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The Consequences of Reconfiguring the Ambisense S Genome Segment of Rift Valley Fever Virus on Viral Replication in Mammalian and Mosquito Cells and for Genome Packaging

Figure 1

Creation of rMP12:S-Swap.

A. Schematic of the transcription and replication products of the S segments of rMP12 and rMP12:S-Swap. The sites at which oligonucleotides 1 and 2 anneal are indicated. B. Agarose gel showing RT-PCR products to confirm structure of S segment. BHK-21 cells were infected with rMP12 (MP12) or rMP12:S-Swap (SWAP) viruses at an MOI of 1. Total cellular RNA was extracted at 48 h p.i., and S-segment RT-PCR was performed. As a control, PCR on the appropriate cDNA-containing plasmids was performed with the same primers. C. Titres of recombinant virus stocks from multiple independent preparations were determined by plaque assay in BHK-21 cells. The mean titre and standard error of n = 4 preparations of each recombinant virus stock are shown (* p>0.05) D. Comparison of plaque sizes of rMP12, rMP12:S-Swap, rMP12ΔNSs:eGFP or rMP12:S-SwapΔNSs:eGFP on BHK-21 cells. Cell monolayers were fixed at 96 h p.i. with 4% paraformaldehyde and stained with Giemsa solution.

Figure 1