AAV with GFAP(0.7) promoter driven hChR2(C128S)-TdTomato

This AAV expresses hChR2(C128S)-TdTomato driven by an astrocyte GFAP(0.7) promoter.

This 0.7 Kb novel GFAP promoter was constructed by ligating several key regulatory elements of the 2.2Kb human GFAP promoter. It drives essentially the same expression pattern as the parental 2.2 Kb GFAP promoter but with two-fold greater activity.

hChR2 is a humanized version of ChR2 for mammalian expression. Wild-type ChR2, as well as a few of its mutations, provides the fastest excitation of the channelrhodopsins offered, and is widely used in in optogenetics techniques in neuroscience. Mutations at C128 (C128A, C128S, C128T) can extend depolarization up to seconds or even minutes; they are sometimes referred to as step-function opsins or SFOs. hChR2(C128S) provides for a 1.7-minute open-state lifetime and shows moderate expression in the hippocampal neurons and Pichia pastoris. Like C128T, it is inactivated at strong light.