<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA2D3 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CACNA2D3</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>CACNA2D3</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=CACNA2D3" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">14 edges</a></td>
</tr>
</table>
CACNA2D3 encodes calcium channel auxiliary subunit alpha2delta-3 (alpha2delta-3), part of the alpha2delta family that regulates trafficking, surface abundance, and gating behavior of high-voltage activated calcium channels.[@ncbi][@dolphin2012] In [neurons](/entities/neurons), alpha2delta subunits are critical determinants of presynaptic calcium entry and synaptic release fidelity, linking CACNA2D3 to circuit excitability and synaptic resilience.[@dolphin2012][@eroglu2009]
Within NeuroWiki’s mechanistic framework, CACNA2D3 maps to [calcium signaling dysregulation](/mechanisms/calcium-signaling-dysregulation), [synaptic dysfunction](/mechanisms/synaptic-dysfunction), and [ion channel dysfunction in neurodegeneration](/mechanisms/ion-channel-dysfunction-neurodegeneration). Although CACNA2D1 is the most pharmacologically characterized alpha2delta family member in pain medicine, CACNA2D3 has distinct CNS-enriched expression and emerging disease relevance for sensory processing, excitability disorders, and network-level vulnerability.[@dolphin2012][@neely2010]
CACNA2D3 resides on chromosome 3p21.1 and produces a precursor polypeptide that is post-translationally cleaved into alpha2 and delta components, which remain linked by disulfide bonds.[@ncbi][@dolphin2012] The mature complex is GPI-anchored and operates as an extracellular auxiliary module for Cav channel alpha1 pore-forming subunits.[@dolphin2012]
Core mechanistic properties:
Cav channel function sets neurotransmitter release probability. By modifying channel abundance and gating, CACNA2D3 influences synaptic gain and temporal precision in neuronal communication.[@dolphin2012][@eroglu2009]
Experimental data suggest alpha2delta-3 contributes to sensory and nociceptive processing, with conserved roles across species in heat/pain-related circuit responses.[@neely2010]
Because calcium influx is a central second messenger for plasticity and metabolic load, alpha2delta-3 can indirectly affect pathways relevant to neurodegenerative stress, including mitochondrial burden, proteostasis pressure, and inflammatory signaling.[@berridge2016][@surmeier2017]
Direct neurodegeneration-causative CACNA2D3 mutations are not yet established at the level of major monogenic AD/PD/ALS genes, but pathway logic and systems data support translational relevance.
Calcium dysregulation is a recurring mechanism in [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), and [Amyotrophic Lateral Sclerosis (ALS)](/diseases/amyotrophic-lateral-sclerosis).[@berridge2016][@surmeier2017] Proteins controlling calcium channel trafficking, including alpha2delta family members, can shape disease-sensitive thresholds for excitotoxic and metabolic injury.
Neurodegeneration often begins with synaptic dysfunction. CACNA2D3-mediated modulation of presynaptic calcium entry places it upstream of synaptic release failures and plasticity breakdown that precede overt cell death.[@eroglu2009][@berridge2016]
Activity-dependent calcium signaling contributes to neuron-glia crosstalk and inflammatory tone. Perturbations in channel-support proteins may therefore have secondary effects on inflammatory amplification loops in chronic neurodegeneration.[@berridge2016]
Population and sequencing studies have associated CACNA2D3 variation with epilepsy and neurodevelopmental phenotypes, highlighting its role in excitation-control biology relevant to broader circuit diseases.[@butler2016][@iossifov2014]
Rare-variant and copy-number studies have reported CACNA2D3 involvement in subsets of neurodevelopmental disorders, consistent with altered synaptic development/signaling.[@iossifov2014][@satterstrom2020]
Experimental models identified alpha2delta-3 as an evolutionarily conserved regulator of heat nociception and central pain pathway processing, reinforcing its importance in neuronal signal integration.[@neely2010]
Clinically used gabapentinoids primarily target alpha2delta-1/2 complexes; nevertheless, alpha2delta family pharmacology illustrates that auxiliary channel subunits are druggable nodes.[@fink2004] Understanding CACNA2D3-specific biology may enable more CNS-selective next-generation modulators.
Because calcium channels serve ubiquitous physiology, subtype selectivity and dose-window control are essential to avoid cognitive, psychiatric, sensory, or cardiovascular off-target effects.[@dolphin2012][@fink2004]
The following diagram shows the key molecular relationships involving CACNA2D3 Gene discovered through SciDEX knowledge graph analysis: