KCNQ1 (KV7.1)

📖 Wiki Page

gene935 wordssynced 2026-04-02

KCNQ1 Gene (KV7.1)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KCNQ1 (KV7.1)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>KCNQ1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Potassium Voltage-Gated Channel Subfamily Q Member 1</td>
</tr>
<tr>
<td class="label">Synonyms</td>
<td>Kv7.1, KCNA1, LQT1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>11p15.5</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>3785</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>607542</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000143338</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P51787</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>676 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~75 kDa</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Description</td>
</tr>
<tr>
<td class="label">Beta-blockers</td>
<td>First-line LQT1 treatment</td>
</tr>
<tr>
<td class="label">Potassium channel activators</td>
<td>Flavinoids (e.g., nicorandil)</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-KCNQ1 delivery</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/cardiac" style="color:#ef9a9a">Cardiac</a>, <a href=

...

KCNQ1 Gene (KV7.1)

Overview

Kcnq1 (Kv7.1) plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

Kcnq1 (Kv7.1) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

KCNQ1 (Potassium Voltage-Gated Channel Subfamily Q Member 1), also known as Kv7.1, is a gene encoding a voltage-gated potassium channel subunit. KCNQ1 forms homomeric or heteromeric channels that generate the slowly activating delayed rectifier potassium current (IKs). These channels are critical for cardiac repolarization and epithelial electrolyte transport.

Gene Overview

Gene Structure

The KCNQ1 gene consists of 19 exons spanning approximately 19 kb of genomic DNA on chromosome 11p15.5. This region is within the imprinted domain associated with Beckwith-Wiedemann syndrome. The gene produces multiple transcript variants through alternative splicing.

Protein Structure

KCNQ1 is a voltage-gated potassium channel with distinctive domains:

S1-S6 transmembrane segments: Core voltage-sensing and pore-forming structure
Voltage sensor domain (S1-S4): Detects membrane potential changes
Pore domain (S5-S6): Forms the potassium-selective ion conduction pathway
N-terminal domain: Interacts with KCNE subunits and regulatory proteins
C-terminal domain: Contains assembly signals and regulatory sites

The channel assembles as a tetramer, with each subunit contributing to the functional channel.

Normal Function

KCNQ1 channels perform essential functions in various tissues:

Cardiac Function

In cardiac myocytes, KCNQ1:

Generates the slowly activating delayed rectifier current (IKs)
Contributes to action potential repolarization
Prevents early afterdepolarizations
Modulates QT interval duration

Epithelial Transport

In epithelial cells, KCNQ1:

Regulates salt transport across epithelia
Controls gastric acid secretion
Modulates intestinal chloride secretion
Affects renal potassium handling

Neuronal Function

In [neurons](/entities/neurons), KCNQ1 (as Kv7.1):

Contributes to neuronal excitability
Regulates firing patterns
Modulates neurotransmitter release
May influence cognitive function

Expression Pattern

KCNQ1 exhibits broad expression:

Heart: High expression in atrial and ventricular myocytes
Inner ear: Stria vascularis for potassium recycling
Kidney: Tubular epithelial cells
Gastric mucosa: Parietal cells
Brain: Lower expression in various regions
Cerebral [cortex](/brain-regions/cortex)
[Hippocampus](/brain-regions/hippocampus)
Cerebellum

Disease Associations

Long QT Syndrome Type 1 (LQT1)

KCNQ1 mutations cause the most common form of long QT syndrome:

Inheritance: Autosomal dominant (most) or recessive (rare)
Clinical features:
Prolonged QT interval on ECG
Syncope, often triggered by exercise
Torsades de pointes
Risk of sudden cardiac death
Triggers: Swimming, exercise, sudden loud noises

Jervell and Lange-Nielsen Syndrome

Homozygous/compound heterozygous KCNQ1 mutations:

Congenital deafness
Long QT syndrome
Severe cardiac phenotype

Atrial Fibrillation

Gain-of-function mutations:

Short QT phenotype
Increased atrial excitability

Epilepsy

Rare associations with seizure disorders:

Altered neuronal excitability
May modify seizure susceptibility

Alzheimer's Disease

Potential roles:

Neuronal potassium homeostasis
Possible interaction with [Aβ](/proteins/amyloid-beta) signaling

Parkinson's Disease

May affect dopaminergic neuron function
Altered expression in PD models

Therapeutic Implications

Animal Models

Kcnq1 Knockout Mice

Embryonic lethality in complete knockout
Heterozygotes show prolonged QT
Inner ear defects

Transgenic Models

Cardiac-specific overexpression
Point mutation knock-in models

Research Directions

Developing gene therapy approaches
Understanding genotype-phenotype correlations
Identifying pharmacological chaperones
Exploring modifier genes

Overview

Background

The study of Kcnq1 (Kv7.1) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[1] Wang J, et al. (2010). "KCNQ1: Structure, function, and regulation." Journal of Molecular and Cellular Cardiology. 49(2): 203-213.

[2] Jespersen T, et al. (2005). "The KCNQ1 potassium channel: from gene to physiological function." Physiology. 20: 408-416.

[3] Hedley PL, et al. (2009). "The genetic basis of long QT and short QT syndromes." Heart Rhythm. 6(8): 1139-1149.

[4] Neyroud N, et al. (1997). "A novel mutation in the potassium channel gene KCNQ1 causes long QT syndrome." Nature Genetics. 15(2): 186-189.

[5] Brown DA, et al. (2017). "Neuronal KV7 (KCNQ) channels and their modulators as therapeutic targets." Neuropharmacology. 113: 620-633.

External Links

[KCNQ1 Gene - NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/3785)
[KCNQ1 Protein - UniProt](https://www.uniprot.org/uniprot/P51787)
[KCNQ1 - GeneCards](https://www.genecards.org/cgi-bin/carddisp.pl?gene=KCNQ1)

Pathway Diagram

The following diagram shows the key molecular relationships involving KCNQ1 (KV7.1) discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

📖 View canonical wiki page →

KCNQ1 (KV7.1)

KCNQ1 Gene (KV7.1)

KCNQ1 Gene (KV7.1)

Overview

Introduction

Gene Overview

Gene Structure

Protein Structure

Normal Function

Cardiac Function

Epithelial Transport

Neuronal Function

Expression Pattern

Disease Associations

Long QT Syndrome Type 1 (LQT1)

Jervell and Lange-Nielsen Syndrome

Atrial Fibrillation

Epilepsy

Alzheimer's Disease

Parkinson's Disease

Therapeutic Implications

Animal Models

Kcnq1 Knockout Mice

Transgenic Models

Research Directions

Overview

Background

References

See Also

External Links

Pathway Diagram