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Related Experiment Video

Updated: Nov 10, 2025

Subtype-selective Electroporation of Cortical Interneurons

Subtype-selective Electroporation of Cortical Interneurons

Published on: August 18, 2014

Functional enhancer elements drive subclass-selective expression from mouse to primate neocortex.

John K Mich¹, Lucas T Graybuck¹, Erik E Hess¹

¹Allen Institute for Brain Science, Seattle, WA, USA.

|March 31, 2021

Summary

This summary is machine-generated.

Scientists developed new viral genetic tools for precise brain cell targeting. These tools, using adeno-associated virus (AAV) vectors and enhancer elements, show high specificity in targeting neuronal subclasses for neuroscience research and gene therapy.

Keywords:

AAVs ATAC-seq brain cell types enhancers epigenetics ex vivo brain slice genetic tools human macaque parvalbumin

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Last Updated: Nov 10, 2025

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Published on: August 18, 2014

Induction of Protein Deletion Through In Utero Electroporation to Define Deficits in Neuronal Migration in Transgenic Models

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Inducing Cre-lox Recombination in Mouse Cerebral Cortex Through In Utero Electroporation

Published on: November 17, 2017

Area of Science:

Neuroscience
Molecular Biology
Genetics

Background:

Targeting specific brain cell types is crucial for neuroscience research and gene therapy.
Developing viral vectors with cell-type specificity remains a challenge.

Purpose of the Study:

To identify and validate human neocortical subclass-specific enhancers for use in adeno-associated virus (AAV) vectors.
To create a new generation of non-species-restricted viral genetic tools for precise gene expression in the brain.

Main Methods:

Comparative open chromatin analysis to identify putative enhancers.
Systemic delivery of enhancer-AAVs in mice followed by molecular profiling for cellular specificity.
Validation of selected enhancer-AAVs in primate neocortex.

Main Results:

Thousands of human neocortical subclass-specific enhancers were identified.
Over 30% of tested enhancer-AAVs demonstrated specific expression in targeted neuronal subclasses (excitatory and inhibitory).
Developed Parvalbumin (PVALB) enhancer-AAVs showed enriched expression in cortical and subcortical PVALB populations, with five vectors maintaining specificity in primates.

Conclusions:

Genome-wide open chromatin data mining is effective for discovering cell-type-specific regulatory elements.
Cross-species validation of AAV vectors enables the development of broadly applicable genetic tools.
This work provides a powerful toolkit for advancing neuroscience and gene therapy applications.