<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCNK4 Gene</th>
</tr>
<tr>
<td class="label">HGNC symbol</td>
<td>KCNK4</td>
</tr>
<tr>
<td class="label">Encoded channel</td>
<td>TRAAK (K2P4.1)</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td>3778</td>
</tr>
<tr>
<td class="label">Genomic locus</td>
<td>11q13.1</td>
</tr>
<tr>
<td class="label">Channel class</td>
<td>K2P leak/mechanosensitive potassium channel</td>
</tr>
<tr>
<td class="label">Dimension</td>
<td>Appraisal</td>
</tr>
<tr>
<td class="label">Structural/channel biophysics</td>
<td>Strong</td>
</tr>
<tr>
<td class="label">Human neurodegeneration genetics</td>
<td>Limited</td>
</tr>
<tr>
<td class="label">Mechanistic plausibility in degeneration</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Drug-development readiness</td>
<td>Emerging</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
KCNK4 encodes TRAAK (TWIK-related arachidonic acid-stimulated K+ channel), a two-pore-domain potassium (K2P) channel that behaves as a mechanosensitive background conductance in [neurons](/entities/neurons).[@brohawn2012][@enyedi2010] Unlike classical voltage-gated potassium channels, TRAAK is constitutively active over physiologic voltages and is strongly modulated by membrane tension, lipid composition, and polyunsaturated fatty acids.[@brohawn2012][@nol2011] This makes KCNK4 a key interface between biomechanical stress and membrane excitability.
In neurodegeneration-relevant terms, KCNK4 is a homeostatic excitability regulator. By stabilizing resting potential and limiting overfiring in mechanically stressed or metabolically compromised neurons, TRAAK biology intersects with mechanisms such as [oxidative stress](/entities/reactive-oxygen-species), axonal injury, and vulnerable long-projection systems seen across atypical parkinsonism and dementia syndromes.[@enyedi2010][@honor2007]
TRAAK channels are dimeric proteins with each subunit contributing two pore domains (P1 and P2) and four transmembrane segments. Their gating is strongly coupled to the lipid bilayer: stretch, curvature, and pressure can increase open probability without a canonical cytosolic second messenger cascade.[@brohawn2012][@enyedi2010]
TRAAK channels translate membrane force into K+ current, generating rapid hyperpolarizing feedback in neurons experiencing deformation, shear, or stretch.[@brohawn2012][@nol2011] This mechanism is especially relevant in axons and peripheral sensory pathways but also applies to central white-matter tracts that sustain chronic mechanical stress during neurodegenerative progression.[@enyedi2010][@honor2007]
As a background conductance, TRAAK lowers input resistance and raises the threshold for repetitive firing.[@enyedi2010] In vulnerable networks, this can reduce calcium overload and excitotoxic liability, two core processes in multiple neurodegenerative mechanisms.[@honor2007][@patel2001]
Because KCNK4 responds to membrane lipid state, inflammatory lipid remodeling and mitochondrial dysfunction can indirectly alter TRAAK behavior.[@enyedi2010][@patel2001] This provides a plausible bridge between systemic metabolic stress and local circuit instability.
Direct Mendelian neurodegeneration syndromes driven by KCNK4 are uncommon, but mechanistic relevance is substantial:
For this reason, KCNK4 is best prioritized as a modifier and therapeutic target candidate rather than a disease-defining mutation locus.
Sources: [GTEx Portal v10](https://gtexportal.org/home/gene/kcnk4) | [Allen Brain Atlas](https://www.brain-map.org/)
| Rank | Tissue | Median TPM |
|------|--------|------------|
| 1 | Brain Nucleus accumbens basal ganglia | 14.05 |
| 2 | Brain Frontal Cortex BA9 | 11.75 |
| 3 | Brain Cortex | 11.61 |
| 4 | Brain Anterior cingulate cortex BA24 | 10.34 |
| 5 | Brain Hippocampus | 9.83 |
| 6 | Brain Amygdala | 9.00 |
| 7 | Brain Caudate basal ganglia | 8.76 |
| 8 | Brain Putamen basal ganglia | 5.36 |
| 9 | Brain Cerebellar Hemisphere | 5.04 |
| 10 | Brain Cerebellum | 5.01 |
| 11 | Brain Hypothalamus | 3.49 |
| 12 | Brain Substantia nigra | 1.13 |
| 13 | Testis | 0.71 |
| 14 | Cervix Endocervix | 0.36 |
| 15 | Brain Spinal cord cervical c-1 | 0.34 |
Brain-Region Expression:
| Region | Median TPM |
|--------|------------|
| Brain Nucleus accumbens basal ganglia | 14.05 |
| Brain Frontal Cortex BA9 | 11.75 |
| Brain Cortex | 11.61 |
| Brain Anterior cingulate cortex BA24 | 10.34 |
| Brain Hippocampus | 9.83 |
| Brain Amygdala | 9.00 |
| Brain Caudate basal ganglia | 8.76 |
| Brain Putamen basal ganglia | 5.36 |