Key result
The HA5m2 mutant virus exhibited an 87% reduced growth rate and a defect in HA vRNA packaging, which were restored by compensatory mutations in the 5' packaging signals of HA and PB2 vRNAs.
Why the study?
Selective packaging of the eight influenza A virus vRNAs into progeny virions likely involves specific segment interactions via packaging signals, but the vRNA(s) interacting with HA vRNA remained to be identified.
Population
Influenza A virus
Comparison
HA 5m2 mutant virus vs wild-type or passaged virus
Design
In vitro experimental study
Authors
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May guide attenuated influenza strain design; leaves open translation to vaccines or in vivo models.
Direct RNA-RNA interactions between the 5' packaging signals of HA and PB2 vRNAs are crucial for selective genome packaging in influenza A virus.
Miyamoto et al. (2020) studied Influenza A virus. HA5m2 mutant virus vs. Wild-type virus was evaluated on Viral replication and HA vRNA packaging efficiency. The HA5m2 mutant virus exhibited an 87% reduced growth rate and a defect in HA vRNA packaging, which were restored by compensatory mutations in the 5' packaging signals of HA and PB2 vRNAs.
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