The ARMC5 gene helps keep cell growth in check, especially in the adrenal glands. If it does not work properly, extra adrenal tissue can grow and make too much cortisol, which may lead to weight gain, high blood pressure, diabetes, easy bruising, or weak bones. Some people with variants in the ARMC5 gene develop primary bilateral macronodular adrenal hyperplasia, a condition in which both adrenal glands become enlarged. Pathogenic variants can run in families.
What is a gene?
Genes are sections of DNA that provide cells with instructions to make molecules or to regulate processes in the body. Some genes hold the code for producing proteins, the cell parts that carry out much of its work. Other genes are mainly involved in controlling when certain processes take place, where they occur, and how strongly they happen. Together, genes affect how the body develops and functions, 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
ARMC5Gene function
What if the gene works
The ARMC5 gene helps control cell growth and normal cell turnover. It supports healthy adrenal tissue by helping cells stop dividing when needed and by guiding damaged cells to die off.
Risk
What if the gene does not work
Variants in the ARMC5 gene can cause enlarged adrenal glands and excess cortisol, leading to Cushing syndrome features. Milder or more severe variants may affect when symptoms start and how strongly blood pressure, weight, or blood sugar change.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently tailored specifically to a pathogenic variant in the ARMC5 gene. Care is guided by hormone levels and adrenal changes rather than the variant itself. The ARMC5 gene is being studied as a biomarker in adrenal disease and some meningiomas, but this has not yet changed standard treatment.
Conditions associated with ARMC5
Gene function
What if the gene works
ARMC5 helps cells stay organized as they grow, communicate, and renew themselves. Across many tissues, the ARMC5 gene contributes to steady, routine cell activity. Normal ARMC5 gene function supports protein teamwork inside cells and helps keep cell growth and cell turnover balanced.
ARMC5 gives cells instructions for a protein that helps other proteins connect and work together. This supports cell signaling and keeps routine cell tasks coordinated.
ARMC5 helps keep cell growth controlled as tissues renew themselves. This supports stable tissue maintenance from day to day.
The ARMC5 gene contributes to planned cell death, a normal cleanup process that removes cells when they are no longer needed. This helps tissues maintain a healthy balance of older and newer cells.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and are part of normal human diversity, such as variation in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some situations, however, 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
Many changes in the ARMC5 gene reduce how much working protein a cell can make or leave the protein unstable, which helps explain how variants influence the ARMC5 gene's function. Milder variants may partly weaken the protein or its interactions, while more severe variants can shorten it early or stop it from being made at all. In ARMC5-related adrenal disease, more complete loss of activity often has a stronger cellular effect and can be linked to earlier symptoms.
How variants are linked to conditions
Pathogenic variants in the ARMC5 gene are a well-established cause of primary bilateral macronodular adrenal hyperplasia, an inherited condition in which both adrenal glands become enlarged and may make too much cortisol. This can lead to Cushing syndrome or milder cortisol excess found on testing. In families with ARMC5 gene variants and adrenal hyperplasia, a confirmed pathogenic variant helps explain the diagnosis and shows that the condition can run in the family.
A variant is not necessarily a diagnosis
Genetic variants are a normal feature of human biology and are commonly seen across the population. Most have no direct impact on health and simply reflect natural variation among people. For many genes, carrying a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when more than one gene and environmental factors also contribute. In some situations, though, a single well-characterized variant in a particular gene is enough to confirm the diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce health risks linked to the ARMC5 gene. In families with an ARMC5 change, risk can vary from person to person, and age may affect when related problems appear. Anyone concerned about personal or family risk should speak with a doctor or genetic counselor.
Inheritance of ARMC5 variants
Variants in the ARMC5 gene linked to inherited adrenal conditions are usually passed down in an autosomal dominant pattern. That means a parent carrying a disease-causing ARMC5 variant can pass it to a son or daughter with a 50% chance in each pregnancy. In families asking how ARMC5 variants are inherited, the key point is that one altered copy can run through generations. Not everyone who inherits the variant is affected in the same way, so family history can look variable.
What does my ARMC5 result mean for my family?
A harmful change in the ARMC5 gene can run in families in a dominant pattern, so close relatives such as a parent, brother, sister, or child may also carry the same change. For families with an ARMC5-related adrenal condition, relatives may want to learn whether the gene change is present, even if they feel well, because signs can appear later or vary from person to person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant, genetic testing for the ARMC5 gene uses a blood sample, saliva sample, or cheek swab. A lab reads the DNA sequence and checks for changes in the ARMC5 gene. Results may show a pathogenic variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Consider ARMC5 testing if you or close relatives have both adrenal glands enlarged or have growths in them, especially when this causes too much cortisol and Cushing syndrome. It can also help when this pattern runs in a family or appears at a younger age.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but what it can tell you varies with the condition and the kind of variant present. 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 instead of certainty and is most helpful when considered with other parts of care. In other situations, a genetic result can give a clear answer. For areas like medication response, genetic results can help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or responds to it at the target tissue. This helps explain why the same treatment works well for one person, works less well for another, or causes more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can affect a person’s response to medications. It examines links between genes and drugs to better understand why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This information can help support more informed, individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the ARMC5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so general medication questions or health concerns are best discussed with your doctor or pharmacist.
History
ARMC5 entered medical genetics fairly recently, when researchers identified it in 2013 as a key gene linked to primary bilateral macronodular adrenal hyperplasia, a cause of cortisol excess in some families. This finding helped explain why the condition could run in families yet also worsen over time as adrenal nodules developed. From these first observations, research expanded steadily. Later studies showed that ARMC5 variants could also appear in some people with meningiomas, which widened interest in the gene beyond adrenal medicine. Over time, ARMC5 became recognized as an important part of the history of inherited adrenal conditions.