Foot-and-mouth disease (FMD) is a highly contagious disease that afflicts cloven-hoofed animals. The etiological agent of FMD is foot-and-mouth disease virus (FMDV). The VP1 gene of FMDV is essential during the life cycle of the virus and plays a key role in the attachment of the virus to susceptible cells. We constructed a plasmid, pCWN11, that expresses siRNAs multiple-targeting the VP1 genes of FMDV. We evaluated the gene silencing efficiency of the plasmid using an enhanced green fluorescent protein (EGFP) reporter system in BHK-21 cells. The antiviral potential of the plasmid in BHK-21 cells and suckling mice were investigated. The results indicate that cotransfection of pCWN11 with any one of three serotypes VP1-EGFP plasmids resulted in a reduction in the EGFP signal relative to the control. Moreover, the antiviral potential induced by pCWN11 was evident during challenge with one FMDV isolate of either serotype O (HKN/2002) or serotype Asia I (YNBS/58), and the inhibition extended to almost 40 h. Furthermore, subcutaneous injection of pCWN11 in the neck made suckling mice significantly less susceptible to FMDV serotype O and Asia I.
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We thank Peng Hao, Xuecen Xie, Lijun Wang, Yanhong Zhang, Yanqi Sun and Tailiang Sun for technical assistance.
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Cong, W., Cui, S., Chen, J. et al. Construction of a multiple targeting RNAi plasmid that inhibits target gene expression and FMDV replication in BHK-21 cells and suckling mice. Vet Res Commun 34, 335–346 (2010). https://doi.org/10.1007/s11259-010-9360-y
- VP1 gene
- RNA interference (RNAi)
- Multiple targeting plasmid