The IRF6 gene helps guide how tissues in the face, mouth, and skin grow and join together before birth. If it does not work properly, a person may be born with a cleft lip, cleft palate, small pits on the lower lip, or other changes in early development. The protein made by this gene helps your cells switch on the right building plans at the right time. Some variants in the IRF6 gene are linked to Van der Woude syndrome and related conditions.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or manage processes in the body. Some genes provide the directions for producing proteins, the working parts of cells. Others mainly regulate when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a deeper look at this topic, you can learn more in the LearnHub.
Overview
IRF6Gene function
What if the gene works
The IRF6 gene helps control how cells in the skin and lining of the mouth grow, mature, and stick together. This supports normal development of the face, lips, and palate before birth.
Risk
What if the gene does not work
Variants in the IRF6 gene can cause Van der Woude syndrome or popliteal pterygium syndrome, often with cleft lip or palate and lower lip pits. Milder or more severe variants may affect which features appear and how strongly they appear.
Treatment
What does that mean for your treatment
No IRF6-specific treatment or drug selection approach is currently established for pathogenic variants in the IRF6 gene. Care follows standard management for a person’s features, and the IRF6 gene is mainly being studied in craniofacial development research rather than as a current treatment target.
Conditions associated with IRF6
Gene function
What if the gene works
IRF6 helps guide how skin and mouth lining cells grow into their final, working form. It is especially important during early development, when the lips, palate, and other surface tissues are being shaped. This helps explain the IRF6 gene's role in skin and facial development.
IRF6 helps switch other genes on and off at the right time. This timing supports orderly growth and cell maturation in tissues that cover body surfaces.
This gene helps young surface cells become specialized cells in the skin and the lining of the mouth. When that process runs smoothly, these tissues form a more stable outer layer.
During early development, IRF6 supports the periderm (a temporary surface layer on the embryo). This layer helps nearby tissues stay separate until they are ready to join in a controlled way.
IRF6 supports normal formation of the lips, palate, and nearby facial tissues before birth. It helps surface cells coordinate their growth so these structures take shape in an organized way.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and help create normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. At times, though, a variant can change how a gene functions to a greater extent and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IRF6 gene can change the protein’s shape, stability, or ability to bind DNA, so it cannot properly switch other genes on and off during early tissue development. Some changes only partly reduce activity, while others have a stronger effect or interfere with the usual copy of the protein. This helps explain why IRF6 gene variants and cleft lip and palate can show a wide range of severity, from milder findings to broader IRF6-related features.
How variants are linked to conditions
Pathogenic variants in the IRF6 gene cause Van der Woude syndrome and can also cause popliteal pterygium syndrome. These conditions often include cleft lip, cleft palate, lower lip pits, and sometimes missing teeth. Other IRF6 gene variants are linked to a higher chance of isolated cleft lip with or without cleft palate, but these common changes do not mean a child will definitely be born with a cleft.
A variant is not necessarily a diagnosis
Variants in genes are a routine part of human biology and are common across the general population. Most do not directly affect health and instead 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 multiple genes and environmental factors 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?
For IRF6, risk often depends most on the specific genetic change and family history. There is not yet broadly confirmed evidence that particular lifestyle or environmental factors clearly increase or reduce IRF6-related risk, so anyone concerned about personal or pregnancy-related risk should speak with a doctor or genetic counselor.
Inheritance of IRF6 variants
IRF6-related conditions can follow more than one inheritance pattern, so how IRF6 variants are inherited depends on the specific condition. For Van der Woude syndrome and popliteal pterygium syndrome, variants in the IRF6 gene are usually inherited in an autosomal dominant way, which means a parent with the variant has a 50% chance in each pregnancy of passing it on; some cases happen because of a new variant that was not inherited. A rarer IRF6-related condition has autosomal recessive inheritance, meaning a child inherits one altered copy from each parent.
What does my IRF6 result mean for my family?
For well-known IRF6-related conditions such as Van der Woude syndrome and popliteal pterygium syndrome, the pattern is usually dominant, so close relatives like a parent, brother, sister, or child may also carry the same gene change and may want to learn whether it is present in the family. If a parent carries the variant, each child has a 1 in 2 chance of inheriting it. Some IRF6 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
To look for changes in the IRF6 gene, a lab reads DNA from blood, saliva, or a cheek swab. Genetic testing for IRF6 variants can identify a specific variant, confirm whether a known family variant is present, and help clarify if a lip or palate condition is part of an inherited pattern.
When should I consider getting a genetic test?
Genetic testing for the IRF6 gene may be worth considering if you or your child has a cleft lip or a cleft palate, especially when there are small pits on the lower lip or a family history of similar findings. It can help clarify whether these features are part of an inherited condition and what that may mean for relatives.
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 kind of variant involved. How the body functions over time is also shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced 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 like medication response, genetic results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Small differences in genes can change how a drug is broken down, how strongly it works, or how sensitive your body is to it. This helps explain why the same treatment may work well for one person, cause more side effects in another, or have less effect in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can affect the way people respond to medicines. It looks at connections between genes and drugs to help explain why treatment effects can differ from one person to another. For many medications, genes may influence how the body processes a drug or how strong its effects are. This information can help support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the IRF6 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or which side effects are more likely. Questions about medicines, side effects, or your overall health are best discussed with your doctor or pharmacist.
History
IRF6 entered medical genetics through studies of families with cleft lip, cleft palate, and small pits in the lower lip, a pattern later recognized as Van der Woude syndrome. Initially understood only through visible traits, later recognized as tied to a specific gene, this condition helped researchers connect a clear inherited pattern to IRF6 in the early 2000s. From these first observations, research expanded steadily. Scientists then found that common variants near the IRF6 gene may also influence the chance of isolated cleft lip or cleft palate in the wider population. That discovery made IRF6 important not only for rare inherited conditions but also for understanding one of the most common birth differences affecting the face. Over time, this work helped shape modern genetic counseling for families affected by clefting.