Abstract
Influenza A virus is an enveloped virus with a segmented genome consisting of eight negative-sense, single-stranded RNAs. Accumulating evidence has revealed that influenza viruses selectively package their genomes. However, less is known about how different viral RNA segments are selected for incorporation into progeny virions. Understanding the trafficking routes and assembly process of various viral RNA segments during infection will shed light on the mechanisms of selective genome packaging for influenza A viruses. This chapter describes the single-molecule sensitivity RNA fluorescence in situ hybridization assay (smFISH) for influenza viral RNAs, a method used to analyze the distributions and trafficking of viral RNAs in infected cells with segment specificity. Hybridization using 20 or more short fluorescently labeled DNA probes allows the detection of viral RNAs with single-molecule sensitivity. The following imaging analyses provide information regarding quantitative measurements of vRNA abundance and the relative positions of the different viral RNA segments in cells. This chapter also includes a protocol for combining immunofluorescence techniques with smFISH, which is useful to analyze the positions of viral RNAs relative to viral/cellular proteins in infected cells.
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Supplementary Table 1
An example probe set designed for the PB1 segment of influenza A virus A/Puerto Rico/8/34, PR8 strain (DOCX 114 kb)
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Chou, Yy., Lionnet, T. (2018). Single-Molecule Sensitivity RNA FISH Analysis of Influenza Virus Genome Trafficking. In: Yamauchi, Y. (eds) Influenza Virus. Methods in Molecular Biology, vol 1836. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8678-1_10
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DOI: https://doi.org/10.1007/978-1-4939-8678-1_10
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