The ADAM18 gene helps make a protein found mainly in the testes that may support normal sperm development and function. If this gene does not work as expected, sperm function may be altered, which can play a role in male infertility. This gene plays an important role in research on human reproduction, but it is not a gene that usually appears in everyday health news.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or direct processes in the body. Some genes hold the instructions for producing proteins, which are the parts of cells that do much of the work. Other genes mainly regulate when certain processes happen, where they happen, and how strongly they occur. As a whole, genes affect how the body develops and functions, and they can also influence how you respond to food, stress, or medications. For a closer look at this topic, you can find more in the LearnHub.
Overview
ADAM18Gene function
What if the gene works
The ADAM18 gene helps make a protein found mainly in the testes and on sperm cells. It supports cell attachment and signaling, which may help normal sperm development.
Risk
What if the gene does not work
Variants in the ADAM18 gene may reduce or alter a sperm surface protein involved in cell adhesion and signaling. Milder variants can leave some activity, while more severe variants may greatly disrupt these cell to cell interactions.
Treatment
What does that mean for your treatment
A pathogenic or loss-of-function variant in the ADAM18 gene does not currently guide any established treatment or drug choice in clinical practice.
Gene function
What if the gene works
Much of the ADAM18 gene function relates to how cells make contact at their surface, especially in sperm. This gene makes a protein that sits in the cell membrane and faces outward. In normal cells, that placement supports steady interaction with nearby cells and the local environment.
The ADAM18 protein sits in the cell membrane, where it helps the cell surface interact with nearby cells and surrounding material. These steady contacts support normal cell communication and attachment.
ADAM18 is most active in the testis and contributes to the specialized outer surface of developing sperm. This supports the surface features needed for normal sperm function.
What is a variant?
A genetic variant is a minor 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 cause any noticeable effects and simply represent natural genetic variation. In some situations, though, a variant can more substantially change how a gene functions and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
In discussions of how ADAM18 gene variants affect protein function, most changes are expected to alter the protein's shape, stability, or ability to reach the cell surface and interact with nearby proteins. Milder variants may leave partial function, while more severe variants can cause the protein to be made incorrectly, broken down early, or absent from the membrane. For the ADAM18 gene, these effects are mainly described at a molecular level rather than linked to one well-established medical condition.
How variants are linked to conditions
Current evidence does not show a broadly confirmed pattern of ADAM18 gene variants linked to conditions, although this may change as research develops. If you carry a reported change in the ADAM18 gene, your doctor or genetic counselor can interpret it alongside your personal and family history.
A variant is not necessarily a diagnosis
Genetic variants are a routine 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. For 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 also play a role. In some situations, though, a single well characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the ADAM18 gene. If ADAM18 appears on your test report and you are concerned about what it means for you or your family, a doctor or genetic counselor can help put it in context.
Inheritance of ADAM18 variants
ADAM18 gene inheritance has not been tied to a single, broadly confirmed inherited condition. Research on this gene is still developing, so there is no well-established autosomal dominant, autosomal recessive, or X-linked disease pattern to describe for ADAM18 at this time. The ADAM18 gene is located on chromosome 8, which is an autosome, so each person inherits one copy from their mother and one copy from their father.
What does my ADAM18 result mean for my family?
There isn’t yet a broadly confirmed inheritance pattern tied to a specific health condition for ADAM18, though this understanding can change as research develops. If you have a specific ADAM18 result and questions about what it could mean for your family, a doctor or genetic counselor can help explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
ADAM18 genetic testing looks for variants by reading your DNA from a blood sample, cheek swab, or saliva. Depending on the reason for testing, the lab may examine only the ADAM18 gene or include it in a larger panel, exome, or genome test, then report whether a variant was found.
When should I consider getting a genetic test?
There is not yet a broadly established, ADAM18-specific medical reason for genetic testing in routine care. Decisions about testing are best made with a doctor or genetic counselor, based on your personal health history, symptoms, and family history.
A genetic result is only one part of your health story
A genetic result can be informative, but how much clarity it provides depends on the condition and the type of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those affected 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 may offer 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 people respond to medicines. Small differences in genes 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 may work well for one person, do less for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can affect the way a person responds to medication. It examines 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 how strongly a drug works or how the body processes it. This information can help support more informed, individualized treatment decisions. More about this topic is available in the LearnHub.
Drugs influenced by the ADAM18 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about side effects, new symptoms, or whether a treatment is right for you are best discussed with your doctor.