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. 2016 Oct 3;7:13056. doi: 10.1038/ncomms13056

Figure 4. Two-input and two-output sensory switch.

Figure 4

(a) Schematic representation of a two-input and two-output sensory switch by swapping split dCas9 domains that recognize two different PAM sequences. The dCas9 constituents are split at residue 713. The light blue rectangle represents the mutant dCas9 domain (VRER) that can recognize the NGCG PAM sequences but not the NGG PAM sequences. The ModTRE2 promoter contains seven repeats of gRNAb binding sites with the NGCG PAM sequences upstream of a miniCMV core. (b) Setting states of the sensory switch by artificial shRNA-FF5 and shRNA-FF4. Representative scatter plots and microscopic images are shown in the right panel. Each red scale bar in images represents 50 μm. (c) The response of the sensory switch to varying amount of shRNA-FF4. The solid line was plotted by qplot function in R package. (b,c) Each bar or data point shows mean fold changes (mean±s.e.m.; n=3) of EYFP or mKate2 measured by using flow cytometer 48 h after transfection.