KCNK9 Gene

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KCNK9 Gene

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KCNK9 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCNK9 — TASK-3 (Two-pore domain potassium channel)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>KCNK9</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>TASK-3 (Two-pore domain potassium channel)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>8q24.22</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/51302" target="_blank">51302</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000149402" target="_blank">ENSG00000149402</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/607366" target="_blank">607366</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9NPC2" target="_blank">Q9NPC2</a></td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel (Two-pore domain K+ channel)</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain (cortex, thalamus, hippocampus), peripheral tissues</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Alzheimer's Disease, Parkinson's Disease, ALS, Neurodevelopmental disorders</td>
</tr>
</table>

KCNK9 — TASK-3 (Two-Pore Domain Potassium Channel)

Overview

...

KCNK9 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCNK9 — TASK-3 (Two-pore domain potassium channel)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>KCNK9</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>TASK-3 (Two-pore domain potassium channel)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>8q24.22</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/51302" target="_blank">51302</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000149402" target="_blank">ENSG00000149402</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/607366" target="_blank">607366</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9NPC2" target="_blank">Q9NPC2</a></td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel (Two-pore domain K+ channel)</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain (cortex, thalamus, hippocampus), peripheral tissues</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Alzheimer's Disease, Parkinson's Disease, ALS, Neurodevelopmental disorders</td>
</tr>
</table>

KCNK9 — TASK-3 (Two-Pore Domain Potassium Channel)

Overview

KCNK9 (also known as TASK-3, encoded by the KCNK9 gene) is a member of the two-pore domain potassium channel family. These channels play critical roles in regulating neuronal resting membrane potential, excitability, and cellular homeostasis. TASK-3 channels have emerged as important players in neurodegenerative disease pathogenesis, with dysfunction implicated in Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis[@berg2005].

The KCNK9 gene encodes a protein that forms functional potassium channels in the plasma membrane, contributing to the regulation of neuronal function, astrocyte metabolism, and cellular stress responses. Understanding TASK-3 channel biology provides insights into novel therapeutic targets for neurodegenerative disorders[@bayliss2015].

Gene and Protein Structure

Gene Organization

The KCNK9 gene (NCBI Gene ID: 51302) is located on chromosome 8q24.22 and consists of multiple exons encoding the TASK-3 potassium channel protein. The gene spans a genomic region that includes regulatory elements controlling expression in neural tissues[@ncbi].

Key Features:

Chromosomal location: 8q24.22
Genomic size: ~20 kb
Exon count: 4-5 exons (depending on splice variant)
Transcript length: ~4.5 kb

Protein Structure

TASK-3 is a integral membrane protein with characteristic two-pore domain architecture[@weber1999]:

Structural Features:

Two pore domains (P1 and P2): Each pore domain contains the characteristic K+ selectivity filter sequence (GYG)
Four transmembrane segments (M1-M4): Form the channel pore
N-terminal and C-terminal domains: Located intracellularly
Dimerization domain: TASK-3 channels function as homodimers or heterodimers with TASK-1 (KCNK3)

Channel Properties:

Conductance: ~30-40 pS
Single channel conductance: 14 pS in physiological conditions
Rectification: Weakly inward-rectifying
pH sensitivity: TASK-3 is regulated by extracellular pH (inhibited by acidic pH)

Physiological Function

Neuronal Expression and Distribution

TASK-3 channels exhibit widespread expression throughout the central nervous system[@kelley1998]:

Brain Regions:

Cerebral cortex: Layer 2/3 pyramidal neurons
Thalamus: Thalamic relay neurons
Hippocampus: CA1-CA3 pyramidal neurons, dentate gyrus
Substantia nigra: Dopaminergic neurons
Brainstem: Respiratory centers
Cerebellum: Purkinje cells, granule cells

Cellular Localization:

Neuronal soma: Somatic membrane
Dendrites: Dendritic shaft and spines
Axon initial segment: Regulation of action potential initiation
Synaptic terminals: Modulation of neurotransmitter release

Functional Roles in Neurons

TASK-3 channels contribute to multiple neuronal functions[@lauriat2003]:

1. Resting Membrane Potential:

Contributes to the resting membrane potential
Provides background K+ conductance
Stabilizes neuronal excitability

2. Neuronal Excitability:

Modulates firing frequency
Regulates input resistance
Controls after-hyperpolarization

3. Synaptic Transmission:

Presynaptic TASK-3 regulates neurotransmitter release
Postsynaptic TASK-3 modulates synaptic integration
Contributes to short-term plasticity

4. Dendritic Integration:

Influences dendritic spike generation
Modulates synaptic integration
Affects spatial memory mechanisms

Role in Astrocytes

TASK-3 channels are also expressed in astrocytes, where they play crucial roles in brain homeostasis[@chen2020]:

Astrocyte Functions:

Regulation of membrane potential
Potassium siphoning (K+ clearance from synaptic clefts)
Mitochondrial function
Calcium signaling
Metabolic support of neurons

Pathophysiology in Neurodegenerative Diseases

Alzheimer's Disease

TASK-3 channels have been directly implicated in Alzheimer's disease pathogenesis[@kim2012]:

Dysfunction in AD:

TASK-3 channel expression is reduced in AD brain
Channel dysfunction contributes to neuronal hyperexcitability
Impaired astrocytic TASK-3 affects amyloid clearance

5xFAD Mouse Model:

TASK-3 deficiency accelerates amyloid pathology
Loss of TASK-3 increases neuronal death
Restoring TASK-3 improves cognitive function

Therapeutic Implications:

TASK-3 activators may be neuroprotective
Targeting astrocytic TASK-3 could enhance amyloid clearance
Modulating neuronal TASK-3 may reduce hyperexcitability

Parkinson's Disease

Emerging evidence links TASK-3 to Parkinson's disease[@tauchen2020]:

Dopaminergic Neurons:

TASK-3 is expressed in substantia nigra dopaminergic neurons
Channel dysfunction may contribute to neuronal vulnerability
Mitochondrial function is regulated by TASK-3

Genetic Associations:

KCNK9 polymorphisms have been associated with PD risk
Variants may affect channel function or expression
Further studies needed to confirm association

Amyotrophic Lateral Sclerosis

TASK-3 channels may play a role in ALS pathogenesis:

Motor Neuron Vulnerability:

TASK-3 expression in motor neurons
Channel dysfunction could contribute to excitotoxicity
Mitochondrial dysfunction in ALS involves TASK-3

Astrocyte Dysfunction:

ALS astrocytes show impaired K+ handling
TASK-3 dysfunction may contribute to motor neuron death
Targeting astroglial TASK-3 may be therapeutic

Neurodevelopmental Disorders

KCNK9 mutations cause a neurodevelopmental disorder characterized by developmental delay, intellectual disability, and facial dysmorphism (KCNK9 imprinting syndrome)[@winkler2021][@riddell2017]:

Clinical Features:

Global developmental delay
Intellectual disability
Hypotonia
Characteristic facial features
Seizures in some patients

Mechanism:

Loss-of-function mutations
Impaired channel function
Disrupted neuronal development

Therapeutic Implications

Drug Development

TASK-3 channels represent promising therapeutic targets[@gierten2020]:

Small Molecule Modulators:

TASK-3 activators (e.g., retigabine analog)
TASK-3 inhibitors (for specific applications)
pH-sensitive compounds

Therapeutic Strategies:

| Condition | Strategy | Rationale |
|-----------|----------|----------|
| Alzheimer's Disease | TASK-3 activation | Neuroprotection, amyloid clearance |
| Parkinson's Disease | TASK-3 modulation | Mitochondrial function |
| ALS | TASK-3 targeting | Motor neuron survival |
| Epilepsy | TASK-3 modulation | Reduce hyperexcitability |
| Depression/Anxiety | TASK-3 inhibition | Anxiolytic effects |

Challenges

Selectivity Issues:

TASK-3 shares similarity with other two-pore domain channels
Developing selective compounds is challenging
Heterodimerization with TASK-1 complicates targeting

Blood-Brain Barrier:

CNS penetration required for neurological applications
Physicochemical properties affect delivery
Prodrug approaches may be necessary

Mitochondrial Function

TASK-3 channels regulate mitochondrial function in neurons[@honrath2017][@he2014]:

Mitochondrial Localization

TASK-3 localizes to mitochondrial membranes
Channel regulates mitochondrial K+ flux
Modulates mitochondrial membrane potential

Bioenergetics

Functions:

ATP production regulation
Calcium handling
Reactive oxygen species (ROS) production
Mitochondrial permeability transition

Implications:

Mitochondrial dysfunction in neurodegeneration
TASK-3 as mitochondrial therapeutic target
Neuroprotection via mitochondrial modulation

Neurogenesis

TASK-3 channels regulate neurogenesis in the adult brain[@ying2019]:

Subventricular Zone

TASK-3 is expressed in neural stem cells
Channel regulates proliferation
Differentiation is modulated by TASK-3

Therapeutic Potential

Enhancing neurogenesis in neurodegenerative disease
TASK-3 as target for regenerative therapies
Implications for stroke and brain injury

Regional Expression in the Brain

Cortex

TASK-3 channels exhibit distinct expression patterns across cortical layers[@kelley1998]:

Layer-Specific Distribution:

Layer 2/3: High TASK-3 expression in pyramidal neurons
Layer 4: Moderate expression in excitatory neurons
Layer 5/6: Strong expression in corticothalamic projection neurons

Cellular Functions in Cortex:

Regulation of cortical pyramidal neuron excitability
Modulation of intracortical connectivity
Control of cortical output to subcortical structures

Hippocampus

The hippocampus shows particularly rich TASK-3 expression[@yost2003]:

CA Regions:

CA1 pyramidal neurons: TASK-3 contributes to resting conductance
CA2: Unique pattern of expression
CA3: Mossy fiber terminals express TASK-3

Dentate Gyrus:

Granule cell layer expresses TASK-3
Hilus interneurons show high TASK-3 levels
Regulation of dentate gating function

Substantia Nigra

TASK-3 in dopaminergic neurons has specific implications for Parkinson's disease[@tauchen2020]:

Vulnerability Factors:

TASK-3 regulates nigral neuron resting potential
Contributes to activity-dependent calcium handling
Mitochondrial function linked to TASK-3 activity

Therapeutic Implications:

TASK-3 modulators may protect dopaminergic neurons
Channel activation could reduce neuronal vulnerability
Combined approach with mitochondrial targeting

Thalamus

Thalamic relay neurons express TASK-3 channels[@bayliss2015]:

Thalamic Circuitry:

First-order nuclei: High TASK-3 expression
Higher-order nuclei: Moderate expression
Reticular nucleus: Interneuron-specific patterns

Functional Role:

Regulation of thalamic burst firing
Control of sensory transmission
Modulation of arousal states

Channel Trafficking and Localization

Membrane Expression

TASK-3 trafficking involves multiple steps[@weber1999]:

Biosynthetic Pathway:

Protein synthesis in rough ER

Quality control in Golgi apparatus

Vesicular transport to plasma membrane

Surface expression and turnover

Regulatory Factors:

ER retention signals
Chaperone protein interactions
Endocytic recycling rates

Subcellular Localization

TASK-3 shows distinct subcellular patterns[@meuth2006]:

Somatic Localization:

Even distribution across soma membrane
Concentration at axon initial segment
Exclude from dendritic shafts

Axonal Compartments:

Present at axon initial segment
Synaptic terminal membranes
Nodes of Ranvier (in myelinated axons)

Presynaptic Function:

Regulates neurotransmitter release probability
Modulates short-term plasticity
Controls quantal content

Structural Biology

Pore Domain Architecture

TASK-3 channels share structural features with other K2P channels[@yost2003]:

Transmembrane Segments:

M1: N-terminal transmembrane helix
P1: First pore loop with selectivity filter
M2: Central transmembrane helix
P2: Second pore loop
M3: Third transmembrane helix
M4: C-terminal transmembrane helix

Selectivity Filter:

Signature sequence: TXXYGDWG
Potassium selectivity mechanism
Conductance properties

Dimerization

TASK-3 functions as dimers[@rudy2001]:

Dimer Interface:

M4 helices form dimerization domain
Extracellular cap domains interact
Intracellular C-terminal interaction

Heterodimer Formation:

TASK-1/TASK-3 heterodimers common
Altered pharmacological profile
Tissue-specific combination

Role in Neuroinflammation

Glial Cell Expression

TASK-3 is expressed in various glial cells[@chen2020]:

Astrocytes:

Regulates astrocyte membrane potential
Potassium siphoning function
Metabolic coupling to neurons

Microglia:

TASK-3 in microglial processes
Migration and chemotaxis
Inflammatory response modulation

Oligodendrocytes:

Myelinating glial expression
White matter function
Demyelination disease relevance

Neuroinflammatory Diseases

TASK-3 dysfunction contributes to neuroinflammatory processes:

Multiple Sclerosis:

Altered glial TASK-3 in demyelination
Inflammation-driven channel downregulation
Therapeutic targeting potential

Neuropathic Pain:

Glial contribution to chronic pain
TASK-3 in satellite glia
Neuron-glia signaling

Clinical and Translational Aspects

Biomarker Potential

TASK-3 as a disease biomarker[@muir2016]:

Peripheral Measurements:

TASK-3 in blood cells
Exosome-associated TASK-3
Correlation with disease severity

Imaging Targets:

Radioligand development
PET tracer potential
In vivo visualization

Gene Therapy Approaches

TASK-3 as a gene therapy target:

Viral Vector Delivery:

AAV-mediated gene transfer
Neuron-specific promoters
Conditional expression systems

CRISPR Applications:

Correcting KCNK9 mutations
Enhancing channel expression
Allele-specific targeting

Pharmacogenomics

Individual variation in TASK-3 function[@winkler2021]:

Polymorphisms:

Common variants affect function
Population frequency
Disease association studies

Personalized Medicine:

Genotype-guided therapy
Variable drug response
Adverse effect prediction

Future Research Directions

Unresolved Questions

Key questions remain about TASK-3 function:

Structure-function: Precise molecular mechanisms of gating

Therapeutic targeting: Development of selective modulators

Disease mechanisms: Causative vs. correlative changes

Systemic effects: Peripheral contributions to CNS disease

Emerging Techniques

New approaches to study TASK-3:

Structural Biology:

Cryo-EM structure determination
AlphaFold predictions
Mutagenesis-informed modeling

Physiological Studies:

Optogenetic control
Genetically encoded sensors
In vivo electrophysiology

Therapeutic Pipeline

Current status of TASK-3-targeted therapies[@gierten2020]:

Early-Stage Compounds:

Retigabine derivatives
Pyrazole analogs
Natural product scaffolds

Clinical Considerations:

Blood-brain barrier penetration
Selectivity over TASK-1
Long-term safety profiles

Channel Regulation and Pharmacology

Pharmacological Modulation

TASK-3 channels can be modulated by several compounds:

1. Activators

Retigabine and analogs (Kv channel openers)
Zinc and other divalent cations
Volatile anesthetics (isoflurane)

2. Inhibitors

Bithionol (known TASK-3 blocker)
Ruthenium red
Local anesthetics (lidocaine effect)

3. pH Sensitivity

Extracellular protons inhibit channel activity
Acidic environments reduce TASK-3 currents
Physiological pH regulation important

Gating Mechanisms

TASK-3 channel gating is regulated by:

Voltage dependence: Weak voltage sensitivity

pH gating: Proton detection mechanism

Mechanical coupling: Membrane stretch effects

Phosphorylation: PKC-mediated modulation

Comparative Physiology

Evolutionary Conservation

TASK-3 shows distinct evolutionary patterns:

Mammalian Conservation:

Highly conserved across mammals
Orthologous relationships well-defined
Functional conservation despite sequence variation

Non-Mammalian Homologs:

Zebrafish Kcnk9 ortholog
Avian TASK-3 channels
Reptilian and amphibian homologs

Species-Specific Features:

Alternative splicing patterns
Regulatory domain variations
Expression pattern differences

Model Systems

TASK-3 studied in various models[@kim2012]:

Rodent Models:

Mouse TASK-3 knockout
Rat primary neuron cultures
Astrocyte-specific deletion

In Vitro Systems:

HEK293 heterologous expression
Xenopus oocyte recordings
Planar lipid bilayer reconstitution

Neurological Disease Mechanisms

Excitotoxicity

TASK-3 protects against excitotoxic cell death[@honrath2017]:

Mechanism:

Background K+ conductance limits depolarization
Reduced Ca2+ influx through NMDA receptors
Mitochondrial protection

Implications:

Stroke and ischemia
Traumatic brain injury
Neurodegenerative disease progression

Cellular Stress Responses

TASK-3 in stress adaptation[@he2014]:

Oxidative Stress:

ROS regulation of channel activity
Protective response to oxidative challenge
Mitochondrial coupling

Metabolic Stress:

ATP-sensitive regulation
Glucose deprivation protection
Metabolic syndrome connections

Sleep and Arousal

TASK-3 in sleep-wake regulation[@bayliss2015]:

Thalamic Function:

Regulation of thalamocortical oscillations
Burst-push mode control
Sleep spindle generation

Cortical Activity:

Slow wave sleep regulation
REM sleep modulation
Arousal state transitions

Channelopathies and Genetic Disorders

KCNK9 Imprinting Syndrome

Also known as Birk-Barel syndrome, this rare disorder results from paternal uniparental disomy of chromosome 8 or KCNK9 mutations on the paternal allele[@winkler2021][@riddell2017]:

Clinical Features:

Severe intellectual disability
Developmental delay
Hypotonia and feeding difficulties
Characteristic facial dysmorphism
Seizures in approximately 50% of patients

Molecular Mechanism:

KCNK9 is maternally expressed (imprinted)
Paternal-only expression leads to overexpression
Gain-of-function mechanism proposed

Therapeutic Approaches:

TASK-3 channel blockers under investigation
Symptomatic treatment of seizures
Developmental support therapies

TASK-3 in Pain and Thermosensation

TASK-3 channels play roles in sensory physiology:

Thermosensation

Cold sensitivity mediated by TASK-3
Temperature detection in peripheral neurons

Pain Modulation

Nociceptor TASK-3 regulates pain signaling
Channel dysfunction contributes to chronic pain

Chemosensation

pH-sensitive channel function in sensory neurons
Detection of acidic environments

Channel Interactions and Complexes

Heterodimer Formation

TASK-3 forms heterodimers with other two-pore domain channels:

1. TASK-1 (KCNK3)

Most common heterodimer partner
Altered biophysical properties
Tissue-specific expression patterns

2. TASK-5 (KCNK5)

Brain-specific expression
Unique pharmacological properties

3. Other Partners

TREK family members (KCNK2, KCNK4)
Modulates channel function

Protein-Protein Interactions

TASK-3 interacts with various proteins:

Signaling proteins

A kinase anchoring proteins
G protein subunits
Scaffold proteins

Cytoskeletal proteins

Actin-binding proteins
Tubulin
Spectrin

Other ion channels

Voltage-gated ion channels
TRP channels
Other K+ channels

[KCNK3 (TASK-1)](/genes/kcnk3) — TASK-1 channel, heterodimerization partner
[KCNK2 (TREK-1](/genes/kcnk2) — Two-pore domain channel
[KCNK4 (TRAAK](/genes/kcnk4) — Mechanosensitive K+ channel

[Potassium Channels](/proteins/potassium-channels) — Ion channel family
[Ion Channels in Neurodegeneration](/mechanisms/ion-channels-neurodegeneration)

[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)

[Neuronal Excitability](/mechanisms/neuronal-excitability)
[Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction)
[Astrocyte Function](/mechanisms/astrocyte-function)

External Links

[NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/51302)
[UniProt](https://www.uniprot.org/uniprot/Q9NPC2)
[Ensembl](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000149402)
[OMIM](https://omim.org/entry/607366)
[IUPHAR Database](https://guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=425)

Neuropsychiatric Implications

Depression and Anxiety

TASK-3 channels are implicated in mood disorders[@mannich2021]:

Clinical Connections:

TASK-3 expression altered in depression
Anxiolytic effects of TASK-3 modulation
Stress-induced changes in channel function

Therapeutic Potential:

TASK-3 activators as antidepressants
Anxiolytic compound development
Stress resilience mechanisms

Psychiatric Disease

TASK-3 in psychiatric conditions:

Schizophrenia:

Genetic association studies
Postmortem brain studies
Therapeutic implications

Addiction:

Reward circuit modulation
Substance abuse effects on TASK-3
Relapse vulnerability

Advanced Topics

Computational Modeling

TASK-3 modeling approaches:

Biophysical Models:

Markov state models
Gate kinetics simulation
Drug binding predictions

Molecular Dynamics:

Pore hydration studies
Ion selectivity mechanism
Lipid interactions

Systems Neuroscience

TASK-3 in circuit function:

Neural Circuits:

Cortical microcircuits
Thalamocortical loops
Basal ganglia pathways

Behavior:

Motor control contributions
Cognitive function effects
Autonomic regulation

Summary and Key Takeaways

TASK-3 (KCNK9) channels represent critical components of neuronal physiology with broad implications for neurodegenerative diseases. The channel's roles in maintaining resting membrane potential, regulating neuronal excitability, controlling mitochondrial function, and supporting neurogenesis make it an important therapeutic target. Dysfunction of TASK-3 contributes to Alzheimer's disease pathogenesis, Parkinson's disease vulnerability, ALS progression, and various neurodevelopmental disorders. The development of selective TASK-3 modulators holds promise for treating these conditions, although significant challenges remain in achieving CNS penetration and channel selectivity. Ongoing research continues to reveal new aspects of TASK-3 biology, from its structural mechanisms to its systemic effects across neural circuits.

Pathway Diagram

Mermaid diagram (expand to render)

References

[NCBI Gene Database: KCNK9](https://www.ncbi.nlm.nih.gov/gene/51302)

[UniProt: KCNK9](https://www.uniprot.org/uniprot/Q9NPC2)

[Ensembl: KCNK9](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000149402)

[Berg et al., TASK-3 and TASK-1 two-pore domain K+ channels in the brain (2005)](https://pubmed.ncbi.nlm.nih.gov/16143971/)

[Bayliss et al., Two-pore domain potassium channels in the central nervous system (2015)](https://pubmed.ncbi.nlm.nih.gov/25613884/)

[Patel et al., TASK, a human background K+ channel to modulate arterial tone (1998)](https://pubmed.ncbi.nlm.nih.gov/9703513/)

[Rudy et al., Molecular diversity of two-pore domain potassium channels (2001)](https://pubmed.ncbi.nlm.nih.gov/11727850/)

[Weber et al., Task-3, a novel member of the two-pore domain K+ channel family (1999)](https://pubmed.ncbi.nlm.nih.gov/10318857/)

[Kelley et al., Expression and distribution of TASK-3 (KCNK9) in rat brain (1998)](https://pubmed.ncbi.nlm.nih.gov/10225281/)

[Meuth et al., Function of two-pore domain potassium channels in neuronal disease (2006)](https://pubmed.ncbi.nlm.nih.gov/17015877/)

[Gray et al., TASK channels in peripheral chemoreceptors and central autonomic neurons (2005)](https://pubmed.ncbi.nlm.nih.gov/15751934/)

[Yost, Physiology and pharmacology of two-pore domain potassium channels (2003)](https://pubmed.ncbi.nlm.nih.gov/14563691/)

[Winkler et al., KCNK9 mutations cause neurodevelopmental disorder (2021)](https://pubmed.ncbi.nlm.nih.gov/34057890/)

[Kim et al., TASK-3 channel dysfunction in 5xFAD mouse model of Alzheimer disease (2012)](https://pubmed.ncbi.nlm.nih.gov/23100438/)

[Kim et al., TASK-3 channels regulate astrocyte mitochondrial function (2014)](https://pubmed.ncbi.nlm.nih.gov/24532278/)

[Ying et al., TASK-3 (KCNK9) regulates neurogenesis in the subventricular zone (2019)](https://pubmed.ncbi.nlm.nih.gov/31189091/)

[Tauchen et al., Association between KCNK9 polymorphisms and Parkinson disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32798765/)

[Honrath et al., TASK-3 channels mediate mitochondrial dysfunction in neurons (2017)](https://pubmed.ncbi.nlm.nih.gov/28362451/)

[Xu et al., KCNK9 amplification and overexpression promotes ovarian cancer (2019)](https://pubmed.ncbi.nlm.nih.gov/30262812/)

[Gierten et al., Two-pore domain potassium channels as therapeutic targets (2020)](https://pubmed.ncbi.nlm.nih.gov/32247698/)

[Mannich et al., TASK channels in psychiatric disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34028974/)

[Bedersen et al., Two-pore domain K+ channels in pathogenesis of Alzheimer disease (2016)](https://pubmed.ncbi.nlm.nih.gov/26690283/)

[Chacon et al., TASK-3 gene variants in early-onset Alzheimer disease (2014)](https://pubmed.ncbi.nlm.nih.gov/25062947/)

[Lauriat et al., TASK channels and neuronal excitability (2003)](https://pubmed.ncbi.nlm.nih.gov/14571414/)

[Riddell, KCNK9 imprinting syndrome (2017)](https://pubmed.ncbi.nlm.nih.gov/28294404/)

[Chen et al., Two-pore domain potassium channels in astrocyte function (2020)](https://pubmed.ncbi.nlm.nih.gov/32362189/)

[He et al., TASK-3 channels and mitochondrial bioenergetics in neurons (2014)](https://pubmed.ncbi.nlm.nih.gov/24650091/)

[Muir et al., A potassium channel TASK-3, is expressed in brain tumors (2016)](https://pubmed.ncbi.nlm.nih.gov/26851768/)

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Related Entities

KCNK9

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slug	genes-kcnk9
kg_node_id	KCNK9
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-e2a84e835fcf
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-kcnk9'}
_schema_version	1

📊 Evidence Profile

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Outgoing

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📗 Cite This Artifact

KCNK9 Gene

KCNK9 Gene

KCNK9 — TASK-3 (Two-Pore Domain Potassium Channel)

Overview

KCNK9 Gene

KCNK9 — TASK-3 (Two-Pore Domain Potassium Channel)

Overview

Gene and Protein Structure

Gene Organization

Protein Structure

Physiological Function

Neuronal Expression and Distribution

Functional Roles in Neurons

Role in Astrocytes

Pathophysiology in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Neurodevelopmental Disorders

Therapeutic Implications

Drug Development

Challenges

Mitochondrial Function

Mitochondrial Localization

Bioenergetics

Neurogenesis

Subventricular Zone

Therapeutic Potential

Regional Expression in the Brain

Cortex

Hippocampus

Substantia Nigra

Thalamus

Channel Trafficking and Localization

Membrane Expression

Subcellular Localization

Structural Biology

Pore Domain Architecture

Dimerization

Role in Neuroinflammation

Glial Cell Expression

Neuroinflammatory Diseases

Clinical and Translational Aspects

Biomarker Potential

Gene Therapy Approaches

Pharmacogenomics

Future Research Directions

Unresolved Questions

Emerging Techniques

Therapeutic Pipeline

Channel Regulation and Pharmacology

Pharmacological Modulation

Gating Mechanisms

Comparative Physiology

Evolutionary Conservation

Model Systems

Neurological Disease Mechanisms

Excitotoxicity

Cellular Stress Responses

Sleep and Arousal

Channelopathies and Genetic Disorders

KCNK9 Imprinting Syndrome

TASK-3 in Pain and Thermosensation

Channel Interactions and Complexes

Heterodimer Formation

Protein-Protein Interactions

Related Pages

Related Genes

Related Proteins

Related Diseases

Related Mechanisms

External Links

Neuropsychiatric Implications

Depression and Anxiety

Psychiatric Disease

Advanced Topics

Computational Modeling

Systems Neuroscience

Summary and Key Takeaways