The ADGRA2 gene helps guide the growth of blood vessels in the brain and supports the blood-brain barrier, the protective lining that controls what enters brain tissue. If it does not work properly, these vessels may form abnormally, which can affect how the brain develops and functions. Rare harmful variants in the ADGRA2 gene have been linked to developmental delay, low muscle tone, seizures, and problems with movement or balance.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate activities in the body. Some genes hold the information needed to produce proteins, the parts of cells that do much of the work. Other genes mainly direct when, where, and how strongly certain processes take place. Taken 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 find more in the LearnHub.
Overview
ADGRA2Gene function
What if the gene works
The ADGRA2 gene helps guide blood vessel growth in the brain and spinal cord. It supports signals that build and maintain the blood-brain barrier, which helps keep the brain’s environment stable.
Risk
What if the gene does not work
More severe ADGRA2 gene variants can more strongly weaken cell signals that help blood vessels grow in the developing brain. Milder variants may leave partial activity, so the functional impact can vary.
Treatment
What does that mean for your treatment
No ADGRA2-specific treatment or management approach is currently established for people with a pathogenic variant in the ADGRA2 gene. In research, the ADGRA2 gene is being studied for its role in blood vessel growth in the brain and as a possible drug target in tumor blood vessel growth.
Gene function
What if the gene works
In the brain and spinal cord, the ADGRA2 gene helps blood vessels grow in the right places and form a tight protective lining. Its protein mainly works in the cells that line these vessels, where it supports blood-brain barrier function. Understanding how this gene works helps show how the nervous system gets a steady, protected blood supply.
The ADGRA2 gene helps guide new blood vessels as they grow through the brain and spinal cord. This supports orderly brain blood vessel development so oxygen and nutrients can reach nerve tissue.
Its protein helps vessel lining cells form the blood-brain barrier, the filter that controls what moves from blood into brain tissue. This helps keep the brain’s environment stable for everyday signaling.
The ADGRA2 gene helps cells respond to WNT signals, which are growth messages that shape brain vessels. By strengthening these signals, it helps vessels mature in a more controlled way.
What is a variant?
A genetic variant is a minor difference in the DNA sequence within a gene. These differences are common and help explain normal variation among people, including 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 diversity. In some situations, though, a variant changes how a gene works more substantially and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
How ADGRA2 gene variants affect protein function depends on the change itself. Some missense variants change the protein’s shape or stability, so less of it reaches the cell surface or interacts normally with partner proteins. More disruptive variants, including nonsense, frameshift, or certain splice variants, can sharply reduce protein production or stop it altogether. This spectrum from milder to more severe variants can cause partial loss of function or near-complete loss of function.
How variants are linked to conditions
The ADGRA2 gene does not yet have a broadly confirmed link to a specific health condition, though research on how ADGRA2 gene variants are linked to disease is still developing. A change in this gene on a test report does not by itself point to a known diagnosis. If you have a confirmed ADGRA2-related finding, your doctor or genetic counselor can interpret it in the context of your symptoms and family history.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and simply contribute to natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a definite diagnosis, particularly when several genes and environmental influences also play a role. In certain situations, though, one well understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the ADGRA2 gene. If a test finds a change in ADGRA2, its meaning depends on the exact change and the person's overall health picture, so discussing personal risk with a doctor or genetic counselor is the best next step.
Inheritance of ADGRA2 variants
There is not yet a broadly confirmed, disease-specific inheritance pattern for the ADGRA2 gene, so how ADGRA2 gene variants are inherited in relation to a defined genetic condition is still being worked out. As research grows, this picture may become clearer. The ADGRA2 gene is located on chromosome 8, which is an autosome, so each person inherits one copy from each parent.
What does my ADGRA2 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for ADGRA2, though this understanding can change as research develops. If you have a specific ADGRA2 result and questions about what it could mean for your family, a doctor or genetic counselor can explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for ADGRA2 variants uses a blood or saliva sample. A lab reads the ADGRA2 gene and compares it with a reference sequence to look for changes. Results are interpreted alongside personal and family history because some findings are clearly benign while others need clinical context.
When should I consider getting a genetic test?
There is not yet a broadly established reason to do genetic testing just for the ADGRA2 gene. Testing decisions are usually based on the overall picture, such as unexplained brain or development-related symptoms or a family history, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it reveals depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, shape how the body functions over time. 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 offer 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 your body responds to medicines. Small differences in genes can change how a drug is broken down, how strongly it works, or how sensitive you are to side effects. This helps explain why the same treatment can work well for one person but less well for another. 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 a person’s genes affect their response to medicines. It looks at gene-drug relationships to help explain why the same treatment may work differently from one person to another. For many medications, genes influence how strongly a drug works or how the body handles it. This information can support treatment decisions that are more informed and more individualized. More about this topic is available in the LearnHub.
Drugs influenced by the ADGRA2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so questions about side effects, treatment response, or other health concerns are best discussed with your doctor.
History
ADGRA2 was first identified in the early 2000s during studies of blood vessel genes and was initially called TEM5, short for tumor endothelial marker 5. It was later also known as GPR124 as scientists recognized it as part of a broader receptor family. Initially understood only through visible traits, later recognized as tied to a specific gene, its place in brain vessel research became clearer as animal studies advanced. As naming systems improved, researchers reassigned it to the adhesion G protein coupled receptor family and the current name, the ADGRA2 gene, came into use. Over time, descriptions became more precise. That shift reflects a wider trend in genetics, where early discovery names are often replaced by standardized names that better match a gene’s biological family.