Heterogeneity in viral replication dynamics shapes the antiviral response
Bruurs, L. J. M.; Müller, M.; Schipper, J. G.; Rabouw, H. H.; Boersma, S.; van Kuppeveld, F. J. M.; Tanenbaum, M. E.
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In response to virus infection, host cells can activate antiviral signaling to restrict virus replication and communicate viral infection to neighboring cells. For poorly understood reasons, antiviral response activation is highly heterogeneous among infected cells; both quantitatively (level of pathway activation) and qualitatively (transcribed antiviral gene set). Here, we used live-cell single-molecule imaging to simultaneously visualize viral infection and antiviral signaling, providing quantitative insights into antiviral response activation in single cells; first, the probability of activating an antiviral response varies throughout infection, with most efficient activation occurring several hours after the first viral replication. Second, cell-to-cell heterogeneity in viral replication rates early in infection determine the efficiency of antiviral response activation. Finally, variation in signaling strength of the viral sensing pathway result in qualitatively distinct antiviral responses. Together, this works identifies key parameters that shape the antiviral response and provides quantitative insights into the origin of heterogeneity in the antiviral response.
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