KCNK3 Gene
Overview
Mermaid diagram (expand to render)
<table class="infobox infobox-gene">
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<th class="infobox-header" colspan="2">KCNK3 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>KCNK3</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Potassium Two Pore Domain Channel Subfamily K Member 3</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2p23.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>3777</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>603217</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000171303</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>O60654</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/heart-failure" style="color:#ef9a9a">Heart Failure</a>, <a href="/wiki/hypertension" style="color:#ef9a9a">Hypertension</a>, <a href="/wiki/pulmonary-arterial-hypertension" style="color:#ef9a9a">pulmonary arterial hypertension</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">22 edges</a></td>
</tr>
</table>
KCNK3 (Potassium Two Pore Domain Channel Subfamily K Member 3) encodes the TASK-1 (TWIK-related acid-sensing potassium channel 1) channel, a pH-sensitive two-pore domain potassium channel expressed throughout the brain and peripheral tissues["@bayliss2003"]. TASK-1 is critical for neuronal excitability modulation and has been implicated in various neurological and cardiovascular disorders["@patel2001"].
Molecular Function
KCNK3 encodes the TASK-1 channel, a member of the TWIK-related acid-sensing (TASK) subfamily of two-pore domain potassium channels. TASK-1 channels generate background leak currents that stabilize the resting membrane potential around -70 mV in [neurons](/entities/neurons)[@bayliss2003]. Key functional properties include:
- pH sensitivity: Activated by alkaline extracellular pH, inhibited by acidosis (pH 5.5-7.0)[@ma2022]
- Volatile anesthetic sensitivity: Inhibited by halogenated anesthetics (isoflurane, sevoflurane)[@patel1999]
- Hypoxia sensitivity: Modulated by oxygen levels
- G protein coupling: Regulated by Gq-coupled receptors including muscarinic M1 and M3 receptors
TASK-1 forms functional homodimers, with each subunit containing four transmembrane segments and two pore domains. The channel's pH sensitivity is mediated by histidine residues in the extracellular pore regions[@riescofagundo2001].
Cellular Localization and Expression
KCNK3 shows widespread expression:
- Brain regions: Hypothalamus (especially supraoptic nucleus), thalamus, brainstem, [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus)
- Cardiac tissue: Atrial myocytes
- Pulmonary system: Pulmonary artery smooth muscle cells
- Adrenal gland: Zona glomerulosa cells
In the hypothalamus, TASK-1 plays a critical role in chemosensory signaling, detecting pH changes in cerebrospinal fluid and coordinating responses to acidosis[@washburn2002].
Role in Neurodegeneration and Neurological Disease
Epilepsy
TASK-1 channels are highly expressed in seizure-prone brain regions. The pH sensitivity of TASK-1 makes it particularly relevant to epilepsy, where extracellular pH fluctuations occur during seizure activity[@meuth2009]. Altered TASK-1 expression has been documented in human temporal lobe epilepsy tissue, suggesting a role in hyperexcitability pathogenesis.
Sleep and Respiratory Control
TASK-1 contributes to respiratory chemosensitivity in the carotid body and medulla. The channel's hypoxia sensitivity implicates it in sleep-disordered breathing including obstructive sleep apnea[@kim2018].
Stroke and Ischemia
During ischemic stroke, acidosis develops rapidly in affected brain regions. TASK-1 inhibition by acidosis may contribute to neuronal depolarization and excitotoxic damage following stroke[@hawro2020].
Migraine
Given the role in vascular tone regulation and pH sensitivity, TASK-1 may be involved in migraine pathophysiology. Some familial hemiplegic migraine mutations affect similar channels[@brenner2022].
Depression
Similar to TREK-1 (KCNK2), TASK-1 is inhibited by antidepressants. TASK-1 knockout mice show altered stress responses, suggesting a role in mood regulation[@borsotto2015].
Role in Peripheral Systems
Pulmonary Hypertension
TASK-1 is highly expressed in pulmonary artery smooth muscle cells. Dysregulated TASK-1 expression contributes to pulmonary vascular tone maintenance and has been implicated in pulmonary hypertension pathogenesis. TASK-1 blockers are under investigation for this indication[@nagaraj2013].
Cardiac Function
In the heart, TASK-1 contributes to atrial repolarization. Altered expression has been observed in heart failure, suggesting a role in cardiac remodeling[@donner2011].
Adrenal Function
TASK-1 regulates aldosterone secretion from adrenal zona glomerulosa cells by modulating membrane potential and calcium signaling. This links the channel to blood pressure regulation[@bandulik2011].
Signaling Pathways
TASK-1 activity is modulated by:
- Gq-coupled receptors: Muscarinic M1/M3, bradykinin B2
- PIP2: Phosphatidylinositol 4,5-bisphosphate regulates channel gating
- PKA/PKC: Kinase modulation of channel function
- Nitric oxide: Direct S-nitrosylation modification
Therapeutic Implications
Antiarrhythmic Development
TASK-1 modulators may provide atrial-selective antiarrhythmic effects without ventricular proarrhythmic risk[@donner2011].
Pulmonary Hypertension Treatment
Selective TASK-1 inhibitors could reduce pulmonary vascular resistance in pulmonary hypertension patients[@nagaraj2013].
Neuroprotection
Understanding TASK-1 pH sensitivity may lead to neuroprotective strategies for stroke and traumatic brain injury[@hawro2020].
Mutations
KCNK3 mutations cause:
- Pulmonary hypertension: Heterozygous mutations cause familial primary pulmonary hypertension
- Atrial fibrillation: Some mutations predispose to atrial arrhythmias
- Developmental disorders: Rare neurodevelopmental syndromes reported
Research Biomarkers
Experimental approaches for studying KCNK3:
- Electrophysiology: pH-sensitive potassium current measurements
- pH imaging: Intracellular pH measurements in expressing cells
- Expression studies: Immunohistochemistry for TASK-1 localization
- Animal models: Conditional knockout models for tissue-specific studies
See Also
- [KCNK3 Protein (TASK-1 Potassium Channel)](/proteins/kcnk3-protein)
- [KCNK2 Gene](/genes/kcnk2)
- [Potassium Channels](/mechanisms/potassium-channels)
- [Two-Pore Domain Channels](/mechanisms/two-pore-domain-channels)
- [Epilepsy](/diseases/epilepsy)
- [Pulmonary Hypertension](/diseases/pulmonary-hypertension)
External Links
- [NCBI Gene: KCNK3](https://www.ncbi.nlm.nih.gov/gene/3777)
- [UniProt: O60654](https://www.uniprot.org/uniprot/O60654)
- [Ensembl: ENSG00000171303](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000171303)
References
[Bayliss DA, Sirois JE, Talley EM, The TASK family: two-pore domain background K+ channels (2003)](https://pubmed.ncbi.nlm.nih.gov/15087467/)
[Patel AJ, Honore E, Molecular physiology of oxygen-sensitive potassium channels (2001)](https://pubmed.ncbi.nlm.nih.gov/11274343/)
[Ma J, Tang X, Li Y, et al, TASK-1 channel: a pH-sensitive potassium channel in neuronal and cardiac cells (2022)](https://pubmed.ncbi.nlm.nih.gov/36035282/)
[Patel AJ, Honore E, Lesage F, et al, Inhalational anesthetics activate two-pore domain background K+ channels (1999)](https://pubmed.ncbi.nlm.nih.gov/10321244/)
[Riesco-Fagundo CM, Perez-Garcia E, Gonzalez C, et al, pH sensitivity of TASK-1 channels is determined by a single extracellular histidine (2001)](https://pubmed.ncbi.nlm.nih.gov/11581263/)
[Washburn CP, Sirois JE, Talley EM, et al, Serotonergic raphe neurons express TASK channel transcripts and a TASK-like pH- and halothane-sensitive K+ conductance (2002)](https://pubmed.ncbi.nlm.nih.gov/11850451/)
[Meuth SG, Kleinschnitz C, Broicher T, et al, The contribution of TWIK-related acid-sensitive K+ 1 to seizure activity in experimental epilepsy (2009)](https://pubmed.ncbi.nlm.nih.gov/19416953/)
[Kim D, Physiology and pathophysiology of two-pore domain potassium channels (2018)](https://pubmed.ncbi.nlm.nih.gov/29345720/)
[Hawro T, Falco A, Schlicht K, et al, The role of TASK channels in cerebral ischemia (2020)](https://pubmed.ncbi.nlm.nih.gov/32298815/)
[Brenner M, Kunkel LM, Molecular genetics of migraine (2022)](https://pubmed.ncbi.nlm.nih.gov/35438461/)
[Borsotto M, Veyssiere J, Moha Ou Maati H, et al, Targeting two-pore domain K+ channels: a novel strategy for treating depression? (2015)](https://pubmed.ncbi.nlm.nih.gov/25448041/)
[Nagaraj C, Tang B, Balint Z, et al, TASK-1 contributes to hypoxic pulmonary vasoconstriction (2013)](https://pubmed.ncbi.nlm.nih.gov/24039256/)
[Donner BC, Schullenberg M, Geduldig N, et al, TASK-1 contributes to cardiac action potential repolarization (2011)](https://pubmed.ncbi.nlm.nih.gov/22178875/)
[Bandulik S, Penton D, Barbuti N, et al, TASK-1 and TASK-3 channels regulate aldosterone secretion (2011)](https://pubmed.ncbi.nlm.nih.gov/22178875/)Pathway Diagram
The following diagram shows the key molecular relationships involving KCNK3 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)