ArticleViruses2025
Simultaneous Packaging of Two Different RNA Segments into an Influenza C Virus-like Particle Occurs Inefficiently.
Article in Viruses, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Reverse genetics systems for influenza C virus encounter challenges due to the inefficient production of infectious virus particles. In the present study, we explored the underlying cause by assessing the efficiency of generating influenza C virus-like particles (C-VLPs) containing specific virus RNA (vRNA) segments. Using 293T cells transfected with plasmids encoding GFP- and DsRed2-vRNAs (each flanked by the non-coding regions of Segments 5 and 6, respectively), along with plasmids expressing virus proteins, we observed that C-VLPs containing a single vRNA segment were generated efficiently. However, the simultaneous packaging of two vRNA segments into a single C-VLP was less frequent, as demonstrated by flow cytometry and reverse-transcription PCR analyses. Statistical evaluations revealed a decreased efficiency of incorporating multiple vRNA segments into single particles, which likely contributes to the reduced production of infectious virus particles in reverse genetics systems. These findings highlight a critical limitation in the vRNA incorporation mechanism of influenza C virus, contrasting with that of influenza A virus. Hence, further studies are required to elucidate specific vRNA packaging signals and optimize vRNA expression levels to improve the production of infectious influenza C virus particles.
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