Abstract
Influenza virus RNA (vRNA) promoter panhandle structures are believed to be sensed by retinoic acid-inducible gene I (RIG-I). The occurrence of mismatches in this double-stranded RNA structure raises questions about their effect on innate sensing. Our results suggest that mismatches in vRNA promoters decrease binding to RIG-I in vivo, affecting RNA/RIG-I complex formation and preventing RIG-I activation. These results can be inferred to apply to other viruses and suggest that mismatches may represent a general viral strategy to escape RIG-I sensing.
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