KCND2 Gene - Kv4.2 Voltage-Gated Potassium Channel

KCND2 Gene - Kv4.2 Voltage-Gated Potassium Channel

Overview

KCND2 Gene - Kv4.2 Voltage-Gated Potassium Channel

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCND2 Gene - Kv4.2 Voltage-Gated Potassium Channel</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>KCND2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Potassium Voltage-Gated Channel Subfamily D Member 2</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>Kv4.2, Shaw2</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7q31.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>8936</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>605721</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000163637</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9NZV8</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>~30 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>7</td>
</tr>
<tr>
<td class="label">Function</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">Dendritic integration</td>
<td>Attenuate EPSP summation</td>
</tr>
<tr>
<td class="label">Backpropagation</td>
<td>Control AP invasion</td>
</tr>
<tr>
<td class="label">Repetitive firing</td>
<td>Repolarize membranes</td>
</tr>
<tr>
<td class="label">Synaptic plasticity</td>
<td>Modulate LTP/LTD</td>
</tr>
<tr>
<td class="label">Resonance</td>
<td>Frequency preference</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Effect</td>
</tr>
<tr>
<td class="label">CaMKII</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">PKA</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">p38 MAPK</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">ERK</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Kv4.2 openers</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Kv4.2 blockers</td>
<td>Clinical trials</td>
</tr>
<tr>
<td class="label">Channel modulators</td>
<td>Discovery</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/epilepsy" style="color:#ef9a9a">Epilepsy</a>, <a href="/wiki/glioblastoma" style="color:#ef9a9a">Glioblastoma</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">14 edges</a></td>
</tr>
</table>

KCND2 (Potassium Voltage-Gated Channel Subfamily D Member 2) encodes the Kv4.2 subunit, a rapidly inactivating (A-type) potassium channel critical for neuronal excitability and synaptic integration [1]. This gene is located on chromosome 7q31.2 and encodes a protein of 647 amino acids. Kv4.2 channels are predominantly localized to dendritic shafts where they shape excitatory postsynaptic potentials, regulate backpropagation of action potentials, and modulate synaptic plasticity. Dysregulation of KCND2 is implicated in Alzheimer's disease, Parkinson's disease, epilepsy, and psychiatric disorders [2].

Gene Information

Protein Structure and Function

Structure

The Kv4.2 protein contains:

• Six transmembrane domains (S1-S6)
• Voltage sensor domain (S4 with positive charges)
• Pore domain (P loop between S5-S6)
• Rapid inactivation domain (N-terminal ball-and-chain)
• PSD-95 interaction motifs (PDZ binding domain)
• C-terminal regulatory domains for channel assembly

Physiological Function

Kv4.2 channels serve critical neuronal functions:

Kv4.2 channels generate the somatodendritic A-current that is crucial for dampening excitatory responses and preventing hyperexcitability [4].

Localization

KCND2 is highly expressed in:

• Hippocampus: CA1 pyramidal neuron dendrites
• Cerebral cortex: Layer II/III pyramidal neurons
• Striatum: Medium spiny neurons
• Cerebellum: Purkinje cells
• Thalamus: Relay neurons
• Olfactory bulb: Mitral/tufted cells

Role in Neurodegenerative Diseases

Alzheimer's Disease

Kv4.2 channels are affected in AD through multiple mechanisms:

Studies in APP/PS1 mice show reduced Kv4.2 expression in CA1 neurons, correlating with cognitive deficits [6].

Parkinson's Disease

In PD, Kv4.2 alterations include:

Epilepsy

Kv4.2 is strongly implicated in epilepsy:

Psychiatric Disorders

Kv4.2 dysfunction is implicated in:

Molecular Pathways

Signaling Regulation

Kv4.2 channel activity is modulated by:

Protein Interactions

Kv4.2 forms complexes with:

• KChIP proteins: Accessory subunits (KChIP1-4) that enhance trafficking and modify kinetics [10]
• DPP6/DPP10: Dipeptidyl peptidase-like proteins that increase surface expression
• PSD-95: Postsynaptic scaffolding protein that anchors Kv4.2 at synapses
• Filamin: Cytoskeletal protein for dendritic targeting

Therapeutic Implications

Drug Development

Kv4.2 channels are emerging therapeutic targets:

Research Directions

Key areas for development:

Key Publications

See Also

• [Potassium Channels in Neurodegeneration](/mechanisms/potassium-channels)
• [A-Type Potassium Channels](/mechanisms/a-type-potassium-channels)
• [Ion Channelopathies](/diseases/ion-channelopathies)
• [Dendritic Integration Mechanisms](/mechanisms/dendritic-integration)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [NCBI Gene: KCND2](https://www.ncbi.nlm.nih.gov/gene/8936)
• [UniProt: KCND2](https://www.uniprot.org/uniprot/Q9NZV8)
• [IUPHAR Database: Kv channels](https://www.guidetopharmacology.org/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving KCND2 Gene - Kv4.2 Voltage-Gated Potassium Channel discovered through SciDEX knowledge graph analysis: