The ADAM9 gene gives cells instructions for a surface protein that helps them trim and release other proteins, attach to nearby tissue, and pass along signals. This gene plays an important role in how cells move, interact, and maintain healthy tissue, including in the retina at the back of the eye. If the ADAM9 gene does not work properly, some people can develop an inherited retinal condition called cone-rod dystrophy, which may lead to worsening vision over time.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes provide the code for proteins, which are the parts of cells that do much of the work. Others are mainly involved in controlling when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. More detail is available in the LearnHub.
Overview
ADAM9Gene function
What if the gene works
The ADAM9 gene helps cells communicate, attach, and move. Its protein sits at the cell surface and cuts certain proteins, which supports signaling, tissue repair, and normal growth.
Risk
What if the gene does not work
When the ADAM9 gene does not work properly, it is linked to inherited cone-rod retinal disease, with loss of central and sometimes night or side vision. Milder or more severe variants can affect onset and severity.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by a pathogenic variant in the ADAM9 gene in routine clinical guidelines. The ADAM9 gene is being studied as a possible biomarker and drug target in some cancers, but this has not yet led to established ADAM9 specific care.
Conditions associated with ADAM9
Gene function
What if the gene works
Cells use the ADAM9 gene to manage signals at their surface and stay connected to nearby tissue. Its protein sits in the cell membrane, where it helps trim certain proteins and support cell-to-cell communication. Understanding what the ADAM9 gene does helps explain how cells respond to routine growth and repair.
The ADAM9 protein sits at the cell surface and cuts selected proteins there. This can release protein pieces or change how those proteins work, helping cells adjust their outer signals.
By trimming growth-related proteins and receptors, the ADAM9 gene helps cells send and receive messages. This supports everyday control of cell behavior during tissue maintenance.
ADAM9 also helps cells interact with nearby cells and with the surrounding support material. That contact can help cells stay anchored and move in an organized way when tissue is renewed.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help account for normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can more substantially change how a gene works and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
How ADAM9 gene variants affect protein function depends on the type of change. Milder missense variants may reduce how well the ADAM9 protein folds, reaches the cell surface, or cuts target proteins, while more severe nonsense, frameshift, or splice variants can greatly lower protein production or leave the protein unstable. In people with two pathogenic ADAM9 variants, this loss of activity is linked to cone-rod retinal disease, and greater functional loss often goes with earlier or more marked vision changes.
How variants are linked to conditions
Pathogenic variants in the ADAM9 gene cause cone-rod dystrophy 9, an inherited eye condition that affects the retina. People with ADAM9 gene variants linked to cone-rod dystrophy may develop worsening central vision, trouble seeing colors, glare sensitivity, and later night vision problems. This is the main well-established condition tied to the ADAM9 gene, and it usually follows an autosomal recessive pattern, meaning both copies of the gene are affected.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common throughout the general population. Most do not directly affect health and simply reflect 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 understood variant in a specific gene can be 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 ADAM9 gene. Anyone with concerns about personal or family risk can speak with a doctor or genetic counselor.
Inheritance of ADAM9 variants
ADAM9-related eye conditions are inherited in an autosomal recessive pattern. This means a person usually develops the condition only when both copies of the ADAM9 gene carry a disease-causing variant, with one altered copy inherited from each parent. Parents who each carry one variant are often unaffected carriers, and with each pregnancy there is a 25% chance of having an affected child. In practical terms, ADAM9 gene inheritance most often involves two carrier parents, and sons and daughters are affected equally.
What does my ADAM9 result mean for my family?
For families with a disease-causing ADAM9 result linked to inherited vision loss, relatives may also carry the same gene change. Brothers and sisters can sometimes be affected or be carriers, and parents are often healthy carriers. Family members may want to discuss the result with their doctor or a genetic counselor, especially if there is a family history of early vision problems.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for ADAM9 variants uses a blood sample, saliva, or a cheek swab to look for changes in the ADAM9 gene. A lab reads the DNA sequence and compares it with the usual sequence to identify variants and classify whether a specific change is present.
When should I consider getting a genetic test?
Consider genetic testing for ADAM9 if you or your child has an inherited eye condition with early loss of sharp central vision, color vision changes, glare, or worsening night vision, especially if similar vision problems run in the family. Finding an ADAM9 variant can help confirm the cause of this type of retinal condition.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they explain depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also shape how the body works. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside 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 handles medicines, so the same treatment may work differently from one person to another. Some people break down a drug more slowly or more quickly, while others are more or less sensitive to its effects. This can influence how well a medicine works and the chance of side effects, which is why medication response is often not the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes affect the way they respond to medicines. By studying links between genes and medications, it helps explain why the same treatment can work differently in different people. For many drugs, genetic factors influence how strongly a medicine works or how the body handles it. This information can support treatment choices that are more informed and more tailored to the individual. To explore this subject in more detail, you can learn more in the LearnHub.
Drugs influenced by the ADAM9 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work, so general questions about medications are best discussed with your doctor. If you have concerns about side effects, drug interactions, or whether a treatment is a good fit for you, talk with your doctor or pharmacist.