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KCNQ3

Chr 8q24.22

potassium voltage-gated channel subfamily Q member 3

Aliases:
Kv7.3
MANE:
ENST00000388996.10

Annotations refreshed 10 hours ago.

Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Brain channelopathy

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • DDG2P

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
  • Early onset or syndromic epilepsy

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Intellectual disability

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
  • Hereditary ataxia with onset in adulthood

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Adult onset dystonia, chorea or related movement disorder

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Adult onset neurodegenerative disorder

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Childhood onset dystonia, chorea or related movement disorder

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

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Disease associations (Open Targets)

  • Benign familial neonatal seizures

    0.79
  • Seizure

    0.61
  • multiple sclerosis

    0.59
  • Lambert-Eaton myasthenic syndrome

    0.56
  • benign neonatal seizures

    0.56
  • myasthenia gravis

    0.56
  • epilepsy

    0.52
  • hereditary disease

    0.50
  • congenital myasthenic syndrome

    0.49
  • Congenital myasthenic syndromes

    0.49

Score is the Open Targets composite evidence score (0-1). Higher = stronger gene-disease association.

Protein function (UniProt)

Potassium voltage-gated channel subfamily KQT member 3

Pore-forming subunit of the voltage-gated potassium (Kv) M-channel which is responsible for the M-current, a key controller of neuronal excitability (PubMed:16319223, PubMed:27564677, PubMed:28793216, PubMed:9872318). M-channel is composed of pore-forming subunits KCNQ2 and KCNQ3 assembled as heterotetramers (PubMed:14534157, PubMed:16319223, PubMed:27564677, PubMed:9872318). The native M-current has a slowly activating and deactivating potassium conductance which plays a critical role in determining the subthreshold electrical excitability of neurons as well as the responsiveness to synaptic inputs (PubMed:14534157, PubMed:16319223, PubMed:28793216). M-channel is selectively permeable in vitro to other cations besides potassium, in decreasing order of affinity K(+) > Rb(+) > Cs(+) > Na(+) (PubMed:28793216). M-channel association with SLC5A3/SMIT1 alters channel ion selectivity, increasing Na(+) and Cs(+) permeation relative to K(+) (PubMed:28793216). Suppressed by activation of M1 muscarinic acetylcholine receptors (PubMed:10713961). KCNQ3 also associates with KCNQ5 to form a functional channel in vitro and may also contribute to the M-current in brain (PubMed:11159685)

Data sources: HGNC (CC BY 4.0), AlphaFold (CC BY 4.0, Jumper et al. Nature 2021), Genomics England PanelApp (CC BY 4.0), ClinGen, Open Targets (CC0), UniProt.

Not for sole clinical decision-making. Always verify against primary sources.