Fig. 3

Overview of In-Fusion^®-based cloning of two gRNA targets for paired nickases (Cas9-D10A). a Illustration of cloning strategy. Schematics of final gRNA cassette is shown in the top panel. Using a set of four universal primers (p1F, p2F, g1R and g2R) and four target-specific primers (g1F and p1R for protospacer target 1, and g2F and p2R for protospacer target 2), four fragments, A, B, C and D are PCR amplified using pEn-Chimera-ccdB plasmid in Round 1 PCR. In Round 2 PCR, using primers p1F and g1R, fragments A and B are fused resulting in fragment AB, and using primers p2F and g2R, fragments C and D are fused resulting in fragment CD. In Step 3, fragments AB and CD are cloned into pDe-Cas9-D10A or pUC57GW using the In-Fusion^® HD cloning system. b A representative gel picture showing PCR fragments of YFP upper panel, SlMLO1, NbPDS and mCherry lower panel. Expected sizes of each fragment are shown on the left. c Protospacer sequences of the targeted genes (YFP upper panel, NbPDS middle panel, and mCherry lower panel) are highlighted in purple background and the PAM sequences NGG in red background