KCNK6 Gene

KCNK6 Gene

Overview

KCNK6 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCNK6 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>KCNK6</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Potassium Two Pore Domain Channel Subfamily K Member 6</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>19q13.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>9479</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000171303</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9Y5U5</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>TASK-3, K2P3.1, TWIK-3</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Effect</td>
</tr>
<tr>
<td class="label">Fluoxetine</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">Rottlerin</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">A1899</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">PD-118881</td>
<td>Activator</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/fibrosis" style="color:#ef9a9a">Fibrosis</a>, <a href="/wiki/heart-failure" style="color:#ef9a9a">Heart Failure</a>, <a href="/wiki/hypertension" style="color:#ef9a9a">Hypertension</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">18 edges</a></td>
</tr>
</table>

KCNK6 (Potassium Two Pore Domain Channel Subfamily K Member 6), also known as TASK-3 (TWIK-related acid-sensing potassium channel 3), is a gene located on chromosome 19q13.2 that encodes a pH-sensitive two-pore domain potassium channel highly expressed in the brain [@shieh2000]. The KCNK6 protein forms homodimers or heterodimers with other two-pore domain channels (like KCNK3/TASK-1) to create background potassium channels that regulate neuronal excitability. While primarily studied in the context of depression, epilepsy, and cancer, emerging research suggests potential roles in neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease) through its effects on neuronal survival, pH regulation, and excitotoxicity [@weil2006].

The gene is catalogued as NCBI Gene ID [9479](https://www.ncbi.nlm.nih.gov/gene/9479), Ensembl ID ENSG00000171303, and UniProt [Q9Y5U5](https://www.uniprot.org/uniprot/Q9Y5U5).

Gene Information

Function

Channel Properties

KCNK6/TASK-3 is a member of the two-pore domain potassium channel (K2P) family, which produces background leak currents that set the resting membrane potential [@shieh2000]. Key properties include:

• pH sensitivity: TASK-3 channels are highly sensitive to extracellular pH, with activity inhibited by acidic pH (IC50 ~6.3)
• Volatile anesthetics: Activated by halogenated anesthetics like halothane and isoflurane
• Stretch sensitivity: Mechanical stretch can modulate channel activity
• Protein kinase modulation: Phosphorylation by PKC modulates channel function

Neuronal Expression

KCNK6 is highly expressed in:

• Hypothalamus: Particularly in the supraoptic and paraventricular nuclei
• [Cortex](/brain-regions/cortex): Layer 5 pyramidal [neurons](/entities/neurons)
• Thalamus: Thalamic relay neurons
• Substantia Nigra: Dopaminergic neurons express TASK-3 channels
• [Hippocampus](/brain-regions/hippocampus): CA1 pyramidal neurons

Physiological Roles

• Resting membrane potential: Contributes to the leak conductance that sets neuronal resting potential
• pH homeostasis: Acts as a pH sensor in brain regions with variable pH
• Hormone release: Modulates hypothalamic hormone secretion (vasopressin, oxytocin)
• Sleep-wake regulation: Hypothalamic TASK channels influence arousal states

Disease Associations

Depression

TASK-3 channels have been implicated in depression pathophysiology [@weil2006]:

• Expression changes: Reduced TASK-1/TASK-3 expression in prefrontal cortex of depressed patients
• Antidepressant effects: Some antidepressants (fluoxetine) block TASK-3 channels
• Stress response: Chronic stress alters TASK channel expression
• Therapeutic targeting: TASK-3 selective modulators are being investigated

Epilepsy

TASK channels play complex roles in seizure disorders [@meuth2009]:

• pH sensitivity: Acidic pH during seizures inhibits TASK currents
• Seizure termination: TASK activation may contribute to seizure termination
• Anti-epileptic drugs: Levetiracetam may modulate TASK-3 activity
• Absence seizures: Thalamic TASK channels implicated in spike-wave discharges

Neurodegenerative Diseases

Alzheimer's Disease

Emerging evidence links KCNK6 to [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis:

• Neuronal excitability: [Aβ](/proteins/amyloid-beta) peptides alter TASK channel function, affecting excitability
• pH dysregulation: Brain pH changes in AD may affect TASK-3 activity
• Calcium dysregulation: TASK channels indirectly influence calcium influx
• Synaptic dysfunction: Altered background currents may contribute to synaptic deficits

Parkinson's Disease

Potential roles in [Parkinson's disease](/diseases/parkinsons-disease) include:

• Dopaminergic neuron survival: TASK channels may protect dopaminergic neurons
• Oxidative stress: TASK-3 expression may be modulated by oxidative stress
• Mitochondrial dysfunction: Interactions with mitochondrial function
• Motor control: Basal ganglia excitability involves TASK channels

Cancer

KCNK6/TASK-3 is overexpressed in several cancers [@patel2004]:

• Breast cancer
• Glioma
• Lung cancer
• Ovarian cancer
• Prostate cancer

Therapeutic Implications

Drug Development

TASK-3 channels represent therapeutic targets:

• Depression: Selective TASK-3 activators as novel antidepressants
• Epilepsy: TASK modulators as anticonvulsants
• Cancer: TASK-3 blockers as anticancer agents
• Pain: TASK-1/3 modulators for analgesia

Channel Modulators

Interactions

Protein Interactions

• KCNK3 (TASK-1): Forms heterodimers
• KCNK9 (TASK-3): Brain-specific partner
• 14-3-3 proteins: Channel trafficking
• PICK1: PDZ domain interactions

Signaling Pathways

• p38 MAPK: Stress-induced modulation
• PKC: Phosphorylation
• cAMP/PKA: Modulation
• PI3K/Akt: Survival signaling

See Also

• [Genes Index](/genes)
• [Potassium Channels](/proteins)
• [Two-Pore Domain Channels](/mechanisms)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Epilepsy](/diseases/epilepsy)
• [Depression](/diseases/depression)
• [Mechanisms Index](/mechanisms)

External Links

• [NCBI Gene: KCNK6](https://www.ncbi.nlm.nih.gov/gene/9479)
• [UniProt: KCNK6](https://www.uniprot.org/uniprot/Q9Y5U5)
• [Ensembl: KCNK6](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000171303)
• [IUPHAR/BPS Guide: K2P channels](https://guidetopharmacology.org/GRAC/LectureF540)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving KCNK6 Gene discovered through SciDEX knowledge graph analysis: