Kcna4 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
KCNA4 (Potassium Voltage-Gated Channel Subfamily A Member 4) encodes the Kv1.4 subunit, a voltage-gated potassium channel protein that forms part of the delayed rectifier potassium channel complex. This gene is located on chromosome 11q14.1 and encodes a protein of 653 amino acids with a molecular weight of approximately 73 kDa.
| Property |
Value |
| Gene Symbol |
KCNA4 |
| Full Name |
Potassium Voltage-Gated Channel Subfamily A Member 4 |
| Chromosomal Location |
11q14.1 |
| NCBI Gene ID |
3745 |
| OMIM ID |
176267 |
| Ensembl ID |
ENSG00000113916 |
| UniProt ID |
P22459 |
The Kv1.4 protein is a member of the voltage-gated potassium channel (Kv) family and contains:
- Six transmembrane domains (S1-S6)
- Voltage sensor domain (S1-S4) that detects membrane potential changes
- Pore region (S5-S6) that forms the ion conduction pathway
- N-terminal domain containing inactivation ball peptide for fast inactivation
- Tetramerization domain (T1) in the N-terminus for subunit assembly
In the nervous system, Kv1.4 channels play crucial roles in:
- Neuronal excitability regulation - Controls action potential repolarization and firing patterns
- Neurotransmitter release - Modulates calcium entry through presynaptic voltage-gated calcium channels
- Synaptic plasticity - Influences long-term potentiation and depression
- Muscle contraction - Regulates cardiac and smooth muscle excitability
- Epilepsy - KCNA4 mutations have been associated with seizure disorders
- Ataxia - Channel dysfunction can lead to movement coordination deficits
- Neuropathic Pain - Altered channel expression contributes to pain hypersensitivity
- Amyotrophic Lateral Sclerosis (ALS) - Dysregulated potassium channel expression in motor neurons
- Cardiac Arrhythmias - Kv1.4 contributes to cardiac repolarization
- Long QT Syndrome - Some KCNA4 variants affect cardiac electrical activity
KCNA4 is expressed in:
- Hippocampus - CA1 and CA3 regions, particularly in pyramidal neurons
- Cerebral cortex - Layer-specific expression in cortical neurons
- Cerebellum - Purkinje cells and granule cells
- Substantia nigra - Dopaminergic neurons
- Cardiac tissue - Ventricular myocardium
Kv1.4 channels are being investigated as therapeutic targets for:
- Neuroprotective strategies - Modulating excitotoxicity in neurodegeneration
- Anti-epileptic drugs - Targeting aberrant neuronal firing
- Pain management - Developing selective channel modulators
- Stocker M, et al. (1999). "Subunit assembly of the voltage-gated potassium channel Kv1.4." J Biol Chem. PMID:10357815
- Misonou H, et al. (2005). "Kv1.4 subunit: a key molecule for neuronal vulnerability." ScientificWorldJournal. PMID:15772204
- Vacher H, et al. (2008). "Voltage-gated potassium channels: a structural overview." Adv Exp Med Biol. PMID:19157088
The study of Kcna4 Gene 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.
- Stocker M, et al. (1999). "Subunit assembly of the voltage-gated potassium channel Kv1.4." J Biol Chem. 274(45):32368-32376. PMID:10357815
- Misonou H, et al. (2005). "Kv1.4 subunit: a key molecule for neuronal vulnerability." ScientificWorldJournal. 5:394-401. PMID:15772204
- Vacher H, et al. (2008). "Voltage-gated potassium channels: a structural overview of Kv1, Kv2, Kv3, and Kv4." Adv Exp Med Biol. 614:1-21. PMID:19157088
- Grupe A, et al. (1990). "Cloning and expression of a human voltage-gated potassium channel. A novel member of the RCK family." EMBO J. 9(6):1749-1756. PMID:2157599
- Deal KK, et al. (1994). "The neuronal KV1 alpha subunit functions as part of voltage-gated potassium channels." J Neurosci. 14(5 Pt 1):2526-2541. PMID:7909236
- Song WJ, et al. (1998). "Genes for the neuronal voltage-gated potassium channel family." Brain Res Mol Brain Res. 56(1-2):18-28. PMID:9602103
- Rho JM, et al. (1999). "Molecular biology of potassium channels: implications for nervous system function and disease." Neuroscientist. 5(2):134-151. PMID:10214147
- Coetzee WA, et al. (1999). "Molecular diversity of K+ channel subunits in the nervous system." Ann N Y Acad Sci. 868:102-123. PMID:10414276