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HCN4 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

HCN4 gene

The HCN4 gene provides instructions for a channel that transports ions into heart muscle cells, playing a vital role in maintaining a regular heartbeat.

Normal Function

The HCN4 gene provides instructions for making a channel that transports positively charged atoms (ions) into heart muscle cells. This channel is located primarily in the sino-atrial (SA) node, an area of specialized cells that functions as the heart's natural pacemaker.

The HCN4 channel allows potassium and sodium ions to flow into cells of the SA node. This ion flow, often called the "pacemaker current," generates the electrical impulses that start each heartbeat and is essential for maintaining a regular heart rhythm.

Health Conditions Related to Genetic Changes

Sick sinus syndrome

Mutations in the HCN4 gene have been identified in people with sick sinus syndrome, a heart condition that affects the function of the SA node. These mutations generally reduce the overall flow of ions into the cells of the SA node, which prevents the node from effectively creating the electrical signals that control the heartbeat.

Consequences of these mutations include:

  • An abnormally slow heartbeat (bradycardia).
  • Dizziness and light-headedness.
  • Fainting (syncope).
  • Asymptomatic bradycardia (a slow heartbeat without other symptoms).

Other Names for This Gene

  • HCN4_HUMAN
  • hyperpolarization activated cyclic nucleotide-gated cation channel 4
  • hyperpolarization activated cyclic nucleotide-gated potassium channel 4
  • potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4
  • SSS2

Frequently Asked Questions

pacemaker is considered when symptomatic bradycardia (syncope, heart failure symptoms) or significant pauses (>3 seconds) are documented. In asymptomatic patients with mild bradycardia, observation and medication adjustments (e.g., avoiding beta‑blockers) may suffice.
Yes. Limiting caffeine, alcohol, and stimulants can reduce sympathetic stimulation that may exacerbate pauses. Regular moderate exercise, adequate hydration, and avoiding sudden position changes can help maintain stable heart rates. Patients should discuss individualized plans with their cardiologist.
Symptoms such as unexplained dizziness, fainting spells, or a resting heart rate below 50 beats per minute, especially if accompanied by palpitations or syncope, warrant evaluation. A Holter monitor or event recorder can document bradycardia or pauses that suggest SA node dysfunction.
Genetic testing via a cardiac arrhythmia panel can detect pathogenic HCN4 variants. If a mutation is found, first‑degree relatives should be offered testing, as the condition is autosomal dominant. A positive result may necessitate baseline ECGs and monitoring for bradycardia.
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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