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1 Laboratory of Virology, Wageningen University, Binnenhaven 11, 6709 PD Wageningen, The Netherlands
2 Viruvation BV, Wassenaarseweg 72, 2333 AL Leiden, The Netherlands
Correspondence
Marcel Prins
marcel.prins{at}wur.nl
RNA silencing comprises a set of sequence-specific RNA degradation pathways that occur in a wide range of eukaryotes, including animals, fungi and plants. A hallmark of RNA silencing is the presence of small interfering RNA molecules (siRNAs). The siRNAs are generated by cleavage of larger double-stranded RNAs (dsRNAs) and provide the sequence specificity for degradation of cognate RNA molecules. In plants, RNA silencing plays a key role in developmental processes and in control of virus replication. It has been shown that many plant viruses encode proteins, denoted RNA silencing suppressors, that interfere with this antiviral response. Although RNA silencing has been shown to occur in vertebrates, no relationship with inhibition of virus replication has been demonstrated to date. Here we show that the NS1 protein of human influenza A virus has an RNA silencing suppression activity in plants, similar to established RNA silencing suppressor proteins of plant viruses. In addition, NS1 was shown to be capable of binding siRNAs. The data presented here fit with a potential role for NS1 in counteracting innate antiviral responses in vertebrates by sequestering siRNAs.
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