Your body uses the ADGRG1 gene to guide early brain development, helping brain cells move into the right places and supporting the brain’s outer surface. If this gene does not work properly, a person may be born with changes in brain structure that can lead to developmental delay, seizures, speech or movement difficulties, and low muscle tone. In medicine, this gene is important because certain disease-causing variants can confirm a rare inherited condition in which parts of the brain develop with too many small folds.
What is a gene?
Genes are pieces of DNA that give your cells instructions for making molecules or directing activities in the body. Some genes carry the code for proteins, which are the parts of cells that do the work. Others mainly regulate when a process happens, where it takes place, and how active it is. Taken together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a closer look at this topic, you can find more in the LearnHub.
Overview
ADGRG1Gene function
What if the gene works
The ADGRG1 gene helps guide early brain development. Its protein supports how brain cells stick, move into place, and form the brain’s outer layer.
Risk
What if the gene does not work
More disruptive variants in the ADGRG1 gene can cause a brain development condition linked to delayed development, seizures, movement problems, and speech differences. Milder variants may lead to a wider range of features 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 ADGRG1 gene in clinical guidelines. Care is based on a person’s symptoms rather than the variant itself. The ADGRG1 gene is being studied as a possible biomarker and drug target in some cancers, but this has not become routine treatment use.
Conditions associated with ADGRG1
Gene function
What if the gene works
ADGRG1 helps cells sense where they are, attach to nearby structures, and pass signals inward. These everyday tasks are especially important during normal brain development, when cells need clear cues about when to stay put and when to move. Understanding the ADGRG1 gene’s function helps you see how cells organize tissues in a steady, controlled way.
Its protein sits on the cell surface as a receptor (a signal receiving protein). This lets cells detect outside cues and turn them into signals that help guide growth, shape, and movement.
ADGRG1 helps cells attach to nearby support material and to neighboring cells. That steady contact helps tissues keep their structure and gives cells a clear sense of position.
This gene helps control when cells stay in place and when they move. In growing tissues, that balance supports orderly cell travel and helps cells settle in the right spots.
During early brain development, ADGRG1 helps guide how nerve cells and support cells interact with the brain’s outer surface. These signals support normal layering and folding as the brain takes shape before birth.
What is a variant?
Genetic variants are small differences in the DNA sequence within a gene. They are common and help shape normal variation among people, including differences in appearance, metabolism, and the way the body reacts to environmental factors. Many do not produce any noticeable effect and are simply part of natural genetic diversity. Sometimes, though, a variant changes how a gene works to a greater extent and can contribute to, or directly cause, a genetic condition.
Genetic variants
What if the gene does not work
ADGRG1 gene variants can change the receptor's shape, keep it from folding properly, or stop it from reaching the cell surface, which weakens signaling between cells. How ADGRG1 gene variants change protein function often depends on severity: some variants leave partial activity, while others cut the protein short or leave little to no working protein. In people with bilateral frontoparietal polymicrogyria, greater loss of function often matches earlier or more marked features.
How variants are linked to conditions
Pathogenic variants in the ADGRG1 gene cause bilateral frontoparietal polymicrogyria, a brain development condition present from birth. In daily life, this ADGRG1 gene related condition is often linked to delayed development, muscle stiffness or weakness, coordination problems, and seizures, though severity varies. Some children also have speech and learning difficulties.
A variant is not necessarily a diagnosis
Genetic variants are a common and 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 indicates a possible link rather than a confirmed diagnosis, particularly when several genes and environmental factors are involved. In some situations, though, one well understood variant in a particular gene is enough to establish the diagnosis.
Are there things that can increase or change my risk?
For ADGRG1, risk is mainly shaped by inheritance: a child is affected when harmful changes are passed down in both copies of the gene, usually from two carrier parents. There is not yet broadly confirmed evidence that lifestyle or environmental factors increase or reduce this gene-related risk.
Inheritance of ADGRG1 variants
ADGRG1-related conditions are inherited in an autosomal recessive pattern. This ADGRG1 inheritance pattern means a child usually needs to inherit one altered copy of the ADGRG1 gene from each parent to be affected. When both parents carry one variant, each pregnancy has a 25% chance of an affected child, a 50% chance of a child who is a carrier, and a 25% chance of a child with no familial variant. Because the ADGRG1 gene is on chromosome 16, mothers and fathers can pass it on equally to sons and daughters.
What does my ADGRG1 result mean for my family?
For families of people with an ADGRG1-related condition, parents are often healthy carriers, and brothers or sisters may also be carriers or may be affected. Close relatives may want to learn whether the same gene change is present in the family, especially if there is a history of similar brain development differences or early movement and learning problems. This mainly matters for family planning and for understanding who else in the family could be affected.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the ADGRG1 gene, doctors use genetic testing for ADGRG1 variants on a blood or saliva sample. A lab reads the DNA sequence, and sometimes checks for missing or extra pieces, to see whether a variant linked to an ADGRG1 related condition is present.
When should I consider getting a genetic test?
Consider testing the ADGRG1 gene if a child has delayed development, seizures, muscle stiffness, or a brain scan showing a specific pattern of unusual brain folding. Testing can also help when these problems run in the family or when parents are blood relatives.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and on the kind of variant involved. How the body functions over time is also shaped by many factors, including lifestyle, environment, age, and medical history. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and is best interpreted together with other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results can also help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people taking the same treatment may break it down at different speeds or respond to it differently because their bodies handle the drug in slightly different ways. This kind of variation is common and can influence how well a medicine works or how sensitive someone is to side effects.
What is Pharmacogenetics?
Pharmacogenetics is the area of study focused on how genetic differences can shape a person’s response to medications. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. With many medicines, genes can influence both how strongly a drug works and how the body handles it. This information can support better informed, more individualized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the ADGRG1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines. If you have questions about side effects, medication changes, or health concerns linked to this gene, talk with your doctor or pharmacist.
History
ADGRG1 was first identified in the late 1990s and was initially known as GPR56, reflecting how genes were often named before their roles were clearer. In 2004, researchers linked variants in the ADGRG1 gene to a rare inherited brain development condition called bilateral frontoparietal polymicrogyria, a finding that helped solve a long-standing clinical puzzle. From these first observations, research expanded steadily. Later work connected the gene to a broader group of cell surface receptors and led to its updated name, ADGRG1, under a modern naming system. Scientific classifications changed as researchers learned more about the gene. This history made ADGRG1 an important reference point in the study of inherited brain development conditions.