CACNA2D1 Gene - Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1

CACNA2D1 Gene — Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA2D1 Gene - Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CACNA2D1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>CaB1, CACNA2, α2δ1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7q21.11</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>781</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>114204</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000153991</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q13926</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Calcium channel auxiliary subunit</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>High in brain, skeletal muscle, heart</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

CACNA2D1 Gene — Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA2D1 Gene - Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CACNA2D1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>CaB1, CACNA2, α2δ1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7q21.11</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>781</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>114204</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000153991</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q13926</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Calcium channel auxiliary subunit</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>High in brain, skeletal muscle, heart</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

CACNA2D1 encodes the alpha2 delta-1 subunit (CaB1) of voltage-gated calcium channels (VGCCs). This auxiliary subunit is a critical component of L-type and N-type calcium channels, modulating channel trafficking, gating, and synaptic localization. The alpha2 delta-1 subunit is expressed throughout the nervous system and skeletal muscle, where it plays essential roles in calcium influx, synaptic transmission, and excitation-contraction coupling.

The alpha2 delta-1 subunit derives from a single precursor protein that is post-translationally cleaved into alpha2 and delta peptides that remain connected by disulfide bonds. This complex associates with the pore-forming alpha1 subunit to modulate channel function["@perete2000"].

Structure and Function

Protein Structure

The alpha2 delta-1 precursor is 1256 amino acids that undergoes:

Role in Channel Function

The alpha2 delta-1 subunit modulates VGCCs by:

Channel Types

Alpha2 delta-1 associates with multiple channel types:

• Cav1.1 (L-type): Excitation-contraction coupling
• Cav1.2 (L-type): Neuronal L-type channels
• Cav2.1 (P/Q-type): Synaptic transmission
• Cav2.2 (N-type): Presynaptic calcium influx

Role in Neurodegeneration

Alzheimer's Disease

Calcium dysregulation is a hallmark of AD[@dube2017]:

• Altered alpha2 delta-1 expression in AD brains
• Enhanced calcium influx through modified channels
• Contribution to synaptic calcium dysregulation
• Interaction with amyloid pathology

Parkinson's Disease

Calcium homeostasis is disrupted in PD[@yang2023]:

• Dysregulated calcium entry in dopaminergic neurons
• Altered channel expression in substantia nigra
• Potential therapeutic targeting
• Mitochondrial calcium handling

Amyotrophic Lateral Sclerosis

Calcium dysfunction contributes to motor neuron disease[@chen2021]:

• Altered calcium buffering capacity
• Channel dysfunction in motor neurons
• Excitotoxicity mechanisms
• Therapeutic targeting potential

Epilepsy and Migraine

CACNA2D1 variants are associated with:

• Developmental and epileptic encephalopathies
• Familial epilepsy
• Familial hemiplegic migraine
• Ataxia

Therapeutic Implications

The alpha2 delta-1 subunit is a validated drug target:

Key Publications

Cross-Links

• [CACNA1A Gene](/genes/cacna1a) — L-type channel
• [CACNA1B Gene](/genes/cacna1b) — N-type channel
• [Calcium Channels](/proteins/calcium-channels)
• [Synaptic Transmission](/mechanisms/synaptic-transmission)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

See Also

• [Voltage-Gated Ion Channels](/proteins/voltage-gated-ion-channels)
• [Excitotoxicity](/mechanisms/excitotoxicity)
• [Synaptic Calcium Signaling](/mechanisms/synaptic-calcium-signaling)

Molecular Mechanisms in Neurodegeneration

Calcium Dysregulation in AD

Multiple studies have identified specific alterations in calcium channel subunits in Alzheimer's disease:

Amyloid-beta effects: Aβ oligomers directly interact with voltage-gated calcium channels, enhancing calcium influx. The alpha2 delta-1 subunit appears to mediate this interaction, as gabapentin treatment reduces Aβ-induced calcium dysregulation in cellular models.

Tau pathology interactions: Hyperphosphorylated tau disrupts calcium homeostasis through multiple mechanisms, including altered channel expression and disrupted signaling cascades. CACNA2D1 expression is reduced in tauopathy models, contributing to compensatory changes in calcium signaling.

Synaptic calcium dysregulation: Early in AD, synaptic calcium handling becomes abnormal before measurable cognitive decline. The alpha2 delta-1 subunit plays a critical role in presynaptic calcium entry, and its dysregulation contributes to synaptic failure.

Dopaminergic Neuron Vulnerability in PD

Dopaminergic neurons in the substantia pars compacta (SNc) exhibit unique calcium channel expression:

Pacemaker activity: These neurons exhibit autonomous pacemaking that relies on L-type calcium channels. The alpha2 delta-1 subunit modulates this activity, and altered expression may contribute to calcium dysregulation.

Mitochondrial interactions: Calcium handling and mitochondrial function are intimately linked. Dysregulated calcium influx through modified channels can trigger mitochondrial dysfunction and subsequent dopaminergic neuron death.

Alpha-synuclein interactions: Recent studies suggest alpha-synuclein pathology affects calcium channel function. CACNA2D1 variants may modify susceptibility to these effects.

Therapeutic Approaches

Gabapentinoid Therapy

Gabapentin and pregabalin bind to the alpha2 delta-1 subunit:

• Mechanism: Bind to the α2δ subunit, reducing calcium influx
• Clinical use: Approved for epilepsy and neuropathic pain
• Potential in neurodegeneration: Being explored for AD and PD
• Limitations:CNS penetration, dosing, side effects

Novel Drug Development

Several approaches target calcium channels more specifically:

Gene Therapy Strategies

• AAV-mediated delivery: Express modified alpha2 delta-1
• CRISPR approaches: Correct disease-associated variants
• RNA-based therapies: Modulate expression

Additional Research Directions

Biomarker Development

Calcium channel function may serve as a biomarker:

• CSF calcium channel antibodies: Potential disease markers
• Functional assessments: Calcium imaging in neurons derived from patient iPSCs
• Expression studies: CACNA2D1 mRNA levels in blood

Network Effects

Calcium dysregulation affects broader neuronal networks:

• Network oscillations: Altered calcium affects gamma oscillations
• Circuit dysfunction: Contributes to network hypersynchrony
• Therapeutic implications: Network-level interventions

Aging and Calcium Homeostasis

Age-related changes in calcium handling:

• Declining calcium buffering capacity
• Altered channel expression with age
• Accumulation of calcium dysregulation
• Interaction with neurodegeneration

Additional References

Pathway Diagram

The following diagram shows the key molecular relationships involving CACNA2D1 Gene - Calcium Channel Voltage-Dependent Subunit Alpha2 Delta 1 discovered through SciDEX knowledge graph analysis: