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Updated: Dec 14, 2025

Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders

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Published on: May 12, 2015

Modular, Circuit-Based Interventions Rescue Hippocampal-Dependent Social and Spatial Memory in a 22q11.2 Deletion

Julia B Kahn¹, Russell G Port², Stewart A Anderson²

¹Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

Biological Psychiatry

|July 20, 2020

Summary

Managing neuronal circuit hyperexcitability in 22q11.2 deletion syndrome (22qDS) can rescue memory deficits. Targeted chemogenetic inhibition in specific brain regions improved social and spatial memory in mouse models.

Keywords:

22q11.2 deletion syndrome Chemogenetics Circuit-based therapies Hippocampus Social memory Spatial memory

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Published on: March 22, 2016

Area of Science:

Neuroscience
Genetics
Pharmacology

Background:

22q11.2 deletion syndrome (22qDS) presents diverse neuropsychiatric symptoms.
Polygenic haploinsufficiency in 22qDS complicates traditional treatments.
Aberrant neuronal circuit activity is a common mechanistic consequence in 22qDS.

Purpose of the Study:

To investigate if managing aberrant neuronal circuit activity in adult 22qDS model mice is a viable therapeutic strategy.
To assess the potential of targeting circuit excitability for treatment-resistant symptoms.

Main Methods:

Functional imaging in acute brain slices to analyze hippocampal circuit function.
Focal introduction of chemogenetic constructs in 22qDS model mice using adeno-associated viral vectors.
Targeting specific CA1 subcircuits (ventral for social, dorsal for spatial memory) to manipulate circuit recruitment.

Main Results:

22qDS model mice displayed CA1 excitatory hyperexcitability and deficits in social and spatial memory.
Chemogenetic inhibition of pyramidal cells successfully corrected memory deficits in a region-specific manner.
Manipulating circuit activity in control mice replicated memory deficits, confirming circuit specificity.

Conclusions:

Retuning dysregulated circuit activity can restore function in disease-altered circuits, even with polygenic developmental disorders.
Focal and modular targeting of circuit excitability offers a promising therapeutic approach for treatment-resistant mental illness symptoms.