The NRG1 gene gives instructions for a signaling protein that helps brain, nerve, and heart cells grow, connect, and communicate. If it does not work properly, cell communication and development can be disrupted, which may contribute to nerve, developmental, or heart problems depending on the variant. This gene plays an important role in helping nerves form myelin, the insulating covering that supports steady nerve signals. Some variants in the NRG1 gene are being studied for links to brain development and mental health, while many have little or no effect.
What is a gene?
A gene is a stretch of DNA that holds information cells use to make molecules or regulate activities in the body. Certain genes provide the instructions for proteins, which are the parts of cells that do much of the work. Other genes are mainly involved in controlling when particular processes happen, where they take place, and how active they are. Taken together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
NRG1Gene function
What if the gene works
The NRG1 gene helps cells send growth and survival signals. It supports brain and nerve development, helps nerves keep their protective covering, and plays a role in heart development and function.
Risk
What if the gene does not work
Milder to more severe variants in the NRG1 gene can reduce or alter neuregulin 1 signaling. This may change how cells send growth and survival messages, including those involved in nerve insulation and connections between nerve cells.
Treatment
What does that mean for your treatment
No NRG1-specific treatment or management approach is currently established for people with a pathogenic or loss-of-function variant in the NRG1 gene. Separate from inherited loss-of-function variants, NRG1 gene fusions in some cancers can guide targeted treatment, including HER2/HER3-directed therapy such as zenocutuzumab in approved settings.
Gene function
What if the gene works
Many day-to-day body functions depend on cells passing clear signals to one another. The NRG1 gene helps make one of these signals, especially in the nervous system. This helps explain how the NRG1 gene supports nerve cell communication and healthy nerve coverings.
NRG1 helps cells send short-range signals to nearby cells. Its protein attaches to receiver proteins on the cell surface and gives instructions that support growth and specialization.
During development, NRG1 helps guide how nerve cells and nearby support cells mature. This keeps the nervous system organized so messages can travel along the right pathways.
NRG1 helps Schwann cells build myelin (the fatty covering around many nerves). This coating lets electrical signals move along nerves more smoothly and supports movement and sensation.
In the brain, NRG1 supports the formation and tuning of synapses (the contact points between nerve cells). This helps messages pass in a balanced, coordinated way.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can more substantially change how a gene works and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NRG1 gene can change how much neuregulin 1 is made, how the gene’s message is pieced together, or how well the protein is cut and released for cell-to-cell signaling. Some NRG1 gene variants affect the part that attaches to ERBB receptors, which can weaken signaling between cells. Milder variants may slightly shift protein amount or form, while more severe variants, including some truncating changes, can greatly reduce signaling from the affected copy.
How variants are linked to conditions
Right now, the NRG1 gene does not yet have a broadly confirmed link to one specific inherited health condition, even though researchers continue to study possible connections between NRG1 gene variants and health conditions. This picture may become clearer as research develops. If you have a confirmed NRG1-related finding on genetic testing, your doctor or genetic counselor can explain what it may mean for you and your family.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in the general population. Most do not directly affect health and instead reflect normal human variation. For many genes, having a variant associated with a condition suggests a possible link rather than a definitive diagnosis, especially when multiple genes and environmental factors also play a role. In some situations, though, a single well-characterized variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce risk related to the NRG1 gene itself. For many living with an NRG1 change, any health effects depend on the exact change and often on many other genes and life factors, so a doctor or genetic counselor can help put personal risk in context.
Inheritance of NRG1 variants
There is not yet a broadly confirmed Mendelian pattern for how variants of the NRG1 gene are inherited in relation to a specific inherited condition. Current evidence suggests that how variants of the NRG1 gene are inherited may differ depending on the finding and the health context, rather than following one clearly established dominant or recessive pattern. The NRG1 gene is located on chromosome 8, which is an autosome, so a person inherits one copy from each parent. In practical terms, discussions about how NRG1 gene variants are inherited usually need to be tailored to the exact variant and the condition being evaluated.
What does my NRG1 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for NRG1, though this understanding can change as research develops. If you have a specific NRG1 result and questions about what it could mean for your family, a doctor or genetic counselor can explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the NRG1 gene, doctors use NRG1 genetic testing on a blood sample, saliva sample, or cheek swab. A lab reads the DNA sequence and checks for changes in the NRG1 gene. Results may show no relevant variant, a known variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
There is not yet a broadly established, NRG1-specific clinical reason for genetic testing in routine care. Testing decisions are usually based on your personal health history, family history, and the advice of a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic findings can offer meaningful insight, but what they tell you depends on the condition and on the type of variant involved. Over time, the body is also shaped by factors such as lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result may provide a clear answer. In areas such as medication response, genetic results can help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same treatment works well for one person, has less effect in another, or causes more side effects in someone else. Part of the difference comes from how each body breaks down, transports, or responds to a drug, and inherited gene changes are one common reason for that variation.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences can shape the way a person responds to medication. It examines connections between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes affect both how strongly a drug works and how the body processes it. This information can help support treatment decisions that are more informed and more individualized. To explore this topic in greater detail, you can learn more in the LearnHub.
Drugs influenced by the NRG1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicines, so general questions about side effects, new symptoms, or how a treatment is working are best discussed with your doctor. NRG1 has been studied in research on response to some mental health medicines, but those findings are not used routinely to make treatment decisions.
History
The NRG1 gene emerged in the 1990s from several lines of research, when scientists studying nerve growth and cell signaling realized they were describing related molecules under different names, including neuregulin and heregulin. In recent decades, awareness of this gene’s role has grown as those separate findings were brought together under one gene family. This unifying step helped researchers connect work in brain development, heart formation, and cancer biology. Building on this early work, scientists also began examining whether variants in the NRG1 gene might influence the chance of certain complex conditions, especially schizophrenia. Over time, descriptions became more precise, and NRG1 became an important example of how one gene can shape several areas of medical research.