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. 2017 Nov 7;7:14641. doi: 10.1038/s41598-017-15269-w

Figure 1.

Figure 1

Mammalian cell lines transfected with CHIKV-D-Luc-SGR. (a) Schematic of the CHIKV genome and the corresponding dual luciferase replicon (CHIKV-D-luc-SGR). Renilla luciferase (Rluc) is present in the hypervariable region of nsP3, indicating both input translation and early replication levels. Firefly luciferase (Fluc) replaces the structural genes and is only expressed from a subgenomic RNA, thus indicating that RNA replication has occurred. Note that other SGRs used in this study have either no insertion into nsP3 (termed nsP3/SG-FLuc), or insertion of mCherry in place of Rluc and Gaussia luciferase in place of Fluc (nsP3-mCherry/SG-GLuc). (b) Liver (Huh7, HepG2), muscle (C2C12, RD), brain (SVG-A), fibroblasts (Dermal fibs, BHKs), as well as Vero, HeLa and A549 cells were transfected with CHIKV-D-Luc-SGR RNA. Cell lysates were taken at indicated time points over a 48 h period and luciferase assayed (n = 3 experimental replicates, all luciferase signal normalised to a mock-transfected control). (c) Western blot of nsP3 in mammalian cell lines. Cells were transfected with wildtype (untagged) nsP3/SG-FLuc replicon, lysed at 24 hpt and Western blotted for CHIKV nsP3.