University of Massachusetts Medical School Faculty Publications

UMMS Affiliation

Department of Neurobiology; Brudnick Neuropsychiatric Research Institute; Futai Lab; Graduate School of Biomedical Sciences

Publication Date

2021-10-06

Document Type

Article

Disciplines

Amino Acids, Peptides, and Proteins | Molecular and Cellular Neuroscience | Nervous System Diseases

Abstract

Chemical synapses provide a vital foundation for neuron-neuron communication and overall brain function. By tethering closely apposed molecular machinery for presynaptic neurotransmitter release and postsynaptic signal transduction, circuit- and context- specific synaptic properties can drive neuronal computations for animal behavior. Trans-synaptic signaling via synaptic cell adhesion molecules (CAMs) serves as a promising mechanism to generate the molecular diversity of chemical synapses. Neuroligins (Nlgns) were discovered as postsynaptic CAMs that can bind to presynaptic CAMs like Neurexins (Nrxns) at the synaptic cleft. Among the four (Nlgn1-4) or five (Nlgn1-3, Nlgn4X, and Nlgn4Y) isoforms in rodents or humans, respectively, Nlgn3 has a heterogeneous expression and function at particular subsets of chemical synapses and strong association with non-syndromic autism spectrum disorder (ASD). Several lines of evidence have suggested that the unique expression and function of Nlgn3 protein underlie circuit-specific dysfunction characteristic of non-syndromic ASD caused by the disruption of Nlgn3 gene. Furthermore, recent studies have uncovered the molecular mechanism underlying input cell-dependent expression of Nlgn3 protein at hippocampal inhibitory synapses, in which trans-synaptic signaling of specific alternatively spliced isoforms of Nlgn3 and Nrxn plays a critical role. In this review article, we overview the molecular, anatomical, and physiological knowledge about Nlgn3, focusing on the circuit-specific function of mammalian Nlgn3 and its underlying molecular mechanism. This will provide not only new insight into specific Nlgn3-mediated trans-synaptic interactions as molecular codes for synapse specification but also a better understanding of the pathophysiological basis for non-syndromic ASD associated with functional impairment in Nlgn3 gene.

Keywords

autism (ASD), cell adhension molecules, development, excitatory synaptic activity, excitatory/inhibitory balance, inhibitory synaptic connection, neuroligin 3 mutation, trans-synaptic adhesion molecule

Rights and Permissions

Copyright © 2021 Uchigashima, Cheung and Futai. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

DOI of Published Version

10.3389/fnmol.2021.749164

Source

Uchigashima M, Cheung A, Futai K. Neuroligin-3: A Circuit-Specific Synapse Organizer That Shapes Normal Function and Autism Spectrum Disorder-Associated Dysfunction. Front Mol Neurosci. 2021 Oct 6;14:749164. doi: 10.3389/fnmol.2021.749164. PMID: 34690695; PMCID: PMC8526735. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Frontiers in molecular neuroscience

PubMed ID

34690695

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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