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KCNQ1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

KCNQ1 gene

The KCNQ1 gene is critical for maintaining electrical stability in the heart and proper ion balance in the inner ear.

Normal Function

The KCNQ1 gene provides instructions for making potassium channels that transport potassium ions out of cells. These channels are vital for generating and transmitting electrical signals. They are primarily found in the heart, where they help recharge the cardiac muscle after each beat, and in the inner ear, where they maintain the ion balance necessary for hearing.

The KCNQ1 protein forms functional channels by interacting with proteins in the KCNE family, which regulate the channel's activity.

Health Conditions Related to Genetic Changes

Jervell and Lange-Nielsen syndrome

Caused by mutations in both copies of the KCNQ1 gene, this condition results in profound hearing loss from birth and serious heart rhythm abnormalities (arrhythmia). The mutations typically lead to a nonfunctional protein, preventing the formation of necessary potassium channels.

Romano-Ward syndrome

This is a form of long QT syndrome, where the heart takes longer than usual to recharge between beats. It is usually caused by a mutation in only one copy of the KCNQ1 gene. These mutations reduce the channel's ability to transport potassium, which alters electrical signaling and increases the risk of fainting or sudden death.

Short QT syndrome

In contrast to long QT syndrome, these mutations increase the activity of the potassium channels, causing the heart to recharge too quickly. This also leads to an irregular heart rhythm and an increased risk of sudden death.

Familial atrial fibrillation

Mutations in the KCNQ1 gene can cause uncoordinated electrical activity in the heart's upper chambers (atria), known as atrial fibrillation.

Other disorders

KCNQ1 mutations have been associated with Sudden Infant Death Syndrome (SIDS) and acquired long QT syndrome, a condition where certain medications trigger heart rhythm abnormalities in individuals with underlying genetic variations.

Genomic Location

The KCNQ1 gene is found on chromosome 11.

Frequently Asked Questions

Key warning signs include sudden fainting (syncope), unexplained seizures, or heart palpitations (a feeling of a racing or fluttering heart). These symptoms, especially during physical activity or emotional stress, can indicate a dangerous arrhythmia and require immediate medical evaluation.
Individuals should avoid medications known to prolong the QT interval, which can worsen their condition. Strenuous exercise or competitive sports may need to be limited or avoided, depending on the specific diagnosis and severity. Managing stress, ensuring adequate hydration, and regular follow-up with a cardiologist are also crucial.
Jervell and Lange-Nielsen syndrome is caused by mutations in both copies of the KCNQ1 gene, leading to profound hearing loss from birth in addition to severe heart rhythm abnormalities. Romano-Ward syndrome, caused by a mutation in only one copy, primarily affects the heart rhythm without hearing loss. This distinction is vital because Jervell and Lange-Nielsen syndrome requires management for both cardiac and auditory issues, often including cochlear implants, while Romano-Ward syndrome focuses solely on cardiac management.
When a KCNQ1 mutation is identified, genetic counseling is essential for the entire family. First-degree relatives (parents, siblings, children) should be offered genetic testing to determine if they also carry the mutation, even if they show no symptoms. This "cascade screening" helps identify at-risk individuals who may need cardiac monitoring or preventive treatment.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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