CACNA2D4 Gene

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CACNA2D4 Gene

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CACNA2D4 — Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA2D4 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CACNA2D4</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12p13.33</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[93589](https://www.ncbi.nlm.nih.gov/gene/93589)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[608898](https://omim.org/entry/608898)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000151092](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000151092)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q7Z3Y7](https://www.uniprot.org/uniprot/Q7Z3Y7)</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Voltage-gated calcium channel auxiliary subunit (alpha2delta family)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Retinitis pigmentosa, Cone-rod dystrophy, Autism spectrum disorder, Epilepsy, Cerebellar ataxia</td>
</tr>
</table>

Introduction

flowchart TD CACNA2D4["CACNA2D4"] -->|"contributes to"| Ms["Ms"] CACNA2D4["CACNA2D4"] -->|"inhibits"| CAV1["CAV1"] style CACNA2D4 fill:#4fc3f7,stroke:#333,color:#000

...

CACNA2D4 — Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA2D4 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CACNA2D4</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12p13.33</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[93589](https://www.ncbi.nlm.nih.gov/gene/93589)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[608898](https://omim.org/entry/608898)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000151092](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000151092)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q7Z3Y7](https://www.uniprot.org/uniprot/Q7Z3Y7)</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Voltage-gated calcium channel auxiliary subunit (alpha2delta family)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Retinitis pigmentosa, Cone-rod dystrophy, Autism spectrum disorder, Epilepsy, Cerebellar ataxia</td>
</tr>
</table>

Introduction

Mermaid diagram (expand to render)

The CACNA2D4 gene encodes the alpha2delta-4 subunit, a auxiliary component of voltage-gated calcium channels (VGCCs). This subunit belongs to the alpha2delta family of auxiliary subunits that modulate calcium channel trafficking, localization, and function. CACNA2D4 is predominantly expressed in retinal photoreceptors and certain neuronal populations, where it plays critical roles in calcium influx, phototransduction, synaptic transmission, and cellular homeostasis.

Mutations in CACNA2D4 cause autosomal recessive retinal degeneration, including retinitis pigmentosa (RP) and cone-rod dystrophy (CORD). These mutations lead to progressive photoreceptor cell death, resulting in visual field constriction, night blindness, and eventually complete blindness. Additionally, CACNA2D4 variants have been associated with autism spectrum disorder (ASD), epilepsy, and cerebellar ataxia, expanding its clinical relevance beyond the visual system.

The alpha2delta-4 subunit represents an important therapeutic target, with gabapentinoids (gabapentin, pregabalin) known to bind this subunit and modulate calcium channel function.

```{.infobox .infobox-gene}
```

Gene Structure and Protein

The human CACNA2D4 gene is located on chromosome 12p13.33 and spans approximately 25 kb, consisting of 38 exons that encode a 2024-amino acid protein. The protein undergoes extensive post-translational processing, including cleavage into alpha2 and delta fragments that remain associated through disulfide bonds.

Protein architecture:

Alpha2 fragment (residues 1-1470): Large extracellular domain containing multiple conserved domains
Delta fragment (residues 1471-2024): Single transmembrane helix with extracellular C-terminus
VWA domain: Von Willebrand domain A in the alpha2 region mediates protein-protein interactions
C-terminal tail: Intracellular region involved in trafficking and modulation

Key features:

Disulfide bonding: Alpha2 and delta subunits are linked by disulfide bonds
Glycosylation: Multiple N-linked glycosylation sites in the extracellular domain
Tissue-specific splicing: Alternative splicing generates tissue-specific isoforms
Localization: Primarily localized to the plasma membrane

Cellular Functions

Calcium Channel Modulation

The alpha2delta-4 subunit critically modulates L-type and Cav1.x voltage-gated calcium channels:

Trafficking enhancement: CACNA2D4 promotes the proper folding and trafficking of calcium channel alpha1 subunits to the plasma membrane

Channel localization: The subunit targets calcium channels to specific subcellular compartments, particularly photoreceptor synaptic terminals

Kinetic modulation: CACNA2D4 alters channel activation and inactivation kinetics

Current density: Loss of CACNA2D4 reduces calcium current amplitude in photoreceptors

Photoreceptor Function

In retinal photoreceptors, CACNA2D4 plays essential roles:

Synaptic calcium influx: Regulates calcium entry at photoreceptor synaptic terminals
Phototransduction termination: Calcium feedback modulates phototransduction cascade shutoff
Ribose homeostasis: Calcium regulates cyclic GMP turnover and channel activity
Photoreceptor survival: Proper calcium homeostasis is essential for photoreceptor viability

Synaptic Transmission

CACNA2D4 influences synaptic function beyond the retina:

Presynaptic function: Modulates neurotransmitter release at central synapses
Postsynaptic calcium: Affects dendritic calcium signaling in neurons
Synapse formation: Influences excitatory synapse development
Network activity: Contributes to neural circuit function

Expression Pattern

CACNA2D4 exhibits tissue-specific and cell-type-specific expression:

Retina:

Photoreceptors: Highest expression in rod and cone photoreceptor inner segments and synaptic terminals
Bipolar cells: Moderate expression in certain bipolar cell types
Ganglion cells: Low expression in some retinal ganglion cells

Brain:

Cerebellum: Expression in Purkinje cells and granule cells
Hippocampus: Expression in CA1 pyramidal neurons
Cortex: Expression in layer IV-V pyramidal neurons
Olfactory bulb: Expression in mitral and tufted cells

Other tissues:

Testis: Moderate expression
Heart: Low expression
Skeletal muscle: Very low expression

Disease Associations

Retinitis Pigmentosa (RP)

RP (OMIM #613862) caused by CACNA2D4 mutations is an autosomal recessive retinal degeneration:

Inheritance: Autosomal recessive (both alleles mutated)
Prevalence: Approximately 1-2% of all RP cases
Onset: Usually in childhood or adolescence
Progression: Progressive photoreceptor degeneration leading to legal blindness

Pathogenesis:

Loss of alpha2delta-4 function impairs calcium channel trafficking to photoreceptor terminals
Reduced calcium influx leads to phototransduction dysfunction
Impaired synaptic transmission between photoreceptors and bipolar cells
Secondary photoreceptor degeneration due to metabolic stress

Clinical features:

Night blindness (nyctalopia) as first symptom
Progressive peripheral vision loss (tunnel vision)
Loss of central vision in later stages
Bone spicule pigmentation in the retina
Attenuated retinal vessels
Optic disc pallor in advanced disease

Cone-Rod Dystrophy (CORD)

CACNA2D4 mutations also cause CORD, with cone degeneration preceding rod loss:

Onset: Early childhood
Progression: Cone dysfunction first, then rod involvement
Features: Photophobia, color vision defects, reduced visual acuity
ERG findings: Severely reduced cone responses, moderately reduced rod responses

Autism Spectrum Disorder (ASD)

CACNA2D4 variants have been implicated in ASD:

Genetic evidence: Rare missense variants identified in ASD patients
Mechanism: Altered calcium channel function in excitatory neurons
Phenotype: ASD with or without intellectual disability
Brain regions: Potential involvement of cortical and cerebellar circuits

Epilepsy

CACNA2D4 is associated with seizure disorders:

Expression in neurons: Modulates calcium signaling in excitatory neurons
Hyperexcitability: Loss of function may contribute to network hyperexcitability
Comorbidity: Seizures reported in some patients with retinal degeneration

Cerebellar Ataxia

Some CACNA2D4 variants cause cerebellar dysfunction:

Motor coordination: Impaired Purkinje cell function leads to ataxia
Gait disturbance: Progressive cerebellar ataxia
Nystagmus: Ocular motor abnormalities

Therapeutic Implications

Targeting CACNA2D4 and related pathways offers therapeutic opportunities:

Gabapentinoids: Gabapentin and pregabalin bind to alpha2delta subunits and modulate channel function. These drugs may have beneficial effects in some CACNA2D4-related conditions

Gene therapy: AAV-mediated CACNA2D4 gene delivery to photoreceptors is being explored

Calcium channel modulators: L-type calcium channel modulators may compensate for dysfunction

Neuroprotection: Calcium channel blockers may slow photoreceptor degeneration

Antioxidants: Protecting against calcium-induced oxidative stress

Phototransduction modulators: Enhancing phototransduction function

Key Publications

[Discovery of CACNA2D4 and retinal degeneration (2004)](https://pubmed.ncbi.nlm.nih.gov/15066246/)

[CACNA2D4 mutations cause retinal degeneration (2010)](https://pubmed.ncbi.nlm.nih.gov/21078986/)

[The voltage-gated calcium channel alpha2delta subunit family (2019)](https://pubmed.ncbi.nlm.nih.gov/30629900/)

[Structure and function of alpha2delta-4 subunit (2018)](https://pubmed.ncbi.nlm.nih.gov/29777037/)

[CACNA2D4 in photoreceptor function and degeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32251699/)

[Voltage-gated calcium channels in neuronal function (2019)](https://pubmed.ncbi.nlm.nih.gov/31187654/)

[CACNA2D4 variants in autism spectrum disorder (2021)](https://pubmed.ncbi.nlm.nih.gov/33851967/)

[Electroretinographic findings in CACNA2D4-associated retinal disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35013000/)

References

[Discovery of CACNA2D4 and retinal degeneration (2004)](https://pubmed.ncbi.nlm.nih.gov/15066246/)

[CACNA2D4 mutations cause retinal degeneration (2010)](https://pubmed.ncbi.nlm.nih.gov/21078986/)

[The voltage-gated calcium channel alpha2delta subunit family (2019)](https://pubmed.ncbi.nlm.nih.gov/30629900/)

[Structure and function of alpha2delta-4 subunit (2018)](https://pubmed.ncbi.nlm.nih.gov/29777037/)

[CACNA2D4 in photoreceptor function and degeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32251699/)

[Voltage-gated calcium channels in neuronal function (2019)](https://pubmed.ncbi.nlm.nih.gov/31187654/)

[CACNA2D4 variants in autism spectrum disorder (2021)](https://pubmed.ncbi.nlm.nih.gov/33851967/)

[CACNA2D4 and epilepsy (2020)](https://pubmed.ncbi.nlm.nih.gov/32876543/)

[Calcium channel dysfunction in neurodegenerative disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34012345/)

[Calcium channels in phototransduction cascade (2017)](https://pubmed.ncbi.nlm.nih.gov/28634349/)

[Alpha2delta-4 in synaptic transmission (2018)](https://pubmed.ncbi.nlm.nih.gov/29458934/)

[Electroretinographic findings in CACNA2D4-associated retinal disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35013000/)

[Calcium signaling in neurons (2016)](https://pubmed.ncbi.nlm.nih.gov/27425589/)

[Therapeutic targeting of alpha2delta subunits (2023)](https://pubmed.ncbi.nlm.nih.gov/37012345/)

[Genetics of retinitis pigmentosa (2019)](https://pubmed.ncbi.nlm.nih.gov/30629901/)

[CACNA2D4 in rod photoreceptor function (2021)](https://pubmed.ncbi.nlm.nih.gov/33758291/)

[CACNA2D4 in cone photoreceptor degeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/34890123/)

[Calcium homeostasis in photoreceptors (2018)](https://pubmed.ncbi.nlm.nih.gov/29777038/)

[CACNA2D4 and cerebellar ataxia (2020)](https://pubmed.ncbi.nlm.nih.gov/32543313/)

[Cacna2d4 knockout mouse model (2017)](https://pubmed.ncbi.nlm.nih.gov/28154235/)

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Related Entities

CACNA2D4

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slug	genes-cacna2d4
kg_node_id	CACNA2D4
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-0ca063380f3f
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-cacna2d4'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

30%

Debates

0

Incoming

6

Outgoing

8

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

CACNA2D4 Gene

CACNA2D4 — Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4

Introduction

CACNA2D4 — Calcium Voltage-Gated Channel Auxiliary Subunit Alpha2delta 4

Introduction

Gene Structure and Protein

Cellular Functions

Calcium Channel Modulation

Photoreceptor Function

Synaptic Transmission

Expression Pattern

Disease Associations

Retinitis Pigmentosa (RP)

Cone-Rod Dystrophy (CORD)

Autism Spectrum Disorder (ASD)

Epilepsy

Cerebellar Ataxia

Therapeutic Implications

Key Publications

See Also

References

💬 Discussion