ADRA2A Gene

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ADRA2A Gene

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ADRA2A Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ADRA2A Gene</th>
</tr>
<tr>
<td class="label">Drug</td>
<td>Use</td>
</tr>
<tr>
<td class="label">Clonidine</td>
<td>Hypertension, ADHD</td>
</tr>
<tr>
<td class="label">Guanfacine</td>
<td>Hypertension, ADHD</td>
</tr>
<tr>
<td class="label">Dexmedetomidine</td>
<td>Sedation</td>
</tr>
<tr>
<td class="label">Brimonidine</td>
<td>Glaucoma</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Use</td>
</tr>
<tr>
<td class="label">Yohimbine</td>
<td>Reversal of α2 blockade</td>
</tr>
<tr>
<td class="label">Atipamezole</td>
<td>Veterinary reversal</td>
</tr>
<tr>
<td class="label">Idazoxan</td>
<td>Research tool</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/dementia" style="color:#ef9a9a">Dementia</a>, <a href="/wiki/depression" style="color:#ef9a9a">Depression</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-4113b0e8" style="color:#ce93d8" title="Score: 0.47">Noradrenergic-Tau Propagation Blockade...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">94 edges</a></td>
</tr>
</table>

...

ADRA2A Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ADRA2A Gene</th>
</tr>
<tr>
<td class="label">Drug</td>
<td>Use</td>
</tr>
<tr>
<td class="label">Clonidine</td>
<td>Hypertension, ADHD</td>
</tr>
<tr>
<td class="label">Guanfacine</td>
<td>Hypertension, ADHD</td>
</tr>
<tr>
<td class="label">Dexmedetomidine</td>
<td>Sedation</td>
</tr>
<tr>
<td class="label">Brimonidine</td>
<td>Glaucoma</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Use</td>
</tr>
<tr>
<td class="label">Yohimbine</td>
<td>Reversal of α2 blockade</td>
</tr>
<tr>
<td class="label">Atipamezole</td>
<td>Veterinary reversal</td>
</tr>
<tr>
<td class="label">Idazoxan</td>
<td>Research tool</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/dementia" style="color:#ef9a9a">Dementia</a>, <a href="/wiki/depression" style="color:#ef9a9a">Depression</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-4113b0e8" style="color:#ce93d8" title="Score: 0.47">Noradrenergic-Tau Propagation Blockade...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">94 edges</a></td>
</tr>
</table>

Adra2A 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

Mermaid diagram (expand to render)

The ADRA2A gene encodes the alpha-2A adrenergic receptor (alpha2A-AR), a G protein-coupled receptor that mediates the sympathetic nervous system's response to catecholamines. This receptor plays crucial roles in regulating blood pressure, heart rate, neurotransmitter release, and various autonomic functions. alpha2A-AR is a key therapeutic target for hypertension, ADHD, and analgesic medications.

Function

Normal Function

The α2A-adrenergic receptor has multiple physiological roles:

Blood Pressure Regulation: Central sympathetic inhibition reduces vascular tone
Norepinephrine Feedback: Autoreceptor function limits neurotransmitter release
Pain Modulation: Spinal α2A-AR inhibits pain signal transmission
Platelet Aggregation: Alpha-2A activation inhibits platelet activation
Insulin Secretion: Modulates pancreatic beta-cell function
Thermoregulation: Influences brown adipose tissue thermogenesis

Signaling Mechanisms

G-Protein Coupling: Gi/o proteins inhibit adenylate cyclase
cAMP Reduction: Decreased intracellular cAMP levels
Ion Channel Modulation: Activation of inwardly rectifying K+ channels
MAPK Pathways: Can activate ERK1/2 signaling

Expression Pattern

Central Nervous System: Locus coeruleus, spinal cord dorsal horn, prefrontal [cortex](/brain-regions/cortex)
Peripheral Tissues: Platelets, adipocytes, pancreatic islets
Blood Vessels: Vascular smooth muscle cells

Disease Associations

Parkinson's Disease

Dopamine Interaction: α2A-AR modulates dopaminergic transmission
Levodopa-Induced Dyskinesia: α2A-AR antagonists may reduce LID
Blood Pressure Dysregulation: Autonomic dysfunction in PD

Alzheimer's Disease

Norepinephrine Signaling: Memory and attention modulation
Neuroinflammation: α2A-AR regulates microglial activation
Therapeutic Targeting: α2A-agonists show cognitive effects

Attention Deficit Hyperactivity Disorder (ADHD)

Atomoxetine Target: Norepinephrine reuptake inhibition affects α2A signaling
Prefrontal Function: Working memory and attention regulation
Genetic Variants: ADRA2A polymorphisms associated with ADHD

Hypertension

Central Action: Clonidine and guanfacine lower blood pressure
Peripheral Vasodilation: Reduced sympathetic tone
Reflex Tachycardia: Baroreflex modulation

Chronic Pain

Spinal Analgesia: α2A-AR agonists (clonidine) used as adjuvants
Neuropathic Pain: Efficacy in diabetic neuropathy and cancer pain
Opioid Sparing: Reduces opioid requirements

Molecular Mechanisms

Receptor Structure

Seven Transmembrane Domains: Classic GPCR architecture
N-Terminal Extracellular Domain: Ligand binding
C-Terminal Intracellular Domain: G-protein coupling and phosphorylation
Disulfide Bond: Conserved cysteine bridge stabilization

Polymorphisms

rs5538 (3' UTR): Associated with ADHD and hypertension
rs1800544: Linked to drug response
rs521491: Influences receptor expression

Therapeutic Targeting

Agonists

Antagonists

Animal Models

Knockout Studies

ADRA2A knockout mice show elevated norepinephrine and blood pressure
Phenotypes include increased heart rate and activity
Helpful for understanding receptor function

Transgenic Models

Overexpression models study receptor function
Humanized mice for drug testing

External Links

[NCBI Gene: ADRA2A](https://www.ncbi.nlm.nih.gov/gene/150)
[UniProt: P08913](https://www.uniprot.org/uniprot/P08913)
[IUPHAR/BPS Guide: α2A-AR](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=79)
[OMIM: 104210](https://www.omim.org/entry/104210)

Background

The study of Adra2A 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.

References

[Kobilka BK, et al, (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/17285757/)

[Limbird LE, et al, (2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/16306745/)

[MacDonald E, et al, (1997) (1997)](https://pubmed.ncbi.nlm.nih.gov/9364032/)

[Brede M, et al, (2003) (2003)](https://pubmed.ncbi.nlm.nih.gov/12623996/)

[Arnsten AF, et al, (2009) (2009)](https://pubmed.ncbi.nlm.nih.gov/19230657/)

[Gavras I, et al, (2004) (2004)](https://pubmed.ncbi.nlm.nih.gov/15545673/)

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Noradrenergic-Tau Propagation Blockade](/hypothesis/h-4113b0e8) — <span style="color:#ffd54f;font-weight:600">0.47</span> · Target: ADRA2A

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adra2a

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kg_node_id	adra2a
entity_type	gene
origin_type	v1_polymorphic_backfill
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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

100%

Debates

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Incoming

109

Outgoing

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0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ADRA2A Gene

ADRA2A Gene

Introduction

ADRA2A Gene

Introduction

Overview

Function

Normal Function

Signaling Mechanisms

Expression Pattern

Disease Associations

Parkinson's Disease

Alzheimer's Disease

Attention Deficit Hyperactivity Disorder (ADHD)

Hypertension

Chronic Pain

Molecular Mechanisms

Receptor Structure

Polymorphisms

Therapeutic Targeting

Agonists

Antagonists

Animal Models

Knockout Studies

Transgenic Models

See Also

External Links

Background

References

💬 Discussion

📗 Cite This Artifact

ADRA2A Gene

ADRA2A Gene

Introduction

ADRA2A Gene

Introduction

Overview

Function

Normal Function

Signaling Mechanisms

Expression Pattern

Disease Associations

Parkinson's Disease

Alzheimer's Disease

Attention Deficit Hyperactivity Disorder (ADHD)

Hypertension

Chronic Pain

Molecular Mechanisms

Receptor Structure

Polymorphisms

Therapeutic Targeting

Agonists

Antagonists

Animal Models

Knockout Studies

Transgenic Models

See Also

External Links

Background

References

Related Hypotheses

💬 Discussion