The PRRT2 gene helps nerve cells pass signals in a controlled way, especially in brain networks involved in movement. Your cells depend on this gene when they need to keep communication between nerve cells steady. If it does not work properly, people may have brief movement attacks, seizures in infancy, or both. Some with PRRT2 variants also have episodes of poor balance or migraine, and symptoms can vary a lot even within one family.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the code for proteins, which are the parts of cells that do much of the work. Others mainly direct when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence your response to food, stress, and medications. More detail is available in the LearnHub.
Overview
PRRT2Gene function
What if the gene works
The PRRT2 gene helps nerve cells in the brain send signals in a controlled way. Its protein supports communication at synapses, the contact points between nerve cells, and helps regulate the release of chemical messengers.
Risk
What if the gene does not work
Milder to more severe variants in the PRRT2 gene can cause brief movement attacks, infant seizures, and sometimes migraine or episodic balance problems; symptoms often start early and vary widely in timing and severity.
Treatment
What does that mean for your treatment
For PRRT2-related episodic movement symptoms, low-dose carbamazepine or oxcarbazepine is often used first because many people improve markedly. If seizures are present, standard antiseizure medicines can help, and treatment is guided by the person’s symptoms rather than a PRRT2-specific drug. No targeted PRRT2 treatment is currently established.
Conditions associated with PRRT2
Gene function
What if the gene works
This gene is most active in the brain, where nerve cells need split second timing. The PRRT2 gene helps nerve cells communicate by controlling how chemical messages are released. Its protein sits near the nerve ending and supports smooth, coordinated signaling during everyday movement and brain activity.
The PRRT2 gene helps nerve endings release chemical messages at the right moment. Its protein works close to the release machinery, helping signals pass clearly from one nerve cell to the next.
This gene supports rapid, well-timed communication in brain circuits. That timing matters for actions such as starting a movement, reacting quickly, and coordinating muscle activity.
The PRRT2 gene also interacts with sodium channels (protein gates that help start electrical signals) on nerve cells. This helps brain cells fire in a controlled, steady pattern.
What is a variant?
A genetic variant is a minor change in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect natural genetic variation. In some situations, though, a variant can change how a gene works more substantially and may contribute to or directly cause a genetic condition.
Genetic variants
What if the gene does not work
A key point in understanding how PRRT2 gene variants affect nerve signaling is that many changes shorten the protein early or reduce how much of it reaches the nerve cell membrane. This can weaken its interactions with the machinery that controls neurotransmitter release between nerve cells. Some variants leave partial activity, while more severe variants can lead to little or no working protein. That functional range may help explain why symptoms can vary in timing and intensity from person to person.
How variants are linked to conditions
Pathogenic variants in the PRRT2 gene most often cause paroxysmal kinesigenic dyskinesia, a condition with brief movement episodes triggered by sudden motion. They also cause self-limited familial infantile epilepsy, with seizures that usually begin in infancy, and can cause infantile convulsions with choreoathetosis, sometimes called ICCA syndrome. In some families, PRRT2 gene variants have also been linked to episodic ataxia or migraine, but these links are less common.
A variant is not necessarily a diagnosis
Genetic variants are a common and normal aspect of human biology. They are found throughout the general population. Most variants do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some cases, though, a single well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For people with a disease-causing change in the PRRT2 gene, the chance of developing related symptoms is mostly set by the gene change itself, although symptoms can vary a lot from one person to another. In some, attacks are more likely with sudden movement, stress, or too little sleep, but there is not enough evidence to say these factors change the underlying genetic risk.
Inheritance of PRRT2 variants
PRRT2-related conditions are usually inherited in an autosomal dominant pattern, which explains how PRRT2 variants are inherited in many families. This means a parent carrying a disease-causing variant in the PRRT2 gene can pass it to a child with a 50% chance in each pregnancy. Some people who inherit the variant have clear symptoms, while others have few or none, so the pattern can look less obvious across generations. New, de novo variants can also happen, meaning the change starts in the child and was not inherited from either parent.
What does my PRRT2 result mean for my family?
For PRRT2, the main family pattern is dominant, which means close relatives such as a parent, brother, sister, or child may also carry the same change and could have seizures, sudden movement episodes, migraines, or no symptoms at all. Each child of someone with a disease-causing PRRT2 change has a 1 in 2 chance of inheriting it. Some PRRT2 changes happen for the first time in one person, so a parent is not always the source.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the PRRT2 gene uses a blood sample or cheek swab. Many people have genetic testing for PRRT2 variants through a seizure or movement symptom panel, or through broader exome testing. A lab reads the gene's DNA code and reports whether a variant known to explain symptoms is present.
When should I consider getting a genetic test?
Genetic testing for the PRRT2 gene may be worth considering if a child has seizures that start in infancy, brief movement attacks triggered by sudden motion, or a family history of these episodes. A PRRT2 result can help confirm the cause and support family planning discussions.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most helpful when considered with other parts of care. In other situations, a genetic result may give a clear answer. In areas such as medication response, genetic results can help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same treatment works well for one person, does less for another, or causes more side effects in someone else. These differences are common and are one of several factors, along with age, liver and kidney function, and other medicines, that shape medication response.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. By looking at connections between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body handles it. This information can support more informed, more personalized treatment decisions. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the PRRT2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or adjusted, so any concerns about symptoms, treatment, or medication side effects are best discussed with your doctor.
History
Families and communities once noticed patterns of brief infant seizures or sudden movement episodes that seemed to run through generations, long before the cause was clear. For years, doctors described these conditions separately, including benign familial infantile epilepsy and paroxysmal kinesigenic dyskinesia, and later recognized that some families had both. In 2011 and 2012, researchers linked many of these inherited cases to variants in the PRRT2 gene, which helped connect what had looked like different conditions. Building on this early work, scientists also tied the PRRT2 gene to the syndrome known as infantile convulsions with choreoathetosis. This discovery gave many families a clearer genetic explanation and sharpened diagnosis.