An enhancer-AAV toolbox to target and manipulate distinct interneuron subtypes.

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Viral vectors like recombinant adeno-associated virus (rAAV) are crucial for gene delivery in neuroscience.
• Existing enhancers for rAAV vectors can restrict transgene expression to specific neuronal populations.
• There is a need for more precise viral tools to access and manipulate distinct neuronal subtypes.

Purpose of the Study:

• To systematically identify and validate enhancer candidates for targeting specific telencephalic interneuron subtypes.
• To develop a set of enhancer-AAV tools with high specificity for cortical interneurons and striatal cholinergic interneurons.
• To provide versatile tools for observing and manipulating neuronal activity in targeted populations.

Main Methods:

• Systematic analysis of single-cell genomic data to identify potential enhancers.
• Construction and testing of enhancer-AAV vectors for specific neuronal targeting.
• Validation of enhancer-AAV tool specificity across different neuronal subtypes and species.

Main Results:

• Identification of novel enhancer candidates specific to telencephalic interneuron subtypes.
• Establishment of highly specific enhancer-AAV tools for cortical interneurons and striatal cholinergic interneurons.
• Demonstration of the utility of these tools for targeting, observing activity (GCaMP), and manipulating (optogenetics) specific neuronal subtypes.
• Cross-species validation of the developed enhancer-AAV tools.

Conclusions:

• The developed enhancer-AAV tools offer unprecedented specificity for targeting distinct neuronal subtypes.
• These tools significantly advance the ability to study neural circuits and functions.
• The findings provide a powerful resource for developing precise and targeted neurological therapies.