Activation and expression of the transgene.

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Activation and expression of the transgene. Activation and expression of the transgene. Targeting of the optic fibers. A, The mice expressing archaerhodopsin in the hippocampal CA1 cells were obtained by crossing the homozygous transgenic Tg29 (T29-1) strain expressing the Cre recombinase in the targeted cells with the homozygous Ai35 strain carrying an archaerhodopsin-EGFP transgene at the Rosa26 locus that can be activated by the Cre recombinase B, Dark-field image of a paraformaldehyde-fixed, unstained section showing the targeting of the optic fiber into the stratum oriens. The trace left by the fiber (four-point star) is visible above the stratum pyramidale (arrowhead). C, The CA1 area of the hippocampus, the four-point star indicates the startum radiatum and the startum pyramidale is visible between the two arrows. Of note, the perisomatic region of the pyramidal cells contains little of the exogenous protein while their dendrites light up, consistently with the membrane targeted expression. The strong green signal in the CA1 is derived from the apical and the basal dendrites of the pyramidal neurons in the stratum pyramidale. D, Comparison of the expression in CA1 and CA3. The large arrow points to the CA2 on the right hand side of which the CA1 shows strong expression. On the left hand side the cells of the CA3 show minimal expression with the stratum lucidum lighting up (small arrowhead) as a result of strong expression in the granule cells of the dentate gyrus. E, A close-up on the lower blade of the dentate gyrus, where membrane localization can be suspected even when using traditional light microscopy (similar membrane localization was seen in the CA1 region when the Arch-EGFP transgene was activated only in a few CA1 cells in a different genetic intercross) The two arrowheads point to two cells with a suspected stretch of Arch-EGFP rich plasma membrane. F, The CA1 fibers terminating in the subiculum (large arrowhead) and the stratum moleculare of the dentate gyrus (small arrowhead) express strongly the gene construct, and this can be compared to the extremely low level of expression in the subcortical structures (four-point star). Scale bars: 100 µm (C, D) 200 µm (E, F), and 500 µm (B). C–F, EGFP fluorescence is visualized using light microscopy Dámaris K. Rangel Guerrero et al. eNeuro 2018;5:ENEURO.0087-18.2018 ©2018 by Society for Neuroscience