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CHRNB2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

CHRNB2 gene

The CHRNB2 gene provides instructions for the β2 subunit of nicotinic acetylcholine receptors, which are essential for brain signaling and are associated with sleep-related epilepsy.

Normal Function

The CHRNB2 gene provides instructions for making one part (subunit) of a larger protein complex called a nicotinic acetylcholine receptor (nAChR). Each nAChR complex is made up of a combination of five subunits, usually two alpha (α) and three beta (β) subunits. Many different combinations are possible, and the characteristics of each nAChR complex depend on its specific subunits. In the brain, the complex most commonly consists of two α4 subunits and three β2 subunits. The CHRNB2 gene is responsible for producing the β2 subunit.

In the brain, nAChR proteins are widely distributed and play an important role in chemical signaling between nerve cells (neurons). The nAChR acts as a channel, allowing charged atoms (ions), including calcium, sodium, and potassium, to cross the cell membrane. These channels open when they attach to a chemical messenger (neurotransmitter) called acetylcholine. The channels also open in response to nicotine, the addictive substance in tobacco.

Communication between neurons depends on neurotransmitters, which are released from one neuron and taken up by neighboring neurons. The release and uptake of these chemicals are tightly regulated to ensure that signals are passed efficiently and accurately between neurons. Researchers believe that nAChR channels play an important role in controlling the normal release and uptake of neurotransmitters.

A wide range of brain functions depend on nAChR channels, including sleep and arousal, fatigue, anxiety, attention, pain perception, and memory. The channels are also active before birth, which suggests that they are involved in early brain development.

Health Conditions Related to Genetic Changes

Autosomal dominant sleep-related hypermotor epilepsy

MedlinePlus Genetics provides information about autosomal dominant sleep-related hypermotor epilepsy.

Other Names for This Gene

  • acetylcholine receptor, neuronal nicotinic, beta-2 subunit
  • cholinergic receptor, nicotinic beta 2
  • cholinergic receptor, nicotinic, beta 2 (neuronal)
  • cholinergic receptor, nicotinic, beta polypeptide 2 (neuronal)
  • EFNL3
  • nAChRB2

Frequently Asked Questions

Sleep-related epilepsy linked to the CHRNB2 gene is characterized by seizures that primarily occur during sleep, often shortly after falling asleep or just before waking. Symptoms can vary but commonly include sudden awakenings, vocalizations (cries, moans), stiffening or jerking movements of the body, and sometimes complex behaviors like thrashing or bicycling movements of the legs. The individual may not remember the seizure upon waking.
Diagnosis typically involves a detailed medical history, including descriptions of seizure events, especially if witnessed by others. An electroencephalogram (EEG), particularly a sleep EEG or video-EEG monitoring, is crucial to capture seizure activity during sleep. Genetic testing for mutations in the CHRNB2 gene can confirm the diagnosis and identify the specific genetic cause.
Since the CHRNB2 gene produces a subunit of nicotinic acetylcholine receptors (nAChRs) that respond to nicotine, individuals with CHRNB2 variants may have altered sensitivity to nicotine. While direct clinical guidelines are still evolving, it is generally advisable for individuals with CHRNB2-related epilepsy to avoid nicotine exposure (e.g., smoking, vaping) as it could potentially influence neuronal activity and seizure thresholds, though more research is needed to fully understand this interaction.
Yes, sleep-related epilepsy associated with CHRNB2 gene mutations is typically an inherited condition. It is often inherited in an autosomal dominant pattern, meaning that inheriting just one copy of the altered gene from a parent is sufficient to cause the disorder. This implies that if one parent has the condition, there is a 50% chance their child will also inherit the altered gene and be affected.
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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