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Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
Published on: December 11, 2009
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NOMA-GAP/ARHGAP33 regulates synapse development and autistic-like behavior in the mouse
S Schuster1, M Rivalan2, U Strauss3
1Dendritic Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
Molecular Psychiatry
|April 15, 2015
Summary
NOMA-GAP protein deficiency in mice impairs social behaviors and synapse development, characteristic of autism spectrum disorders (ASDs). Its interaction with MAGUK proteins, particularly PSD-95, is crucial for synaptic function and social behavior regulation.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Neuropsychiatric disorders like autism spectrum disorders (ASDs) and schizophrenia involve social behavior deficits.
- These disorders are often linked to abnormal development of dendritic spines and synapses.
Purpose of the Study:
- To investigate the role of NOMA-GAP, a Cdc42 GTPase-activating protein, in regulating social behavior and synaptic development.
- To elucidate the molecular mechanisms underlying NOMA-GAP's function in the context of autism-like behaviors.
Main Methods:
- Utilized genetically engineered mice lacking NOMA-GAP.
- Performed experiments involving Cre-mediated deletion of Cdc42.
- Analyzed spine morphology, social behavior, protein interactions (MAGUK proteins), PSD-95 phosphorylation and localization, and AMPA receptor levels.
Main Results:
- NOMA-GAP deficiency in mice resulted in autism-like social behaviors and impaired dendritic spine and synapse development.
- Deleting Cdc42 alone did not restore spine morphology or social behavior in NOMA-GAP-deficient mice.
- NOMA-GAP interacts with MAGUK proteins, modulating its activity and regulating PSD-95 phosphorylation and localization, leading to reduced surface AMPA receptors and defective synaptic transmission.
Conclusions:
- NOMA-GAP is a key regulator of social behavior and synaptic development, potentially contributing to autism spectrum disorders.
- NOMA-GAP's function extends beyond Cdc42 regulation, involving interactions with MAGUK proteins like PSD-95.
- Dysregulation of the NOMA-GAP/PSD-95 pathway impacts synaptic plasticity and underlies autism-like social deficits.
