KCNV2 (Potassium Voltage-Gated Channel Modifier Subfamily V Member 2) encodes a regulatory subunit of voltage-gated potassium channels. This protein modulates channel function by altering gating properties and surface expression. Pathogenic variants in KCNV2 cause autosomal recessive cone dystrophy and night blindness (RCD), a retinal disorder characterized by progressive loss of cone and rod photoreceptor function. [@voltagegated2020]
Gene Information
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | KCNV2 | | Gene Name | Potassium Voltage-Gated Channel Modifier Subfamily V Member 2 | | Chromosomal Location | 9p24.2 | | NCBI Gene ID | [169165](https://www.ncbi.nlm.nih.gov/gene/169165) | | OMIM | [607355](https://www.omim.org/entry/607355) | | UniProt | [Q9EQB4](https://www.uniprot.org/uniprot/Q9EQB4) | | Ensembl ID | ENSG00000168243 | | Aliases | KV Channel-Interacting Protein KCNIP2 |
</div>
Function
KCNV2 encodes a voltage-gated potassium channel regulatory subunit that modulates the function of diverse potassium channel complexes. KCNV2 belongs to the KCNIP (K+ channel interacting protein) family, which do not form functional channels alone but assemble with Kv channel alpha subunits to create modulatory subunits.
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title: KCNV2 Gene
KCNV2 Gene
Overview
KCNV2 (Potassium Voltage-Gated Channel Modifier Subfamily V Member 2) encodes a regulatory subunit of voltage-gated potassium channels. This protein modulates channel function by altering gating properties and surface expression. Pathogenic variants in KCNV2 cause autosomal recessive cone dystrophy and night blindness (RCD), a retinal disorder characterized by progressive loss of cone and rod photoreceptor function. [@voltagegated2020]
Gene Information
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | KCNV2 | | Gene Name | Potassium Voltage-Gated Channel Modifier Subfamily V Member 2 | | Chromosomal Location | 9p24.2 | | NCBI Gene ID | [169165](https://www.ncbi.nlm.nih.gov/gene/169165) | | OMIM | [607355](https://www.omim.org/entry/607355) | | UniProt | [Q9EQB4](https://www.uniprot.org/uniprot/Q9EQB4) | | Ensembl ID | ENSG00000168243 | | Aliases | KV Channel-Interacting Protein KCNIP2 |
</div>
Function
KCNV2 encodes a voltage-gated potassium channel regulatory subunit that modulates the function of diverse potassium channel complexes. KCNV2 belongs to the KCNIP (K+ channel interacting protein) family, which do not form functional channels alone but assemble with Kv channel alpha subunits to create modulatory subunits.
Key functions include:
Channel modulation: KCNV2 alters voltage-dependence and kinetics of Kv channel gating
Surface expression: Facilitates proper trafficking and membrane localization of channel complexes
Retinal function: Critical for normal photoreceptor electrophysiology and survival
Neural excitability: Modulates neuronal firing patterns in various brain regions
In the retina, KCNV2 co-assembles with Kv8.2 (KCNV1) to form native channels in cone and rod photoreceptors. These channels help set the resting membrane potential and regulate the dark current essential for phototransduction.
Disease Associations
Pathogenic variants in KCNV2 cause:
Cone Dystrophy with Supernormal Rod Response (CDSRR): Also known as RCD3, this autosomal recessive disorder features cone photoreceptor degeneration followed by rod dysfunction. Patients present with photophobia, decreased visual acuity, and color vision defects in childhood, progressing to night blindness [1].
Night Blindness (Congenital Stationary): KCNV2 mutations can cause non-progressive night blindness without cone dystrophy in some cases [2].
Retinal degeneration: Loss of KCNV2 function leads to photoreceptor degeneration through mechanisms including calcium dysregulation and metabolic stress.
Expression
KCNV2 is expressed in:
Retina: High expression in cone and rod photoreceptors of the outer nuclear layer
Brain: Moderate expression in various brain regions including [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), and cerebellum
Other tissues: Lower expression in heart, skeletal muscle, and other organs
In the brain, KCNV2-containing channels regulate neuronal excitability and may play roles in synaptic integration and action potential repolarization.
Key Publications
[KCNV2 mutations cause cone dystrophy with supernormal rod response (Wu et al., 2007)](https://pubmed.ncbi.nlm.nih.gov/17646656/)
[Phenotypic variation in KCNV2-related retinal dystrophy (Knomoto et al., 2019)](https://pubmed.ncbi.nlm.nih.gov/31142295/)
[Wu et al., KCNV2 mutations cause cone dystrophy with supernormal rod response, Am J Hum Genet (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/17646656/)
[Knomoto et al., Phenotypic variation in KCNV2-related retinal dystrophy, Ophthalmology (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31142295/)
[Retinal channelopathies and neurodegeneration (Karn et al., 2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34158912/)
[Voltage-gated potassium channels in the retina (Michele et al., 2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32088765/)