The IL31RA gene gives your cells instructions for part of a receptor that senses IL-31, an immune signal involved in itching and skin inflammation. This gene plays an important role in how skin cells, immune cells, and some nerve cells respond when the body is irritated. If the gene does not work as expected, that signaling may be altered, which can affect itch and skin inflammation. Some inherited variants in the IL31RA gene are linked to rare skin conditions with long lasting itchy, thickened, or darker patches.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for making proteins, which are the working parts of cells. Others mainly control when certain processes happen, where they happen, and how strongly they run. 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
IL31RAGene function
What if the gene works
The IL31RA gene helps make part of a cell surface receptor for IL-31, an immune signal. This receptor helps coordinate itch signaling and some inflammatory responses, especially in skin, nerves, and immune cells.
Risk
What if the gene does not work
Variants in the IL31RA gene can cause inherited primary localized cutaneous amyloidosis, often with persistent itching and rippled or raised darker skin patches. Milder or more severe variants may influence when symptoms begin and how extensive the skin changes are.
Treatment
What does that mean for your treatment
No IL31RA-specific treatment or management approach is currently established for people with a pathogenic or loss-of-function variant in the IL31RA gene. The IL31RA gene is a recognized drug target in itch-related skin conditions, and medicines such as nemolizumab block IL31RA signaling, but this use is not based on carrying an IL31RA variant.
Conditions associated with IL31RA
Gene function
What if the gene works
The IL31RA gene helps certain cells receive the immune messenger IL-31. This matters most in skin, immune, and sensory nerve cells, where messages need to be passed along clearly. When IL31RA is working as expected, cells can detect this signal and adjust their normal activity in an organized way.
The IL31RA gene provides instructions for part of a cell surface receiver for IL-31. With a partner protein, it allows selected cells to notice this immune message.
After IL-31 binds, the IL31RA protein sends that message inward to the cell’s control systems. This helps the cell adjust which routine instructions are active.
Many immune cells use IL31RA to respond to signals coming from nearby cells. This supports organized communication during everyday immune activity, especially at body surfaces such as the skin.
In skin cells and sensory nerves, IL31RA helps link immune signals with normal itch signaling in the skin. This is part of how the body connects skin activity with sensation.
What is a variant?
A genetic variant is a minor difference in the DNA sequence of a gene. These differences are common and help explain normal human diversity, such as variation in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or directly cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IL31RA gene can affect cell signaling by changing the receptor’s shape, stability, or ability to reach the cell surface and pair with its signaling partner. In familial primary localized cutaneous amyloidosis, milder changes may leave some signaling intact, while more severe variants can reduce signaling further and are linked to earlier or more marked skin findings.
How variants are linked to conditions
Pathogenic variants in the IL31RA gene are linked to primary localized cutaneous amyloidosis, a rare inherited skin condition. This IL31RA gene variant association is most often described in people with long-lasting itch and rippled, thickened, or darker skin patches, especially in lichen or macular amyloidosis. This is the main well-established condition tied to the IL31RA gene in human genetics.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology, and they are found throughout the general population. Most do not directly affect health and instead represent normal human variation. For many genes, having a variant associated with a condition points to a possible link, not a certain diagnosis, particularly when several genes and environmental influences also play a role. Still, there are situations in which one well understood variant in a particular gene is enough to establish the 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 health risk specifically related to the IL31RA gene. If an IL31RA change is found on testing, a doctor or genetic counselor can help explain what it may mean in the context of your personal and family history.
Inheritance of IL31RA variants
Variants in the IL31RA gene linked to inherited skin conditions are generally passed down in an autosomal dominant pattern. In practical terms, how IL31RA gene variants are inherited usually means a person needs one altered copy of the gene to have the condition, and each child of an affected parent has a 50% chance of inheriting that variant. This pattern has been described for IL31RA-related primary localized cutaneous amyloidosis, a condition that can run in families.
What does my IL31RA result mean for my family?
For some skin conditions linked to the IL31RA gene, the pattern in families is usually dominant, which means close relatives such as a parent, brother, sister, or child may also carry the same gene change. In families with a known IL31RA-related condition, relatives may have similar long-term itchy, thickened, or darker patches of skin, even if symptoms differ from one person to another. Because of that, first-degree relatives may also want to learn whether the same result is present in them.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the IL31RA gene, IL31RA genetic testing looks at your DNA from a blood or saliva sample. A lab reads the gene’s sequence and checks for changes in the code. Results can confirm a specific variant and help clarify whether it may be linked to your symptoms or family history.
When should I consider getting a genetic test?
Genetic testing for the IL31RA gene may be worth discussing if several relatives have the same long-lasting, very itchy, thickened, or rippled skin patches, especially when doctors suspect an inherited skin condition linked to protein buildup in the skin. In that setting, testing can help confirm whether IL31RA is part of the cause.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it reveals depends on the condition and the type of variant involved. Over time, many factors influence how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when viewed alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA 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, has less effect in another, or causes more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medications. By looking at the relationship between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support treatment decisions that are more informed and more individualized. If you want to learn more about this topic, more information is available in the LearnHub.
Drugs influenced by the IL31RA gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting medication response, so questions about medicines, side effects, or treatment changes are best discussed with your doctor.
History
In the early 2000s, researchers identified the IL31RA gene while mapping proteins involved in immune signaling. Soon after, IL31RA was recognized as part of the receptor for interleukin 31, a signaling molecule linked to itch and skin inflammation. This helped connect basic laboratory findings with common symptoms seen in conditions such as atopic dermatitis. From these first observations, research expanded steadily, and IL31RA became part of a growing effort to understand why some inflammatory skin conditions cause intense itching. Over time, studies in people and in the lab clarified that changes in this pathway may influence how the body senses and maintains itch.