The IL31 gene helps immune cells send signals that can trigger itch and guide inflammation, especially in the skin. If the IL31 gene does not work normally, or if its signaling is too active, people may have stronger itching and skin inflammation, which is why it is often studied in conditions such as atopic dermatitis. Most variants in this gene have little effect, but some may influence how strongly the body reacts to irritation or allergens.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or direct processes in the body. Some genes hold the information needed to produce proteins, the parts of cells that do much of the work. Others mainly control when certain processes happen, where they happen, and how strongly they are turned on. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. To go deeper into this topic, you can find more in the LearnHub.
Overview
IL31Gene function
What if the gene works
The IL31 gene helps immune cells send signals that influence itching and inflammation, especially in the skin. It supports communication between the immune system, skin, and nearby nerves.
Risk
What if the gene does not work
Changes in the IL31 gene can reduce or alter IL-31 signaling between immune cells and nearby nerve or tissue cells. Milder variants may partly change this signal, while more severe variants can disrupt how inflammatory messages are sent and received.
Treatment
What does that mean for your treatment
No IL31-specific treatment or management approach is currently established for people with a pathogenic or loss-of-function variant in the IL31 gene. The IL31 signaling pathway is an active drug target in chronic itch and inflammatory skin conditions, but current use is not guided by IL31 variant status.
Gene function
What if the gene works
The IL31 gene helps immune cells send messages to other cells, especially near the skin. It is part of the body’s normal communication system during immune responses. Understanding what the IL31 gene does in the immune system and skin helps explain how your body coordinates surface defense.
The IL31 gene lets activated immune cells release a messenger protein that alerts nearby cells. This helps coordinate local immune activity in a controlled, organized way.
Its protein carries immune signals to skin cells, linking the body’s defenses with the skin surface. This supports everyday barrier responses when your skin meets the outside world.
Signals from the IL31 gene can also reach nearby sensory nerves, which help the body notice skin irritation. This connects immune activity with normal body awareness at the skin.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IL31 gene can alter how much IL-31 a cell makes, how well the protein is released, or how strongly it binds to receptor partners on nearby cells. This helps explain how variants in the IL31 gene affect cell signaling. Milder variants may slightly shift gene activity, while more severe variants can more clearly weaken protein shape, stability, or receptor interaction.
How variants are linked to conditions
Current evidence on how IL31 gene variants are linked to conditions is still developing. The IL31 gene does not yet have a broadly confirmed link to one specific health condition across medical genetics, although research continues to explore possible associations. Anyone with a confirmed IL31-related diagnosis should use advice from their doctor or genetic counselor to interpret results in the context of their own health.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect natural human diversity. In many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, though, one well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce risk related to the IL31 gene itself. Some IL31 changes have been linked with a tendency toward itch or allergic skin inflammation in some studies, but overall risk still depends on many other genes and everyday factors.
Inheritance of IL31 variants
There is not yet a broadly confirmed Mendelian inheritance pattern tied to a specific IL31-related condition, so IL31 gene inheritance is not described as clearly autosomal dominant, autosomal recessive, or X-linked. Changes near or in the IL31 gene have mainly been studied as risk-influencing factors rather than as a single-gene cause of a well-defined inherited condition. The IL31 gene is located on chromosome 12, which is an autosome, so each person inherits one copy from each parent.
What does my IL31 result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific inherited condition for IL31. If you have an IL31 result and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your exact result and family history.
Genetic information
Genetic testing
How you find out about variants
To find out about changes in the IL31 gene, a lab can do genetic testing for IL31 variants using a blood sample, saliva, or a cheek swab. The test reads the DNA code and looks for specific variants or scans the gene more broadly. Results can show whether a variant is present, but they do not by themselves predict symptoms.
When should I consider getting a genetic test?
There is not yet a broadly established, IL31-specific clinical reason for genetic testing in routine care. Testing decisions are usually based on your symptoms and personal or family history, together with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic results can be informative, but what they can tell you varies with the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, these results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person but not as well for another. These differences are common and can influence both benefit and the chance of side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect a person’s response to medications. It studies relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This information can support more informed and more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the IL31 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so general concerns about symptoms, side effects, or treatment response are best discussed with your doctor.
History
In 2004, researchers identified the IL31 gene while studying signaling proteins made by activated immune cells. At first, interest centered on how this newly described gene fit into broader immune research. From these first observations, research expanded steadily. Over the next several years, studies linked IL31 more closely to itch and inflammatory skin conditions, especially atopic dermatitis. That shift made IL31 part of a larger change in dermatology, where symptoms like persistent itching began to be traced to specific immune signals. Today, the IL31 gene is best known in medicine because this line of research helped connect skin symptoms with targeted immune pathways.