Specific targeting of brain endothelial cells using enhancer AAV vectors

Area of Science:

• Neuroscience
• Molecular Biology
• Biotechnology

Background:

• Brain endothelial cells (BECs) form the blood-brain barrier (BBB), crucial for brain function.
• Existing adeno-associated virus (AAV) capsids show limited specificity for endothelial cells, varying with delivery conditions.

Purpose of the Study:

• To develop novel BEC-enhancer AAV vectors for precise targeting of BECs.
• To leverage cis-regulatory elements from single-cell epigenetic data for enhanced vector specificity.

Main Methods:

• Identification of cis-regulatory elements from single-cell epigenetic datasets.
• Engineering of new BEC-enhancer AAV vectors.
• Ex vivo and in vivo characterization in wild-type, reporter, and Alzheimer's disease model mouse brains.

Main Results:

• BEC-enhancer AAVs demonstrated high transduction selectivity for BECs.
• Minimal off-target transduction was observed in the liver.
• Effective targeting of brain vasculature via systemic administration.

Conclusions:

• Developed BEC-enhancer AAVs are effective tools for specific genetic payload delivery to BECs.
• These vectors offer minimally invasive routes for brain studies in normal and disease states.
• Potential applications in neuroscience research and therapeutic development for brain disorders.