Dopamine Receptor D1 (DRD1)

DRD1 — Dopamine Receptor D1

<div class="infobox infobox-protein">
<h3>DRD1 Protein</h3>
<table>
<tr><th>Protein Name</th><td>Dopamine Receptor D1</td></tr>
<tr><th>Gene</th><td>[DRD1](/genes/drd1)</td></tr>
<tr><th>UniProt ID</th><td>[P21728](https://www.uniprot.org/uniprot/P21728)</td></tr>
<tr><th>Molecular Weight</th><td>49 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Plasma Membrane, [Dendritic Spines](/cell-types/dendritic-spines)</td></tr>
<tr><th>Protein Family</th><td>D1-like dopamine receptor family</td></tr>
<tr><th>Gene Location</th><td>5q35.2</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/bipolar" style="color:#ef9a9a">Bipolar</a>, <a href="/wiki/depression" style="color:#ef9a9a">Depression</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">132 edges</a></td>
</tr>
</table>
</div>

Overview

DRD1 — Dopamine Receptor D1

<div class="infobox infobox-protein">
<h3>DRD1 Protein</h3>
<table>
<tr><th>Protein Name</th><td>Dopamine Receptor D1</td></tr>
<tr><th>Gene</th><td>[DRD1](/genes/drd1)</td></tr>
<tr><th>UniProt ID</th><td>[P21728](https://www.uniprot.org/uniprot/P21728)</td></tr>
<tr><th>Molecular Weight</th><td>49 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Plasma Membrane, [Dendritic Spines](/cell-types/dendritic-spines)</td></tr>
<tr><th>Protein Family</th><td>D1-like dopamine receptor family</td></tr>
<tr><th>Gene Location</th><td>5q35.2</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/bipolar" style="color:#ef9a9a">Bipolar</a>, <a href="/wiki/depression" style="color:#ef9a9a">Depression</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">132 edges</a></td>
</tr>
</table>
</div>

Overview

DRD1 (Dopamine Receptor D1) is the prototypical D1-like dopamine receptor and a critical mediator of dopaminergic signaling in the brain[@dopamine2018][@dopamine2020]. It is a G protein-coupled receptor (GPCR) that activates adenylate cyclase, increasing intracellular cAMP levels upon dopamine binding. DRD1 is highly expressed in the striatum, prefrontal [cortex](/brain-regions/cortex), and other brain regions involved in motor control, reward, and cognition[@drd2021]. Dysregulation of DRD1 signaling is implicated in Parkinson's disease, schizophrenia, and other neurological disorders.

Structure

DRD1 has characteristic GPCR features:

• Seven transmembrane domains: Form the ligand-binding pocket
• Extracellular N-terminus: Contains glycosylation sites
• Intracellular C-terminus: Contains phosphorylation sites
• Third intracellular loop: Couples to G proteins
• Dimerization interface: Can form functional dimers

Normal Function

Signal Transduction

DRD1 activates downstream signaling pathways:

• Gαs/olf coupling: Stimulates adenylate cyclase
• cAMP production: Increases intracellular cAMP
• PKA activation: Activates protein kinase A
• DARPP-32 phosphorylation: Modulates striatal signaling
• CREB activation: Regulates gene transcription

Brain Functions

DRD1 mediates diverse dopaminergic functions:

• Motor control: Facilitates movement initiation
• Reward processing: Encodes reward prediction errors
• Working memory: Modulates prefrontal cortical function
• Attention: Regulates attentional processes
• Motivation: Drives reward-motivated behavior

Synaptic Regulation

DRD1 modulates synaptic function:

• Excitatory transmission: Enhances glutamatergic signaling
• Inhibitory transmission: Modulates GABAergic signaling
• [Long-term potentiation](/mechanisms/long-term-potentiation): Promotes [LTP](/mechanisms/long-term-potentiation) in striatum and cortex
• Synaptic plasticity: Regulates experience-dependent changes

Role in Neurodegenerative Diseases

Parkinson's Disease (PD)

DRD1 is central to PD and its treatment[@drd2022]:

Alzheimer's Disease (AD)

DRD1 signaling affects AD pathogenesis:

Other Neurological Conditions

• Schizophrenia: DRD1-linked to positive symptoms
• Addiction: DRD1 mediates reward-related learning
• Huntington's disease: Altered DRD1 signaling
• ADHD: DRD1 polymorphisms associated with susceptibility

Therapeutic Implications

DRD1 is a major therapeutic target:

• Parkinson's treatment: Agonists (pramipexole, ropinirole)
• Antipsychotics: D1 antagonists for schizophrenia
• Cognitive enhancement: D1 agonists for cognitive deficits
• Addiction treatment: D1 modulation for substance abuse

Cross-links

• [DRD1 Gene](/proteins/drd1-protein)
• [Dopamine Receptors](/proteins/dopamine-receptors)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Dopamine Signaling](/mechanisms/dopamine-signaling)
• [Basal Ganglia](/brain-regions/basal-ganglia)

See Also

• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Dopamine Signaling](/mechanisms/dopamine-signaling)

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/)
• [KEGG Pathways](https://www.genome.jp/kegg/pathway.html)

References