytometer. We found that, under conditions in which virions are limiting, pairs of alternatively tagged vRNAs compete for packaging but do so in a nonspecific manner. Reporters representing different vRNAs were not packaged additively, as would be expected under specific packaging, but instead appeared to compete for a common niche in the virion. Moreover, 3 to 5% of transduction-competent viruses were found to incorporate two alternative reporters, regardless of whether those reporters represented the same or different vRNAs — a finding compatible with random, but not with specific, packaging. Probabilistic estimates suggest that in order to achieve this level of dual transduction by chance alone, each influenza A virus virion must package an average of 9 to 11 vRNAs." @default.
- W2023351655 created "2016-06-24" @default.
- W2023351655 creator A5035768241 @default.
- W2023351655 creator A5046373934 @default.
- W2023351655 date "2002-07-15" @default.
- W2023351655 modified "2023-10-16" @default.
- W2023351655 title "Evidence for Segment-Nonspecific Packaging of the Influenza A Virus Genome" @default.
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- W2023351655 doi "https://doi.org/10.1128/jvi.76.14.7133-7139.2002" @default.
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