Cacna1A — Calcium Channel Alpha 1A Subunit 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 CACNA1A gene encodes the Cav2.1 (P/Q-type) voltage-gated calcium channel alpha1A subunit, which mediates calcium influx in neurons and controls neurotransmitter release at presynaptic terminals. Cav2.1 channels are crucial for synaptic transmission, motor coordination, and cerebellar function. Mutations in CACNA1A cause several neurological disorders including familial hemiplegic migraine, ataxia, and epilepsy. [@brown2023]
This gene is involved in: [@wilson2023]
Calcium influx: Mediates voltage-gated calcium entry in neurons
Neurotransmitter release: Controls synaptic vesicle fusion and exocytosis
Motor control: Regulates cerebellar function and coordination
The CACNA1A gene encodes the P/Q-type voltage-gated calcium channel alpha-1A subunit (Cav2.1), which is essential for synaptic transmission and neuronal excitability. This channel is predominantly expressed in cerebellar Purkinje cells and hippocampal [neurons](/entities/neurons), where it mediates:
Presynaptic Calcium Influx: Critical for neurotransmitter release at synaptic terminals
Synaptic Plasticity: Regulates [long-term potentiation](/mechanisms/long-term-potentiation) (LTP) and depression (LTD)
Cerebellar Function: Essential for motor coordination and learning
Channel Properties: High-voltage activated channel with rapid inactivation
Disease Associations
Episodic Ataxias
EA2 (Episodic Ataxia Type 2): Loss-of-function mutations cause ataxia with acetazolamide responsiveness
EA1 (Episodic Ataxia Type 1): Less common, associated with myokymia
Spinocerebellar Ataxias
SCA6 (Spinocerebellar Ataxia Type 6): CAG repeat expansion in CACNA1A causes progressive ataxia
SCA2 and SCA15: Other SCA subtypes linked to CACNA1A
Epilepsy
Absence Epilepsy: P/Q-type channel dysfunction leads to generalized spike-wave discharges
Febrile Seizures: Associated with specific mutations
Epileptic Encephalopathies: Severe de novo mutations
Alzheimer's Disease
Calcium Dysregulation: P/Q channel dysfunction contributes to intracellular calcium imbalance
Synaptic Failure: Loss of Cav2.1 function impairs synaptic plasticity in AD models
Therapeutic Target: Calcium channel modulators being investigated
Parkinson's Disease
Motor Complications: P/Q channel dysfunction may contribute to levodopa-induced dyskinesias
Neuroprotection: Cav2.1 modulators explored for PD therapeutics
Migraine
Familial Hemiplegic Migraine (FHM1): Gain-of-function mutations cause migraine with aura
Common Migraine: Variants associated with sporadic migraine risk
Expression Pattern
Key Publications
CACNA1A mutations in episodic ataxia and epilepsy - Brain (2019) - [DOI:10.1093/brain/awz113](https://doi.org/10.1093/brain/awz113)
The study of Cacna1A — Calcium Channel Alpha 1A Subunit 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 - cacna1a Expression](https://human.brain-map.org/microarray/search/show?search_term=cacna1a)
[Allen Cell Type Atlas - cacna1a](https://celltypes.brain-map.org/)