The DNM1L gene gives cells instructions for a protein that helps split mitochondria, the structures that make energy, and peroxisomes, which help process fats and remove certain toxins. This gene plays an important role in keeping brain, muscle, and nerve cells working well. When the DNM1L gene does not work properly, cells may struggle to manage energy and waste, which can lead to developmental delay, seizures, low muscle tone, movement problems, and vision issues. Some severe variants cause a rare condition that affects brain development and energy use throughout the body.
What is a gene?
Genes are sections of DNA that give cells instructions for making molecules or managing processes in the body. Some carry the code for proteins, which are the parts of cells that do much of the work. Others mostly regulate when certain activities happen, where they happen, and how active they are. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, and medications. More detail is available in the LearnHub.
Overview
DNM1LGene function
What if the gene works
The DNM1L gene helps mitochondria and peroxisomes split into the right size and number. This supports energy supply, cell growth, and the removal of worn out cell parts.
Risk
What if the gene does not work
Variants in the DNM1L gene can disrupt cell energy structures, often causing developmental delay, low muscle tone, and seizures. Effects can range from milder to more severe, influencing when symptoms begin and whether vision or heart problems occur.
Treatment
What does that mean for your treatment
At present, no treatment or drug choice strategy specific to the DNM1L gene is established in clinical guidelines. Research is exploring ways to adjust mitochondrial fission, the cell process influenced by the DNM1L gene, but this remains experimental and has not changed routine care.
Conditions associated with DNM1L
Gene function
What if the gene works
Your cells need a steady supply of small, well placed mitochondria to meet daily energy demands. The DNM1L gene helps split mitochondria and peroxisomes into manageable units your cells can move, share, and renew. This is a central part of how the DNM1L gene works in everyday cell function.
The DNM1L gene helps mitochondria divide into smaller parts. This keeps their size and number balanced, which supports steady energy use across the cell.
It also helps peroxisomes divide. These small cell compartments break down certain fats and help manage harmful byproducts, so regular splitting supports routine cell maintenance.
Smaller mitochondria are easier for cells to move and place where energy is needed most. This helps support active parts of a cell during normal growth and daily work.
When a cell divides, mitochondria and peroxisomes need to be shared between the two new cells. DNM1L supported splitting helps these structures be distributed more evenly.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can change the function of a gene more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DNM1L gene can change the shape or stability of the DRP1 protein, weaken its activity, or stop it from assembling properly on mitochondria and peroxisomes, which helps explain DNM1L gene variant effects. Some variants are milder and leave partial activity, while more disruptive variants can sharply reduce protein function or interfere with other DRP1 molecules. This range may influence how early symptoms linked to DNM1L appear and how severe neurologic features become.
How variants are linked to conditions
Pathogenic variants in the DNM1L gene cause a rare inherited condition often described as DNM1L-related developmental delay and seizures, and finding one can confirm the diagnosis. People with this condition may also have low muscle tone, movement problems, developmental regression, optic atrophy, or peripheral neuropathy. The picture can vary a lot, with some affected early in life and others having a milder presentation.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology and are widely found across the population. Most do not directly affect health and instead represent normal variation among people. For many genes, having a variant associated with a condition points to a possible link rather than a confirmed diagnosis, particularly when several genes and environmental influences play a role. In certain situations, though, one well-understood variant in a particular gene is enough to confirm the diagnosis.
Are there things that can increase or change my risk?
For DNM1L, risk is mainly linked to whether someone carries a disease-causing variant in the gene, and these changes are often new in the family rather than caused by lifestyle. There is not broadly confirmed evidence that everyday factors clearly increase or lower DNM1L-related genetic risk; people with concerns about personal or family risk can speak with a doctor or genetic counselor.
Inheritance of DNM1L variants
Most DNM1L gene variants linked to disease follow an autosomal dominant pattern, so one altered copy can be enough to cause a DNM1L-related condition. In practical terms, how DNM1L gene variants are inherited usually means an affected parent has a 50% chance of passing the variant to each child. This chance is the same for sons and daughters. Some cases happen because of a new (de novo) variant, which means the change was not inherited from either parent. The DNM1L gene is on chromosome 12, so it is not sex linked.
What does my DNM1L result mean for my family?
DNM1L can be linked to conditions that run in families in more than one way, so what it means for relatives depends on the exact result. In dominant forms, close family members may also carry the variant, though some cases happen for the first time in one child and are not inherited from a parent. In recessive forms, parents are often healthy carriers, and brothers or sisters may also be carriers or sometimes affected.
Genetic information
Genetic testing
How you find out about variants
Variants in the DNM1L gene are found with genetic testing for DNM1L variants, which reads DNA from a blood or saliva sample. Testing may examine only this gene or include many genes in a panel, exome, or genome test. Results show whether a variant is present and if it helps explain the person’s condition.
When should I consider getting a genetic test?
Consider testing for changes in the DNM1L gene when a child has unexplained developmental delay along with seizures, low muscle tone, movement problems, or vision loss, especially if similar problems run in the family. A DNM1L result can help confirm the cause of a suspected inherited brain and nerve condition.
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 involved. Over time, factors like lifestyle, environment, age, and medical history also shape how the body functions. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and makes most sense when considered with other parts of care. In other situations, a genetic result can give a clear answer. In 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 a person responds to medicines. Small differences in genes can change how the body breaks down a drug, moves it through the body, or how strongly the drug acts on its target. This helps explain why the same medication works well for one person, works less well for another, or causes more side effects in some people.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape the way a person responds to medications. It focuses on the relationship between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can affect how strongly a drug works or how the body handles it. This information can support more informed and more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the DNM1L gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response. Questions about side effects, new symptoms, or how your medicines fit with your overall health are best discussed with your doctor.
History
Researchers identified the DNM1L gene in the 1990s while studying a human relative of dynamin proteins that had already attracted attention in basic cell biology. Early work linked it to the control of mitochondrial shape, which helped shift the field toward the modern idea that mitochondria are constantly dividing and joining rather than staying static. Building on this early work, scientists uncovered more about the gene as microscopy and genetic tools improved. In the 2010s, DNM1L drew wider clinical interest after pathogenic variants were reported in children with developmental and neurologic conditions. Those reports made DNM1L part of a broader change in medicine, where rare gene findings began to connect everyday symptoms with changes in mitochondrial dynamics.