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. 2023 Mar 17;12:e83760. doi: 10.7554/eLife.83760

Figure 2. Virally delivered CRISPR-Cas9 complex targeting the Ntn1 locus results in a significant reduction in Ntn1 antibody staining.

Figure 2.

(A–B) Schematics summarizing cell type-specific knockout procedure. (A) Adult mice were injected bilaterally into the VTA with AAV-FLEX-SaCas9-HA-sgNtn1 and AAV-FLEX-YFP. Control mice received an equivalent volume of -sgRosa26 and/or AAV-FLEX-YFP. SaCas9 is virally delivered into the genome in the inactive orientation and returned to the active orientation only in the presence of Cre recombinase, limiting Cas9 expression to target cells. (B) Schematic of the VTA (left) showing VTA GABA neurons project to and inhibit VTA dopamine neurons. By using transgenic Cre-driver mouse lines (right) viral delivery of SaCas9 results in gene disruption in specifically VTA dopamine neurons (DAT-Cre mice, top panel), or VTA GABA neurons (Vgat-Cre mice, bottom panel). (D) Example images for Th (cyan) and Ntn1 (red) immunostaining in the ventral tegmental area (VTA) of mice injected with control or sgNtn1 CRISPR virus. (E) Quantification of the percentage of Th + cells co-labled with Ntn1 (Students t-test; t=8.179, df = 10, 62.25 ± 5.796 vs 9.586 ± 2.807, ****p<0.0001).

Figure 2—source data 1. Cell counts.