The DNM2 gene gives your cells instructions for dynamin 2, a protein that helps pinch off tiny membrane sacs and move materials inside cells. This gene plays an important role in keeping muscle and nerve cells working smoothly, so harmful variants can lead to muscle weakness, delayed motor skills, foot drop, numbness, or other nerve problems. Certain variants in the DNM2 gene are linked to centronuclear myopathy and some forms of Charcot-Marie-Tooth disease.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some provide the directions for building proteins, which are the parts of cells that do much of the work. Others are involved mainly in controlling 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 influence how you respond to food, stress, and medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
DNM2Gene function
What if the gene works
The DNM2 gene helps your cells pinch off tiny membrane pockets to bring materials inside. It also supports membrane shaping and movement within cells, helping with growth, cell signaling, and repair.
Risk
What if the gene does not work
Variants in the DNM2 gene can cause inherited muscle weakness, often centronuclear myopathy, or a peripheral nerve condition such as Charcot-Marie-Tooth disease. Milder and more severe variants can influence when symptoms start and whether muscle or nerve problems predominate.
Treatment
What does that mean for your treatment
No DNM2-specific treatment or drug-selection approach is currently established in clinical guidelines for people with pathogenic variants in the DNM2 gene. The DNM2 gene is being studied as a therapeutic target in centronuclear myopathy, including approaches that aim to lower DNM2 activity or amount, but these remain investigational.
Conditions associated with DNM2
Gene function
What if the gene works
Inside many kinds of cells, the DNM2 gene helps membranes bend, pinch, and move in a controlled way. This supports everyday jobs such as bringing materials in from the cell surface, recycling used parts, and finishing cell division. It is a good example of what the DNM2 gene does to keep cells organized and responsive.
The DNM2 gene helps cells pull in small packets from their surface. It tightens the neck of these packets so they can pinch off and move inward.
Cells constantly reshape small areas of membrane as they sort and move materials. DNM2 supports this by helping form the narrow curves and pinch points needed for controlled membrane change.
After nutrients or signals are taken in, parts of the cell surface need to be reused. DNM2 helps return membrane pieces and receptors to the places where cells need them.
When one cell finishes dividing into two, a thin connection still links them for a short time. DNM2 helps complete that final split so each new cell separates cleanly.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help create normal human diversity, such as variation in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. In some situations, though, a variant can change a gene’s function more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DNM2 gene can alter the protein’s shape, membrane binding, and self-assembly, so cells may not pinch off membrane packets in a controlled way. This is how variants in the DNM2 gene affect protein function: some changes make dynamin 2 too active, while others reduce stability or disrupt interactions. Milder variants may leave partial activity, while more severe variants can cause a bigger functional shift and are often linked to earlier or pronounced DNM2-related muscle or nerve disease.
How variants are linked to conditions
Pathogenic variants in the DNM2 gene are best known for causing autosomal dominant centronuclear myopathy, so DNM2 gene variants and centronuclear myopathy are a well-established link in human genetics. Other DNM2 variants are associated with inherited peripheral nerve conditions in the Charcot-Marie-Tooth spectrum, which can affect strength and feeling in the hands and feet. Different variants tend to be linked to different patterns of muscle or nerve involvement.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are common across the general population. Most do not directly affect health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some situations, however, a single well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For DNM2, the main factor is whether you inherited a disease-causing variant in the gene, and symptoms can vary even within the same family. There is not yet broadly confirmed evidence that specific lifestyle or environmental factors clearly increase or lower risk related to DNM2.
Inheritance of DNM2 variants
For families asking how variants of the DNM2 gene are inherited, the best-established pattern is autosomal dominant. This means a parent with a disease-causing DNM2 variant has a 50% chance of passing it to each child, regardless of sex. Some DNM2-related conditions, including certain forms of centronuclear myopathy, can also begin from a new (de novo) variant that was not inherited from either parent. Once a new variant is present in a person, it can then be passed on to their children in the same autosomal dominant way.
What does my DNM2 result mean for my family?
Changes in the DNM2 gene are usually passed down in a dominant way, so close family members such as parents, brothers, sisters, and children may also carry the same change and may want to learn whether it affects them. If a parent carries the variant, each child has a 1 in 2, or 50%, chance of inheriting it. Some DNM2 changes happen for the first time in one person, so a positive result does not always mean a parent has it.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for DNM2 variants usually uses a blood or saliva sample. A lab reads the DNA code with sequencing to look for changes in the DNM2 gene and may compare results with known disease linked variants. Results can show whether a variant is present, but they do not predict exactly how symptoms may unfold.
When should I consider getting a genetic test?
Consider testing the DNM2 gene if there is unexplained muscle weakness, delayed motor milestones, or a family history of centronuclear myopathy, a rare inherited muscle condition. It may also help when several relatives have an inherited nerve condition causing foot drop, numbness, or hand weakness.
A genetic result is only one part of your health story
A genetic test result can provide useful information, but how much it reveals depends on the condition being considered and the type of variant found. How the body functions over time is also shaped by many other 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 most helpful when viewed alongside 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 context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body absorbs, breaks down, transports, or responds to a drug, so the same treatment may work better for one person than for another. This is common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect their response to medicines. By studying links between genes and medications, it helps explain why the same treatment may work differently from one person to another. For many drugs, genes can influence how strong the effect is or how the body handles the medicine. This information can support treatment decisions that are more informed and more individualized. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the DNM2 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 concerns about side effects, new symptoms, or how a treatment is affecting you are best discussed with your doctor.
History
DNM2 entered medical genetics through basic cell biology research in the late 1980s and early 1990s, when scientists identified dynamins as a family of proteins involved in how cells handle their outer membrane. The DNM2 gene was then mapped and studied as the widely active member of this family in human tissues. Building on this early work, scientists uncovered more about the gene when inherited DNM2 variants were linked in the 2000s to centronuclear myopathy and later to some forms of Charcot-Marie-Tooth neuropathy. Those findings helped connect long observed muscle weakness and nerve symptoms in families to a specific genetic cause. Since then, DNM2 has remained an important gene in research on inherited muscle and nerve conditions.