The NECTIN4 gene helps nearby cells stick to each other, especially in the skin and other tissues forming before birth. This gene plays an important role in how the body builds hair, teeth, nails, and sweat glands. If the NECTIN4 gene does not work properly, some people are born with a condition that can include sparse hair, missing or small teeth, reduced sweating, and joined fingers or toes. It is also studied in cancer care because some tumors make extra amounts of the protein made from this gene.
What is a gene?
Genes are sections of DNA that give your cells instructions for making molecules or directing processes in the body. Some genes carry the code for proteins, the parts of cells that do much of the work. Others mainly regulate when certain processes happen, where they occur, and how strongly they run. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, and medications. To explore this topic further, you can read more in the LearnHub.
Overview
NECTIN4Gene function
What if the gene works
The NECTIN4 gene helps make nectin-4, a cell surface protein that helps cells stick together. It supports stable growth and organization in tissues such as skin.
Risk
What if the gene does not work
More disruptive variants in the NECTIN4 gene can cause a form of ectodermal dysplasia with fused fingers or toes. People may have sparse hair, changes in teeth or nails, and skin differences, with features ranging from milder to more marked.
Treatment
What does that mean for your treatment
No NECTIN4-specific treatment or drug choice is currently established for people with pathogenic variants in the NECTIN4 gene. Separately, Nectin-4 on tumor cells is an established drug target in some urothelial cancers, where enfortumab vedotin may be used based on the cancer setting rather than an inherited variant in the NECTIN4 gene.
Conditions associated with NECTIN4
Gene function
What if the gene works
Your skin and other body linings depend on the NECTIN4 gene to help neighboring cells connect in an orderly way. It supports the contact points that keep cells attached while tissues grow and renew themselves. This is a central part of how the NECTIN4 gene works in skin cells and other surface tissues.
Its protein sits at the cell surface and helps neighboring cells latch onto each other. These links are especially important in skin and other body linings, where cells need to stay connected as the tissue stretches, sheds, and renews.
NECTIN4 helps organize cell junctions, the contact sites where one cell meets the next. This gives tissues a more even structure and helps many cells behave like one continuous layer.
Through cell to cell contact, this gene also helps guide where cells settle and how they line up during normal growth. That coordination supports orderly development and routine tissue upkeep.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These changes are common and help account for normal human diversity, such as 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 situations, though, a variant can change how a gene functions more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NECTIN4 gene can change the protein’s shape, stability, or delivery to the cell surface, which is how NECTIN4 gene variants affect protein function. Some variants weaken binding areas, while more disruptive variants cause the protein to be cut short or broken down before it can work. Milder variants may leave some activity, but severe loss of function can have a stronger effect and may be linked to earlier or more marked features of ectodermal dysplasia with syndactyly.
How variants are linked to conditions
Pathogenic variants in the NECTIN4 gene cause ectodermal dysplasia-syndactyly syndrome 1, a rare inherited condition that can affect hair, teeth, nails, skin, and the fingers or toes. This is the main confirmed condition linked to the NECTIN4 gene in human genetics. In families with this diagnosis, two pathogenic variants, one inherited from each parent, are usually found. For people looking into conditions linked to NECTIN4 gene variants, this syndrome is the key established association.
A variant is not necessarily a diagnosis
Across the general population, genetic variants are common and form a normal part of human biology. Most do not directly affect health and instead reflect natural variation among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In other situations, though, one well understood variant in a particular gene may be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For NECTIN4, risk is mainly shaped by inheritance rather than lifestyle or environment. A child’s chance of being born with a NECTIN4-related condition is higher when both biological parents carry a disease-causing variant, and this is more likely in families with a known history or when the parents are blood relatives.
Inheritance of NECTIN4 variants
NECTIN4-related conditions are inherited in an autosomal recessive pattern. This means a child inherits one NECTIN4 gene variant from each parent, and parents who each carry one variant are usually unaffected carriers. When both parents are carriers, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practice, how NECTIN4 variants are inherited follows this two-carrier pattern and affects sons and daughters equally.
What does my NECTIN4 result mean for my family?
For NECTIN4, the established family pattern is recessive, which usually means both parents are healthy carriers. Brothers and sisters may also have the condition or be carriers, and other relatives may carry the same gene change without knowing it. This can matter for family planning, because two carriers can have a child with the condition.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for NECTIN4 variants uses a blood, saliva, or cheek swab sample to read the NECTIN4 gene and look for changes in its DNA code. It can check for a known family variant or scan the whole gene as part of a broader panel. Results may show whether you carry a variant linked to a genetic condition.
When should I consider getting a genetic test?
Consider NECTIN4 genetic testing if someone has a rare pattern of changes affecting hair, teeth, nails, or skin along with joined fingers or toes, especially when similar features run in the family. Testing can help confirm an inherited condition and clarify the chance of it affecting future children.
A genetic result is only one part of your health story
Genetic findings can provide meaningful insight, but how much they reveal varies by the condition and the specific type of variant. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is best understood together 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 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 bloodstream, or responds to it at its target. This helps explain why the same medication works well for one person, works less well for another, or causes more side effects in someone else. These differences are common and are one reason treatment response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect their response to medicines. It studies the relationship between genes and medications to clarify why the same treatment may work differently in different people. With many drugs, genes can influence both how strongly the medicine works and how the body handles it. This information can support treatment choices that are more informed and more personalized. More detail on this topic is available in the LearnHub.
Drugs influenced by the NECTIN4 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are prescribed, so general medication questions are best discussed with your doctor. NECTIN4 has been studied mainly as a marker and treatment target in certain cancers, rather than as an inherited gene change that routinely predicts medication response.