Figure 1. Schematic of the gSNA Platform Applied to the Mouse Brain.
(A) Pipeline and components of genetic single neuron anatomy (gSNA).
(B) Left: scheme of genetic and viral strategy for the labeling of axo-axonic cells (AACs). A transient CreER activity in MGE progenitors is converted to a constitutive Flp activity in mature AACs. Flp-dependent AAVs injected in specific cortical areas enables sparse and robust AAC labeling.
(C) fMOST high-resolution whole-brain imaging. Two-color imaging for the acquisition of GFP (green) channel and PI (propidium iodide, red) channel signals. PI stains brain cytoarchitecture in real time, and therefore provides each dataset with a self-registered atlas. A 488-nm wavelength laser was used for the excitation of both GFP and PI signals. Whole-brain coronal image stacks were obtained by sectioning (with a diamond knife) and imaging cycles at 1-μm z steps, guided by a motorized precision XYZ stage.