The EHMT1 gene helps control when other genes are switched on or off, especially during brain development and early growth. This gene plays an important role in how cells support learning, muscle tone, and development. When one copy is not working properly, it can cause Kleefstra syndrome, which often includes developmental delay, intellectual disability, low muscle tone, and limited speech. Some people also have sleep problems, seizures, or heart differences.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate processes in the body. Some genes provide the information needed to produce proteins, the parts of cells that do the work. Other genes mainly direct when certain processes happen, where they occur, and how strongly they run. Together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. To explore this topic in more detail, you can find more in the LearnHub.
Overview
EHMT1Gene function
What if the gene works
The EHMT1 gene helps cells control which other genes are turned on or off. This supports normal brain development, growth, and the way many tissues mature and work.
Risk
What if the gene does not work
Variants in the EHMT1 gene can cause Kleefstra syndrome, often with developmental delay, limited speech, low muscle tone, and intellectual disability. Milder and more severe variants can affect how early features appear and how strongly learning and behavior are affected.
Treatment
What does that mean for your treatment
No treatment or drug choice aimed specifically at a pathogenic variant in the EHMT1 gene is currently established. Care is based on the person’s symptoms and support needs rather than on a targeted medicine, although the EHMT1 gene is being studied in early stage research on brain development and epigenetic treatments.
Conditions associated with EHMT1
Gene function
What if the gene works
In daily life, the EHMT1 gene helps your cells keep the right genes active at the right time. It makes a protein that places small chemical tags on histones, the proteins that help package DNA. These tags help organize genetic instructions and support steady cell function.
The EHMT1 gene helps cells decide which genes are active and which stay quiet. Its protein places small chemical tags called methyl groups on histones, the proteins that package DNA. This helps keep gene activity orderly.
By tagging histones, EHMT1 helps shape chromatin (the bundled form of DNA and its proteins). This packaging makes some stretches of DNA easier or harder for the cell to read. Understanding EHMT1 gene function helps explain how cells use the same DNA in different ways.
Many cells use EHMT1 to keep stable patterns of gene activity as they grow and mature. That supports development and helps a skin cell stay a skin cell while a nerve cell keeps its own job.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help create normal human diversity, such as variations in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. Sometimes, 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 EHMT1 gene can weaken or block how the protein adds small chemical tags to packaging proteins around DNA, a step cells use to control gene activity. More severe variants, such as whole gene losses or changes that create a shortened protein, often leave little or no working protein, while some missense variants only partly reduce activity or important protein binding. This helps explain how EHMT1 gene variants affect protein function and why effects can vary.
How variants are linked to conditions
Pathogenic variants or deletions involving the EHMT1 gene cause Kleefstra syndrome, a condition that usually includes developmental delay, intellectual disability, low muscle tone, and limited speech. Some people also have features of autism, seizures, sleep problems, or differences affecting the heart or kidneys. When people read about the EHMT1 gene and Kleefstra syndrome, it helps to know that features can vary widely from person to person.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common throughout the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors also contribute. In some situations, though, one well described variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For EHMT1-related Kleefstra syndrome, risk is mostly determined by whether a disease-causing change in the EHMT1 gene is present. Many cases happen for the first time in a child, but if a parent carries the change, the chance in each pregnancy is much higher. Lifestyle or environmental factors are not known to meaningfully change this risk.
Inheritance of EHMT1 variants
The inheritance of the EHMT1 gene variants linked to Kleefstra syndrome is usually autosomal dominant. This means a person needs one disease-causing EHMT1 gene variant to have the condition, and an affected parent can pass it to each child with a 50% chance. Many people with an EHMT1-related condition are the first in their family to have it because the variant happened new (de novo) in them rather than being inherited from either parent.
What does my EHMT1 result mean for my family?
For EHMT1, the main family pattern is dominant, so a parent, brother, sister, or child could sometimes carry the same change. In many families, though, the EHMT1 change happened new in the affected person and was not inherited from either parent. Because of that, what this means for relatives depends on whether the variant was inherited or arose for the first time.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for the EHMT1 gene uses a blood or saliva sample to read the gene's DNA and look for variants. If you want to know how to find out about variants in the EHMT1 gene, testing can show whether a change is present, but the result still needs medical interpretation to understand what it means.
When should I consider getting a genetic test?
Genetic testing for the EHMT1 gene may be worth considering when a child has significant developmental delay, very low muscle tone, speech delay, or signs that suggest Kleefstra syndrome. It can also help if there is a family history of the condition or a related chromosome change.
A genetic result is only one part of your health story
Genetic findings can provide useful insight, but what they show depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most helpful when considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, these results can also help place personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Some people break down a drug more slowly or more quickly than expected, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person but not as well for another, even at the same dose. These differences are common and can influence both how well a medicine works and the chance of side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. It looks at relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body handles it. This information can support more informed, more individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the EHMT1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines work, so any concerns about side effects, new symptoms, or how a treatment fits with your overall health are best discussed with your doctor.
History
Clinicians first recognized a pattern of developmental differences and distinctive facial features in some children before the genetic cause was clear. Initially understood only through visible traits, later recognized as tied to a specific gene, this condition was described as the 9q subtelomeric deletion syndrome in the early 2000s. In 2006, researchers showed that changes involving the EHMT1 gene were the key cause, which led to the condition being renamed Kleefstra syndrome after Dutch physician Tjitske Kleefstra. Building on this early work, scientists uncovered more about the gene and found that both deletions and smaller EHMT1 variants could lead to a similar clinical picture. Over time, this helped families receive a more specific diagnosis and gave doctors a clearer way to group related findings.