EF1a-HA-hM4D(Gi)-mCherry AAV (Serotype 9)

EF1a-HA-hM4D(Gi)-mCherry AAV (serotype 9) is a highly specialized tool for neuroscience research, particularly for the study of brain circuits and neuronal activity. These pre-made adeno-associated virus (AAV) particles are engineered to deliver genetic material into cells using a serotype 9 capsid. This particular serotype is favored for its ability to efficiently transduce neurons and cross the blood-brain barrier when administered systemically.

The EF1a-HA-hM4D(Gi)-mCherry construct contains several key elements. The EF1a promoter is a ubiquitous mammalian promoter that ensures stable and sustained expression of the transgene in a variety of tissues, including neuronal tissue. The HA-hM4D(Gi)-mCherry assembly contains two main components: HA-hM4D(Gi) and the mCherry fluorescent protein. hM4D(Gi) is a custom G protein-coupled receptor that is specifically designed to be activated by the otherwise pharmacologically inert compound clozapine-N-oxide (CNO). This chemical genetics approach allows researchers to remotely control neuronal activity, providing a valuable method to interrogate the role of specific neurons in complex behavioral and physiological processes. The HA tag facilitates protein detection and purification. Attached to hM4D(Gi) is mCherry, a red fluorescent protein that serves as a reporter gene, allowing scientists to visually confirm receptor expression and localization within tissues.