DLG3 Gene

DLG3 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">DLG3 Gene</th>
</tr>
<tr>
<td class="label">Attribute</td>
<td>Value</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DLG3</td>
</tr>
<tr>
<td class="label">Gene Name</td>
<td>Discs Large Homolog 3 (SAP-102)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>Xq13.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[1741](https://www.ncbi.nlm.nih.gov/gene/1741)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000165682](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000165682)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9UQB5](https://www.uniprot.org/uniprot/Q9UQB5)</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Dlg3 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

DLG3 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">DLG3 Gene</th>
</tr>
<tr>
<td class="label">Attribute</td>
<td>Value</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DLG3</td>
</tr>
<tr>
<td class="label">Gene Name</td>
<td>Discs Large Homolog 3 (SAP-102)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>Xq13.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[1741](https://www.ncbi.nlm.nih.gov/gene/1741)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000165682](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000165682)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9UQB5](https://www.uniprot.org/uniprot/Q9UQB5)</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Dlg3 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

DLG3 (Discs Large Homolog 3), also known as SAP-102 (Synapse-Associated Protein 102), is a postsynaptic scaffold protein essential for synaptic organization and function. As a member of the membrane-associated guanylate kinase (MAGUK) family, DLG3 plays critical roles in anchoring neurotransmitter receptors, organizing signaling complexes, and maintaining synaptic plasticity. It is particularly important during brain development and in cognitive function.

Molecular Function

DLG3 functions as a key postsynaptic scaffold protein:

Protein-Protein Interactions

• PDZ domains: Bind to [NMDA](/entities/nmda-receptor) receptor subunits (GluN2A, GluN2B), Kv1.x potassium channels
• SH3 domain: Interacts with proline-rich proteins
• GK domain: Associates with GKAP proteins, linking to larger scaffold complexes

Synaptic Targeting

• NMDA receptors to postsynaptic sites
• AMPA receptors (indirectly through PSD-95 interactions)
• Potassium channels
• Signaling enzymes (nNOS, PI3K)

Developmental Expression

• Peak expression in early postnatal period
• Gradually replaced by PSD-95 in adults
• Maintained in certain brain regions throughout life

Disease Associations

X-Linked Intellectual Disability

DLG3 is a cause of X-linked intellectual disability^[1]. Mutations cause:

• Moderate to severe intellectual disability
• Developmental delay
• Speech impairment
• Behavioral problems (autism-like features)
• Sometimes seizures

Schizophrenia

DLG3 variants have been associated with schizophrenia risk^[2]. The protein's role in NMDA receptor function links it to the glutamate hypothesis of schizophrenia.

Alzheimer's Disease

DLG3 expression is altered in AD brains^[3]:

• Affects NMDA receptor signaling
• Contributes to synaptic dysfunction
• May influence [tau](/proteins/tau) pathology

Autism Spectrum Disorder

Rare DLG3 variants have been identified in autism patients, suggesting a role in social behavior and communication.

Expression Pattern

DLG3 shows highest expression in:

• Developing brain (postnatal days 1-21)
• [Hippocampus](/brain-regions/hippocampus) (CA1-CA3, dentate gyrus)
• Cerebral [cortex](/brain-regions/cortex) (layers II-VI)
• [Striatum](/brain-regions/striatum)
• [Thalamus](/brain-regions/thalamus)

• Hippocampal [neurons](/entities/neurons)
• Cortical layer 2/3 neurons
• Certain thalamic nuclei

Therapeutic Implications

Target for Intellectual Disability

• Gene therapy approaches to restore DLG3 function
• Small molecules that enhance DLG2/DLG3 compensation
• Modulators of downstream signaling

Cognitive Enhancement

• Treatments for intellectual disability
• Cognitive enhancers for aging
• Strategies to improve learning and memory

Key Publications

See Also

• [DLG3 Protein](/proteins/dlg3-protein)
• [DLG2 Gene](/proteins/dlg2-protein)
• [DLG4 Gene](/proteins/dlg4-protein)
• [PSD-95 Protein](/proteins/psd95-protein)
• [Intellectual Disability](/diseases/intellectual-disability)
• [Schizophrenia](/diseases/schizophrenia)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Synaptic Scaffolding](/mechanisms/synaptic-dysfunction-pathway)
• [NMDA Receptors](/entities/nmda-receptors)

Background

The study of Dlg3 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References