The ADGRE2 gene helps certain immune cells, especially mast cells, sense physical stimulation and respond in a controlled way. This gene plays an important role in histamine release, a normal alarm signal behind itching and swelling. If the gene carries a disease-causing variant, even mild vibration or rubbing can trigger inherited vibratory hives, with redness, itching, swelling, or flushing after things like towel drying, jogging, or using vibrating tools.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or direct activities in the body. Some genes provide the directions for building proteins, 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 are carried out. Together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can find additional information in the LearnHub.
Overview
ADGRE2Gene function
What if the gene works
The ADGRE2 gene helps certain white blood cells sense contact with nearby tissues and adjust how tightly they stick. This supports immune cell signaling and movement during normal inflammation.
Risk
What if the gene does not work
Some ADGRE2 variants are linked to vibratory urticaria, where skin vibration can trigger hives, redness, itching, or swelling. Milder and more severe variants may differ in how strongly the protein is affected, which can influence symptom severity and onset.
Treatment
What does that mean for your treatment
No ADGRE2-specific treatment or drug selection approach is currently established. The ADGRE2 gene is being studied in mast cells to better understand vibration-triggered hives and swelling, which may help guide future targeted therapies.
Conditions associated with ADGRE2
Gene function
What if the gene works
In your immune system, the ADGRE2 gene helps certain white blood cells sense their surroundings and respond in a controlled way. Its protein sits on the cell surface, where it supports contact with nearby tissues and other cells. This helps explain how the ADGRE2 gene works in immune cells during everyday defense and cleanup.
The ADGRE2 protein sits on the outside of certain white blood cells and helps them read signals from their surroundings. This supports normal immune surveillance as cells check nearby tissues and other cells.
ADGRE2 helps immune cells attach to nearby cells and to the tissue matrix, the supportive material around cells. This temporary grip lets cells pause, inspect an area, and then keep moving when needed.
By helping cells grip and release their surroundings, the ADGRE2 gene supports normal movement through tissues. This helps white blood cells reach places where routine defense or cleanup is needed.
Contact through ADGRE2 can send signals into the cell that fine tune how active it becomes. This helps certain white blood cells respond in a measured way during normal immune communication.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of 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. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the ADGRE2 gene can change how tightly the receptor’s two protein pieces stay linked, which helps explain how ADGRE2 gene variants affect mast cell signaling. The best-known change makes that link less stable, so vibration can set off cell activation more easily than usual. Milder variants may cause a smaller shift in receptor behavior, while more disruptive variants can have a stronger effect and may be linked to earlier or more noticeable vibratory urticaria.
How variants are linked to conditions
Pathogenic variants in the ADGRE2 gene are best known for causing vibratory urticaria, a rare inherited condition in which skin can become itchy, red, and swollen after vibration or repeated friction. This is the main condition linked to ADGRE2 gene variants in human genetics. In an affected family, finding the known pathogenic variant can help confirm the diagnosis.
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 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 some situations, though, one well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For people with a disease-causing change in the ADGRE2 gene, the main factor is having the variant itself, and symptoms are often set off by vibration or repeated friction rather than by diet or general lifestyle. Activities such as towel-drying, running, cycling, or using vibrating tools can trigger episodes, while avoiding known triggers can help prevent symptoms.
Inheritance of ADGRE2 variants
ADGRE2-related vibratory urticaria is inherited in an autosomal dominant pattern. That means a parent carrying a disease-causing variant in the ADGRE2 gene can pass it to a child, and each pregnancy has a 50% chance of inheriting that variant. Sons and daughters are affected at similar rates because the ADGRE2 gene is on chromosome 19, not a sex chromosome. In families asking how ADGRE2 variants are inherited, the pattern is usually vertical, with the variant seen across generations.
What does my ADGRE2 result mean for my family?
For ADGRE2, the best-known inherited condition is vibratory hives, where skin can swell, itch, or turn red after vibration or repeated rubbing. This usually follows a dominant family pattern, so close relatives such as a parent, brother, sister, or child may also carry the same change and could have similar symptoms, even if theirs are milder. In some families, the change can start for the first time in one person rather than being passed down from a parent.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the ADGRE2 gene, a lab reads DNA from a blood, saliva, or cheek swab sample. ADGRE2 genetic testing compares the gene's DNA code with a reference sequence and may identify a variant linked to your symptoms or family history.
When should I consider getting a genetic test?
If you or close relatives get itching, redness, swelling, or hives after vibration, such as towel-drying, jogging, or using power tools, genetic testing for the ADGRE2 gene may be worth discussing. A confirmed change can help explain an inherited form of vibratory hives.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but what it shows depends on the condition and the kind of variant involved. How the body works over time is also influenced by factors such as lifestyle, environment, age, and medical history. In some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic results can also help place personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment can work well for one person, seem less helpful for another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect a person’s response to medications. It studies relationships between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support more informed, individualized treatment decisions. To explore this topic in greater detail, you can learn more in the LearnHub.
Drugs influenced by the ADGRE2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so any questions about medicines, side effects, or new symptoms are best discussed with your doctor or pharmacist.
History
The ADGRE2 gene entered the medical literature under the older name EMR2 as researchers were mapping a group of related immune system genes in the late 1990s. It was first recognized through laboratory studies of white blood cells rather than through a widely known public story. As medical science evolved, so did understanding of this gene, and it was later renamed ADGRE2 to fit a newer, more consistent system for this gene family. A notable milestone came in 2016, when variants in the ADGRE2 gene were linked to a rare inherited form of vibratory urticaria, a condition in which skin symptoms can appear after vibration or friction. That finding connected years of basic gene research with a clear human condition and gave the gene a more defined place in clinical genetics.