The ARHGAP31 gene helps control signals that guide how cells change shape, move, and grow during early development. This gene plays an important role in forming the scalp, limbs, and blood vessels. If it does not work properly, a person may be born with areas of missing scalp skin and limb differences such as short or absent fingers or toes, and some may have heart or blood vessel changes, a pattern seen in Adams-Oliver syndrome. This gene is mainly known in medical genetics rather than popular culture.
What is a gene?
Genes are sections of DNA that carry instructions cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do much of the work. Others are used mainly to manage when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can also influence how you respond to food, stress, and medicines. For a deeper look at this topic, you can read more in the LearnHub.
Overview
ARHGAP31Gene function
What if the gene works
The ARHGAP31 gene helps control signals that guide how cells change shape, move, and organize. This is especially important during early development, including the normal formation of the arms, hands, legs, and feet.
Risk
What if the gene does not work
Variants in the ARHGAP31 gene are linked to Adams-Oliver syndrome, which can cause scalp skin defects and hand or foot differences, sometimes with heart or blood vessel involvement. Effects can range from mild to more marked depending on the variant.
Treatment
What does that mean for your treatment
No ARHGAP31-specific treatment or drug selection approach is currently established; care is guided by the person’s symptoms and findings rather than the variant itself.
Conditions associated with ARHGAP31
Gene function
What if the gene works
Cells constantly adjust their shape, grip, and movement as tissues grow and renew themselves. The ARHGAP31 gene helps fine tune the signals behind those changes. Understanding what the ARHGAP31 gene does in your body helps show how cells stay organized as they move and settle into place.
The ARHGAP31 gene helps switch off small cell signals after they have done their job. This gives cells better timing for when to change shape, attach, or move.
Its protein helps organize actin, a set of tiny fibers that acts like a cell’s inner framework. This supports steady cell shape and controlled reshaping when needed.
Many cells need to spread, grip nearby surfaces, and move in a coordinated way. The ARHGAP31 gene supports these steps so tissues can grow with a more orderly pattern.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help shape normal differences among people, including appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the ARHGAP31 gene often create a shortened protein that is broken down more slowly and switches off cell signals called Cdc42 and Rac1 too strongly. This helps explain how ARHGAP31 gene variants affect cell signaling, because the altered protein often becomes too active rather than simply stopping work. Stronger changes may be linked to earlier or more noticeable Adams-Oliver syndrome features, while milder variants may have a smaller cellular impact.
How variants are linked to conditions
Pathogenic variants in the ARHGAP31 gene are a well-established cause of ARHGAP31-related Adams-Oliver syndrome, a rare inherited condition that can affect the scalp, fingers or toes, and sometimes the heart or blood vessels. Signs can vary a lot from one person to another, even within the same family. Finding a disease-causing variant in the ARHGAP31 gene can help confirm the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of being human and are widespread in the general population. Most do not directly affect health and simply represent natural variation among people. For many genes, carrying a variant associated with a condition indicates a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors also play a role. In some cases, though, one well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For ARHGAP31, risk is mostly set by whether a disease-causing variant is present, often in families with Adams-Oliver syndrome. There is no well-established evidence that lifestyle or environmental factors meaningfully change the chance of having the condition. What can vary is how strongly it shows up, so monitoring and early care are more relevant than risk reduction.
Inheritance of ARHGAP31 variants
ARHGAP31-related conditions are inherited in an autosomal dominant pattern. For families asking how ARHGAP31 gene variants are inherited, this usually means a parent carrying the variant has a 50% chance of passing it to each child. Some people with an ARHGAP31 variant are the first in their family to have it because the variant arose new in them rather than being inherited from either parent. Mothers and fathers can both pass it on to sons or daughters.
What does my ARHGAP31 result mean for my family?
ARHGAP31 is linked to a form of Adams-Oliver syndrome that usually runs in families in a dominant way, so close relatives such as parents, brothers, sisters, and children may also carry the same gene change. If a parent has the same result, each child has a 1 in 2, or 50%, chance of inheriting it. Some cases happen for the first time in one person, so a parent may not always be the source.
Genetic information
Genetic testing
How you find out about variants
ARHGAP31 genetic testing for Adams-Oliver syndrome usually uses a blood or saliva sample. A lab reads the ARHGAP31 gene as part of a targeted gene panel, exome, or genome test and looks for variants that may explain a person’s features or help clarify whether the same variant is present in relatives.
When should I consider getting a genetic test?
Testing may be worth considering if a baby or child has missing or shortened fingers or toes, areas of missing skin on the scalp, or a family history of Adams-Oliver syndrome. An ARHGAP31 test can help confirm whether this gene is the cause and clarify whether it may run in the family.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal varies by the condition and the type 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, especially those influenced by many genes, genetic information offers context rather than certainty and is best viewed together with 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 perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small inherited differences can change how the body breaks down a drug, how much of it reaches the bloodstream, or how strongly the body reacts to it. This helps explain why the same treatment may work well for one person, work less well for another, or cause more side effects in someone else. These differences are common and are only one part of the picture, alongside age, liver and kidney function, other medicines, and overall health.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can affect the way a person responds to medications. It examines connections 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 how strong a drug’s effects are or how the body handles it. This information can support more informed and more individualized treatment decisions. You can learn more about this topic in the LearnHub.
Drugs influenced by the ARHGAP31 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 questions about side effects, new symptoms, or how a treatment is affecting you are best discussed with your doctor.