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KCNE1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

KCNE1 gene

The KCNE1 gene regulates potassium channels essential for hearing and maintaining a regular heart rhythm, with mutations linked to Jervell and Lange-Nielsen syndrome and acquired long QT syndrome.

Normal Function

The KCNE1 gene provides instructions for making a protein that regulates the activity of potassium channels. These channels transport potassium ions into and out of cells, which is vital for generating and transmitting electrical signals.

The KCNE1 protein acts as a beta subunit that binds to and regulates a channel made of four alpha subunits produced by the KCNQ1 gene. These channels are active in the inner ear and heart muscle:

  • Inner Ear: They maintain the ion balance required for normal hearing.
  • Heart: They are involved in recharging the cardiac muscle after each heartbeat to maintain a regular rhythm.

The KCNE1 protein is also produced in the kidneys, testes, and uterus, where it likely regulates other channels.

Health Conditions Related to Genetic Changes

Jervell and Lange-Nielsen syndrome

At least four mutations in the KCNE1 gene have been identified in people with Jervell and Lange-Nielsen syndrome, a condition causing profound hearing loss from birth and an abnormal heart rhythm (arrhythmia). Affected individuals typically have mutations in both copies of the gene. These mutations disrupt the protein's structure, preventing it from regulating potassium flow in the inner ear and heart.

Other disorders

Certain medications can lead to acquired long QT syndrome, a condition that increases the risk of cardiac arrest and sudden death. A small percentage of these cases occur in individuals with an underlying mutation in the KCNE1 gene.

Other Names for This Gene

  • delayed rectifier potassium channel subunit IsK
  • IKs producing slow voltage-gated potassium channel beta subunit Mink
  • ISK
  • JLNS2
  • KCNE1_HUMAN
  • LQT5
  • minimal potassium channel
  • minK
  • potassium channel, voltage gated subfamily E regulatory beta subunit 1
  • potassium voltage-gated channel, Isk-related family, member 1

Genomic Location

The KCNE1 gene is found on chromosome 21.

Frequently Asked Questions

Jervell and Lange-Nielsen syndrome (JLNS) is caused by mutations in both copies of the KCNE1 gene (or KCNQ1) and is characterized by the combination of profound congenital hearing loss and long QT syndrome. In contrast, Romano-Ward syndrome is an autosomal dominant form of long QT syndrome that does not involve hearing loss. While KCNE1 mutations are the primary cause of JLNS, they can also contribute to Romano-Ward syndrome if only one copy of the gene is affected, though KCNQ1 and KCNH2 mutations are more common in the dominant form.
The KCNE1 protein acts as a beta subunit that regulates potassium channels in the heart, specifically helping to recharge the cardiac muscle after each beat. Mutations in this gene slow down the repolarization phase of the heart's electrical cycle, which is measured as a prolonged QT interval on an ECG. This delay increases the risk of a specific type of dangerous arrhythmia called Torsades de Pointes, which can lead to fainting (syncope), cardiac arrest, or sudden death, particularly during physical exertion or emotional stress.
Management typically involves lifelong beta-blocker therapy to reduce the heart's sensitivity to adrenaline and lower the risk of arrhythmias. Patients are advised to avoid known QT-prolonging medications, which requires careful review of all prescriptions and over-the-counter drugs with a cardiologist. Lifestyle modifications include avoiding extreme physical exertion, competitive sports, and situations that cause significant emotional stress or fever, as these can trigger cardiac events. Regular monitoring with ECGs and genetic counseling for family members is also essential.
In the context of Jervell and Lange-Nielsen syndrome, the hearing loss associated with KCNE1 mutations is profound and congenital, meaning it is present from birth. The potassium channels regulated by KCNE1 are critical for the development and function of the inner ear's hair cells. Because the mutation is present from conception, the structural and functional deficits in the auditory system are established during fetal development. Therefore, individuals with this specific genetic condition do not lose hearing later in life due to the mutation; they are born with it.
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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