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. 2023 Nov 30;52(2):977–997. doi: 10.1093/nar/gkad1125

Figure 4.

Figure 4.

Lipid-conjugated P.O.s promote editing of C20, co-delivered with AAV vector expressing tracrRNA, in the CNS of Cas9-expressing reporter mice. (A) Schematic representation of the transgene constructs of Cas9/mTmG+/+ double transgenic mouse model and the experimental process to test AAV co-delivery in vivo in the mouse CNS. Cleavage at sites flanking the mTmG tdTomato cassette activate EGFP expression. (B) Chemical modifications of the P.O.s used in this experiment. d(TT)-DHA, docosahexaenoic acid with a nuclease-cleavable d(TT)-PO-C7 linker; DHA, docosahexaenoic acid; d(TT)-TegChol, tetra-ethylene-glycol-linked cholesterol with a cleavable d(TT)-PO-C7 linker; TegChol, tetra-ethylene-glycol-linked cholesterol. (C) Immunohistochemistry (IHC) staining of mouse brain tissue sections using an anti-EGFP antibody. Adult Cas9/mTmG+/+ mice were injected with scAAV9-tracrRNA and subsequently injected with C20 and different P.O.s as indicated on the upper left of each image. (D) ImageJ quantification of percentages of EGFP positive cells within 1 mm2 area around the site of injection (n = 8 mice per group). Data represent mean ± SD; **** P < 0.0001 (one-way ANOVA).