The IL17RA gene helps immune cells receive signals that protect the skin, mouth, lungs, and other body surfaces from germs, especially certain fungi and bacteria. This gene plays an important role in controlling inflammation, the body’s defense response to infection or injury. If it does not work properly, you may be more likely to have repeated yeast infections such as thrush and other infections affecting body surfaces. Some variants can also change how strongly the immune system reacts.
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 building proteins, which are the parts of cells that do much of the work. Others mainly control when certain processes happen, where they take place, and how strongly they run. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can learn more in the LearnHub.
Overview
IL17RAGene function
What if the gene works
The IL17RA gene helps cells receive IL-17 immune signals. This supports immune responses and helps protect the skin, airways, and gut from certain bacteria and fungi.
Risk
What if the gene does not work
More disruptive variants in the IL17RA gene can impair IL-17 signaling and cause chronic mucocutaneous candidiasis, often with repeated Candida infections of the mouth, skin, and nails. Milder variants may cause later or less severe symptoms.
Treatment
What does that mean for your treatment
No IL17RA-specific treatment or drug choice is currently established for people with pathogenic or loss-of-function variants in the IL17RA gene. The IL-17 pathway is a well-studied drug target in inflammatory disease, but this has not led to a treatment tailored to IL17RA deficiency.
Conditions associated with IL17RA
Gene function
What if the gene works
Your body constantly protects the skin, mouth, airways, and gut from everyday germs. The IL17RA gene helps cells on these surfaces hear key immune messages and respond in a focused way. This supports normal barrier defense where your body meets the outside world.
Cells use the IL17RA gene to make a cell surface receiver for IL-17 immune messages. It lets cells respond to signals that are especially important at the skin, mouth, airways, and gut.
When these messages arrive, cells lining body surfaces switch on local defense programs. They release protective substances that help limit microbes and support the barrier between your body and the outside world.
The IL17RA gene also helps tissues send out signals that attract neutrophils, a type of white blood cell. This is part of how the IL17RA gene helps protect the skin and mouth from everyday germs.
IL17RA works with partner receptors so different IL-17 messages can be handled together. This helps keep local inflammation focused where it is useful and supports a balanced response in nearby tissue.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and only reflect natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IL17RA gene can weaken or block the cell surface receptor that responds to IL-17 signals, so cells pass those immune messages along poorly. Some changes reduce how much receptor reaches the cell surface, while more severe variants stop the protein from being made or cause it to break down early. This spectrum of IL17RA gene variants and immune signaling helps explain why some people have milder effects and others develop earlier, more persistent Candida yeast infections.
How variants are linked to conditions
Pathogenic variants in both copies of the IL17RA gene cause a rare inherited immune condition often called IL17RA deficiency, which is strongly linked to chronic mucocutaneous candidiasis. People with this diagnosis tend to have repeated Candida infections affecting the mouth, skin, nails, or genital area, and some also have recurrent bacterial skin or lung infections. In this setting, IL17RA gene variants linked to chronic mucocutaneous candidiasis can confirm the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a usual part of human biology. Most do not directly affect health and simply contribute to natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. 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?
For IL17RA, the chance of having the related immune condition mostly depends on inheriting harmful changes in both copies of the gene. There is not enough evidence to say that lifestyle or environmental changes lower this inherited risk, although anything that weakens the body's defenses can make yeast infections harder to control in people already living with the condition.
Inheritance of IL17RA variants
For families asking how IL17RA gene variants are inherited, the best-established pattern is autosomal recessive. This means a child usually inherits one IL17RA gene variant from each parent. Parents who carry one variant are often healthy themselves, but with each pregnancy there is a 25% chance the child will inherit both variants, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither variant. Sons and daughters are affected at the same rate.
What does my IL17RA result mean for my family?
For families, an IL17RA result usually matters most in a recessive pattern. Parents, brothers, sisters, and children may carry the same gene change, and full siblings can sometimes also have the condition. Relatives may want to learn whether they are carriers, especially if there is a family history of repeated yeast infections or if they are planning children.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for IL17RA variants uses a blood or saliva sample to read the IL17RA gene and look for changes linked to inherited immune conditions. A lab compares your DNA with a reference sequence, then reports whether a variant was found and if it is known to be benign, uncertain, or disease-causing.
When should I consider getting a genetic test?
You may want to discuss IL17RA genetic testing if someone has repeated, severe, or hard-to-treat yeast infections of the mouth, skin, nails, or genitals, especially from childhood. Testing can also be considered when these infections run in the family or are part of a suspected inherited immune condition.
A genetic result is only one part of your health story
Genetic results can be informative, yet what they reveal varies with the condition and the specific variant. Over time, the body is also shaped by factors including lifestyle, environment, age, and medical history. For some conditions, particularly those affected by many genes, genetic information provides context rather than certainty and is best understood alongside other aspects of care. In other situations, a genetic result can give a clear answer. In areas like medication response, these results can also help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in the body’s instructions can change how a drug is absorbed, broken down, moved through the body, or how strongly it acts at its target. This helps explain why the same treatment works well for one person, works less well for another, or causes more side effects in some people. These differences are common and are one part of the bigger picture, along with age, other health conditions, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can shape a person’s response to medication. It studies links between genes and drugs to better explain why the same treatment may work differently from one person to another. For many medicines, genes help influence how strongly a drug affects the body or how the body handles it. This information can support treatment decisions that are more informed and more personalized. If you want to explore this subject further, you can learn more in the LearnHub.
Drugs influenced by the IL17RA gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices. If you have concerns about side effects, how well a treatment is working, or how your medicines fit with your overall health, talk with your doctor or pharmacist.