CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I

CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CACNA1I</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>CACNA1I - Calcium Voltage-Gated Channel Subunit Alpha1 I</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=CACNA1I" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Cacna1I Gene Calcium Voltage Gated Channel Subunit Alpha1 I is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@lipscombe2013]
[@catterall2011]

Overview

CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CACNA1I</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>CACNA1I - Calcium Voltage-Gated Channel Subunit Alpha1 I</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=CACNA1I" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Cacna1I Gene Calcium Voltage Gated Channel Subunit Alpha1 I is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@lipscombe2013]
[@catterall2011]

Overview

CACNA1I encodes the Cav3.3 calcium channel alpha1 subunit, a member of the T-type (low-voltage activated) calcium channel family. This gene is located on chromosome 22q12.3 and encodes a protein of 2,226 amino acids. Cav3.3 channels are characterized by their low-voltage activation, rapid inactivation, and important roles in neuronal pacemaking and thalamic signaling. [@zamponi2015]

Function

Cav3.3 (T-type) calcium channels are crucial for: [@evans2013]

• Neuronal rhythmicity: Generate low-threshold calcium spikes in thalamic and cortical [neurons](/entities/neurons)
• Thalamic oscillations: Critical for sleep spindles and absence seizures
• Dendritic integration: Mediate back-propagation of calcium signals
• Gene expression: Activate calcium-dependent signaling cascades

• Resting membrane potential regulation
• Burst firing in thalamocortical neurons
• Sleep-wake transitions
• Sensory processing, especially in pain pathways

Disease Associations

Alzheimer's Disease (AD)

• Enhanced Cav3.3 activity contributes to thalamic hyperexcitability
• Dysregulated calcium signaling promotes amyloid processing
• May accelerate [tau](/proteins/tau) pathology through calcium-dependent kinases
• Sleep spindle deficits linked to Cav3.3 dysfunction

Parkinson's Disease (PD)

• Altered T-type channel function in basal ganglia
• Contributes to abnormal burst firing in subthalamic nucleus
• May affect levodopa-induced dyskinesias
• Thalamic processing deficits in PD patients

Epilepsy and Absence Seizures

• CACNA1I mutations cause childhood absence epilepsy
• Gain-of-function mutations increase thalamic burst firing
• Channel blockers effective in treating absence seizures
• Specific mutations linked to generalized epilepsy

Schizophrenia

• CACNA1I variants associated with schizophrenia risk
• Altered channel function affects gamma oscillations
• May contribute to cognitive deficits
• Potential target for antipsychotic drug development

Neuropathic Pain

• Cav3.3 channels in dorsal horn neurons mediate pain signaling
• Upregulation in chronic pain states
• T-type channel blockers reduce neuropathic pain
• Therapeutic potential for pain management

Expression Pattern

Cav3.3 is expressed in:

• Thalamic relay neurons (ventrobasal, intralaminar nuclei)
• Cortical layer 5 pyramidal neurons
• Dorsal horn spinal cord neurons
• Hippocampal interneurons
• Cerebellar granule cells
• Retinal ganglion cells

Molecular Mechanisms

Channel Structure

• Ten transmembrane segments (repeat I-IV)
• Voltage sensor in each repeat's S4 segment
• DHP-sensitive pore region
• Multiple splice variants with distinct properties

Regulation

• Alternative splicing modulates biophysical properties
• Phosphorylation by PKA and PKC alters gating
• G-protein modulation affects channel activity
• Lipid modulation (phosphatidylinositol 4,5-bisphosphate)

Signaling Pathways

• Coupling to calcium-activated potassium channels
• Activation of calcineurin and CaMKII
• Regulation of CREB-mediated gene expression
• Interaction with [NMDA](/entities/nmda-receptor) receptor signaling

Therapeutic Targeting

T-Type Channel Blockers

• Ethosuximide: First-line for absence seizures
• Zonisamide: Broad-spectrum anticonvulsant
• Mibefradil: Cav3.x selective blocker (withdrawn from market)

Specific Modulators

• TTA-A2: Selective Cav3.3 antagonist
• ST101: Cognition-enhancing compound
• A-987306: Analgesic T-type channel blocker

Research Directions

• Allele-specific oligonucleotides for gain-of-function mutations
• Gene therapy using CRISPR editing
• Targeted drug delivery to specific brain regions

Key Publications

See Also

• [T-Type Calcium Channels](/entities/t-type-calcium-channels)
• [Ion Channelopathies](/mechanisms/ion-channelopathies)
• [Thalamic Signaling](/mechanisms/thalamic-circuitry)
• [Epilepsy](/diseases/epilepsy)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [NCBI Gene: CACNA1I](https://www.ncbi.nlm.nih.gov/gene/8912)
• [UniProt: Q9P0X4](https://www.uniprot.org/uniprot/Q9P0X4)
• [OMIM: 607957](https://www.omim.org/entry/607957)
• [GeneCards: CACNA1I](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CACNA1I)

Background

The study of Cacna1I Gene Calcium Voltage Gated Channel Subunit Alpha1 I 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.

Brain Atlas Resources

• Allen Human Brain Atlas: [Expression data for CACNA1I](https://human.brain-map.org/microarray/search/show?search_term=CACNA1I)
• Allen Cell Type Atlas: [Cell type expression data](https://celltype.brain-map.org/)
• BrainSpan Atlas: [Developmental transcriptome data](https://www.brainspan.org/)

See Also

• [Calcium Channels](/calcium-channels)
• [Ion Channels](/ion-channels)
• [Voltage-Gated Ion Channels](/voltage-gated-ion-channels)

External Links

• [CACNA1I Gene - NCBI](https://www.ncbi.nlm.nih.gov/gene/8912)

Brain Atlas Resources

• Allen Human Brain Atlas: [Expression data for CACNA1I](https://human.brain-map.org/microarray/search/show?search_term=CACNA1I)
• Allen Cell Type Atlas: [Cell type expression data](https://celltype.brain-map.org/)
• BrainSpan Atlas: [Developmental transcriptome data](https://www.brainspan.org/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving CACNA1I Gene - Calcium Voltage-Gated Channel Subunit Alpha1 I discovered through SciDEX knowledge graph analysis: