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Related Experiment Video

Updated: Nov 16, 2025

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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Neurexin1⍺ differentially regulates synaptic efficacy within striatal circuits.

M Felicia Davatolhagh1, Marc V Fuccillo2

  • 1Neuroscience Graduate Group, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Cell Reports
|February 24, 2021
PubMed
Summary

Neurexin1α (Nrxn1α) mutations impair synaptic function in the striatum, affecting cognitive and motor control pathways relevant to neuropsychiatric disorders. This study reveals input-specific effects on striatal circuits in Nrxn1α-deficient mice.

Keywords:
Neurexin1αcorticostriatalendocannabinoidoptogeneticsprefrontal cortexrelease probabilityspiny projection neuronstriatumsynaptic strengthsynaptic transmissionthalamostriatal

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Synaptic dysfunction in genes like Neurexin1α (Nrxn1α) is linked to neuropsychiatric disorders.
  • The striatum, crucial for motor and cognitive functions, integrates signals from various brain regions.
  • Impaired striatal function is a common feature in neurological and psychiatric conditions.

Purpose of the Study:

  • To investigate the functional role of Neurexin1α (Nrxn1α) in striatal circuits.
  • To determine how Nrxn1α deficiency affects synaptic transmission from the dorsal prefrontal cortex (dPFC) and thalamus to the dorsomedial striatum (DMS).

Main Methods:

  • Optogenetic-mediated afferent recruitment was used to activate dPFC and thalamic inputs to DMS.
  • Electrophysiological recordings were performed on spiny projection neurons (SPNs) in Nrxn1α mutant mice.
  • Changes in synaptic strength and neurotransmitter release were analyzed.

Main Results:

  • Nrxn1α deficiency led to decreased synaptic strength in dPFC-DMS circuits, specifically on indirect pathway SPNs.
  • This reduction was attributed to diminished neurotransmitter release.
  • Thalamic inputs to DMS showed largely preserved excitatory synaptic strength, despite alterations in N-methyl-D-aspartate receptor (NMDAR) content.

Conclusions:

  • Dysregulation of Neurexin1α (Nrxn1α) impacts striatal function in a manner dependent on the specific input pathway and target neuron.
  • These findings highlight the critical role of Nrxn1α in modulating synaptic plasticity within the basal ganglia.
  • The input-specific effects suggest distinct mechanisms underlying Nrxn1α's contribution to neuropsychiatric pathophysiology.