A Designer AAV Variant Permits Efficient Retrograde Access to Projection Neurons

Area of Science:

• Neuroscience
• Molecular Biology
• Gene Therapy

Background:

• Efficient retrograde access to projection neurons is crucial for neural circuit dissection and gene therapy.
• Current viral vectors for the nervous system have limitations in retrograde transport efficiency and clinical applicability.
• Neurodegenerative disorders often involve pathological spread through interconnected neuronal networks.

Purpose of the Study:

• To engineer a novel adeno-associated virus (AAV) vector with enhanced retrograde transport capabilities.
• To develop a tool for efficient gene delivery to projection neurons for circuit interrogation and therapeutic applications.
• To improve upon existing viral vectors for neuroscience research and clinical gene therapy.

Main Methods:

• Application of in vivo directed evolution to modify the adeno-associated virus (AAV) capsid.
• Engineering for potent retrograde functionality within the viral vector.
• Testing the efficacy of the evolved variant (rAAV2-retro) in comparison to existing methods.

Main Results:

• A new AAV variant, rAAV2-retro, was evolved with potent retrograde functionality.
• rAAV2-retro demonstrated robust retrograde access to projection neurons, achieving efficiency comparable to synthetic tracers.
• Sufficient sensor and effector expression was achieved for functional circuit interrogation and in vivo genome editing.

Conclusions:

• The engineered rAAV2-retro vector provides efficient retrograde access to projection neurons.
• This novel vector enables robust gene delivery for neural circuit analysis and gene editing.
• rAAV2-retro represents a significant advancement for neuroscience research and potential clinical applications in treating neurological disorders.