The METTL3 gene helps cells place small chemical tags on RNA, the working copies of genes, so proteins are made at the right time and in the right amount. If it does not work well, cells may lose control of growth and development, and rare variants have been linked to developmental differences, including learning and growth problems. This gene plays an important role in early development and in how cells handle stress.
What is a gene?
Genes are pieces of DNA that carry instructions your cells use to make molecules or manage activities in the body. Some genes provide the directions for producing proteins, which do much of the cell’s work. Others mainly regulate when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a closer look at this topic, you can read more in the LearnHub.
Overview
METTL3Gene function
What if the gene works
The METTL3 gene helps place a small chemical tag on RNA messages after genes are read. This tag helps cells control how long messages last, how they are used to make proteins, and how cells grow and mature.
Risk
What if the gene does not work
Milder and more severe variants in the METTL3 gene can reduce a common chemical tag placed on RNA messages to different degrees. This may disrupt how cells control the timing, stability, and use of many genes.
Treatment
What does that mean for your treatment
At present, no treatment or management approach specific to the METTL3 gene is established for people with a pathogenic or loss-of-function variant. METTL3 is being studied as a possible drug target and biomarker in several cancers, but this has not yet led to guideline-based treatment choices.
Gene function
What if the gene works
Your cells constantly copy DNA instructions into RNA messages. The METTL3 gene helps place a small chemical mark called m6A (a common tag on RNA) on many of these messages. Understanding what the METTL3 gene does in your cells helps explain how RNA handling and protein production stay organized.
METTL3 adds m6A (a common chemical tag on RNA) to many RNA messages. This tag helps label messages so cells can manage them in an organized, timely way.
These RNA tags help newly made messages mature and move through the cell correctly. That supports key steps such as editing RNA pieces and preparing messages for use.
METTL3 linked tags help set how long some RNA messages stay available. This gives cells a controlled way to keep certain instructions brief and others around longer.
m6A marks placed by METTL3 can influence how efficiently some RNA messages are turned into proteins. This helps cells match protein production to everyday needs like growth and routine renewal.
What is a variant?
A genetic variant is a small change in a gene’s DNA sequence. These changes are common and help account for normal human differences, such as appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of 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
Changes in the METTL3 gene can alter how METTL3 gene variants affect protein function by reducing enzyme activity, making the protein less stable, or weakening its links with partner proteins that add a chemical tag to RNA. Milder variants may leave some activity in place, while more severe variants can sharply cut RNA marking or stop a working protein from being made. This can disrupt how cells process and use many RNA messages.
How variants are linked to conditions
Research on how variants in the METTL3 gene are linked to conditions is still developing, and no single condition linked to the METTL3 gene has broad confirmation at this stage. If you have a confirmed variant in the METTL3 gene, your doctor or genetic counselor can explain what it may mean in the context of your personal and family history.
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 also play a role. In some situations, though, one well-characterized variant in a particular gene is enough to confirm the diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the METTL3 gene. If a METTL3 result appears on genetic testing, its meaning often depends on the exact change and the health issue being evaluated, so personal risk is best discussed with a doctor or genetic counselor.
Inheritance of METTL3 variants
METTL3-related conditions are currently understood to follow an autosomal dominant inheritance pattern. If a parent carries a disease-causing variant in the METTL3 gene, each child has a 50% chance of inheriting it. Some people have a new (de novo) variant in the METTL3 gene, which means it arose for the first time in them rather than being passed down from either parent. For families looking into how METTL3 gene variants are inherited, this means the pattern can differ within a family depending on whether the variant was inherited or arose new.
What does my METTL3 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for METTL3, though this understanding can change as research develops. If you have a specific METTL3 result and questions about what it could mean for your family, a doctor or genetic counselor can explain whether relatives may also be affected or may carry the same change.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the METTL3 gene, a lab can analyze DNA from blood, saliva, or a cheek swab. This genetic testing for METTL3 variants compares the gene’s sequence with the usual version and may identify a benign variant, a variant of uncertain significance, or a pathogenic variant.
When should I consider getting a genetic test?
There is not yet a broadly established reason to get METTL3 testing on its own. Testing choices are usually made with a doctor or genetic counselor based on symptoms, family history, or whether METTL3 is being checked as part of a broader test for a rare genetic condition.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but how much it reveals depends on the condition and the specific type of variant. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most helpful when viewed alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, genetic results may help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same medication works well for one person, seems less effective for another, or causes more side effects in someone else. Part of the reason is that inherited differences can change how the body breaks down, moves, or responds to a drug, which can influence both benefit and sensitivity.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medicines. By studying links between genes and medications, it helps explain why the same treatment can work differently from one person to another. For many drugs, genes influence both how much effect a medicine has and how the body handles it. This information can support more informed, more personalized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the METTL3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choices, so questions about side effects, treatment response, or medication safety are best discussed with your doctor. Researchers are studying whether METTL3 may affect how some cancers respond to treatment, but this is not part of routine care yet.
History
The METTL3 gene entered modern genetics through research on a common RNA mark called m6A, which became a major focus in the 1990s. In 1997, researchers identified the human protein first called MT-A70, now known to be encoded by the METTL3 gene. From these first observations, research expanded steadily. During the 2010s, studies showed that METTL3 was a core part of the machinery that adds m6A marks to RNA, helping establish the field of epitranscriptomics, the study of chemical changes on RNA. As this area grew, the METTL3 gene became important in research on development, cancer, and cell behavior. Its history reflects a broader shift in genetics from studying DNA alone to understanding how RNA is also regulated.