DRD3 — Dopamine Receptor D3

DRD3 — Dopamine Receptor D3

Introduction

Drd3 — Dopamine Receptor D3 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

Dopamine Receptor D3 is a The D3 dopamine receptor is a D2-like receptor that plays crucial roles in motor control, reward processing, and cognitive functions. It is predominantly expressed in the limbic system and is a major target for antipsychotic drugs and [Parkinson's disease](/diseases/parkinsons-disease) therapeutics.

Gene Information

DRD3 — Dopamine Receptor D3

Introduction

Drd3 — Dopamine Receptor D3 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

Dopamine Receptor D3 is a The D3 dopamine receptor is a D2-like receptor that plays crucial roles in motor control, reward processing, and cognitive functions. It is predominantly expressed in the limbic system and is a major target for antipsychotic drugs and [Parkinson's disease](/diseases/parkinsons-disease) therapeutics.

Gene Information

<div class="infobox infix-gene">
<table>
<tr><th>Symbol</th><td>DR3</td></tr>
<tr><th>Full Name</th><td>Dopamine Receptor D3</td></tr>
<tr><th>Chromosomal Location</th><td>3q13.3</td></tr>
<tr><th>NCBI Gene ID</th><td>[1818](https://www.ncbi.nlm.nih.gov/gene/1818)</td></tr>
<tr><th>OMIM</th><td>[139251](https://www.omim.org/entry/139251)</td></tr>
<tr><th>Ensembl ID</th><td>[ENSG00000151577](https://www.ensembl.org/Human/Gene/Summary?g=ENSG00000151577)</td></tr>
<tr><th>UniProt</th><td>[P35462](https://www.uniprot.org/uniprot/P35462)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/hepatitis" style="color:#ef9a9a">Hepatitis</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">23 edges</a></td>
</tr>
</table>
</div>

Function

The DR3 gene encodes a G protein-coupled receptor that The D3 dopamine receptor is a D2-like receptor that plays crucial roles in motor control, reward processing, and cognitive functions. It is predominantly expressed in the limbic system and is a major target for antipsychotic drugs and Parkinson's disease therapeutics.

Signal Transduction

This receptor couples to G proteins to activate downstream signaling cascades:

• Gα signaling: Coupling to Gα subunits leads to modulation of adenylyl cyclase and phospholipase C
• Kinase pathways: Activation of MAPK, PI3K/Akt, and PLC pathways
• Ion channels: Modulation of calcium and potassium channel activity

Disease Associations

| Disease | Role | Evidence |
|---------|------|----------|
| Parkinson's disease | Receptor alterations affect dopaminergic signaling | GWAS, postmortem studies |
| Schizophrenia | Altered receptor expression and signaling | Genetic association, PET studies |
| Movement disorders | Receptor polymorphisms affect motor control | Clinical studies |

Expression Pattern

This receptor is expressed in various brain regions:

• Striatum: Moderate to high expression
• [Hippocampus](/brain-regions/hippocampus): Regional expression
• [Cortex](/brain-regions/cortex): Layer-specific distribution
• Substantia nigra: Pars compacta region

Therapeutic Implications

Drug Targets

• Agonists: Therapeutic potential for pain and movement disorders
• Antagonists: Antipsychotic development, addiction treatment

Clinical Considerations

• Receptor occupancy studies using PET ligands
• Side effect profile related to receptor subtype selectivity

Key Publications

See Also

• [Parkinson's Disease](/diseases/parkinsons-disease) - Dopamine receptor changes in PD
• [Schizophrenia](/diseases/schizophrenia) - Receptor alterations in psychiatric disorders
• [Dopamine Signaling](/mechanisms/dopamine-signaling) - Signaling pathways
• [Dopamine Receptors](/entities/dopamine-receptors) - Receptor family
• [Antipsychotics](/therapeutics/antipsychotics) - Drug class targeting these receptors
• [GPCR](/entities/g-protein-coupled-receptors) - Receptor superfamily

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/1818)
• [UniProt](https://www.uniprot.org/uniprot/P35462)
• [Ensembl](https://www.ensembl.org/Human/Gene/Summary?g=ENSG00000151577)
• [Human Protein Atlas](https://www.proteinatlas.org/search/dr3)
• [IUPHAR/BPS Guide to Pharmacology](https://www.guidetopharmacology.org/GRAC/ObjectDetailsForward?name=DR3&objectClass=receptor)

Background

The study of Drd3 — Dopamine Receptor D3 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.

References

Pathway Diagram

The following diagram shows the key molecular relationships involving DRD3 — Dopamine Receptor D3 discovered through SciDEX knowledge graph analysis: