Astrocyte-originated connection mapping of presynaptic neurons using the rabies virus tracer
Astrocytes communicate bidirectionally with neurons by forming close contacts to synapses called tripartite synapses. Hundreds of thousands of synapses are embedded in a territory of single astrocytes, however, how astrocytes are functionally built into the neuronal circuits remains undetermined. To address this, we adopted the rabies virus (RV) for retrograde tracing of neuron-to-astrocyte connections in the mouse cerebral cortex. To sparsely and specifically transduce astrocytes with RV, a transposon vector expressing TVA, RV glycoprotein, and tdTomato under an astrocyte-specific promoter Gf