The TMEM63B gene helps make a cell membrane protein that is thought to let cells sense pressure and shifts in fluid balance, especially in the brain. The protein made by this gene helps your cells respond to stretch and other physical changes in their surroundings. If a harmful variant disrupts this job, brain development and nerve signaling may be affected. Some people with TMEM63B-related conditions have developmental delay, low muscle tone, movement differences, or seizures.
What is a gene?
Genes are sections of DNA that give your cells instructions for making molecules or regulating activities in the body. Some genes carry the information needed to make proteins, which are the parts of cells that do the work. Others mainly direct when certain processes take place, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medicines. For a deeper look at this topic, you can read more in the LearnHub.
Overview
TMEM63BGene function
What if the gene works
The TMEM63B gene helps make a channel protein that lets charged particles move across cell membranes. This helps cells, especially nerve cells, respond to stretch and changes in fluid balance.
Risk
What if the gene does not work
Certain variants in the TMEM63B gene are linked to developmental delay, low muscle tone, movement differences, and seizures in some people. Effects can range from milder learning and movement problems to earlier, more complex symptoms, depending on the variant.
Treatment
What does that mean for your treatment
Pathogenic variants in the TMEM63B gene do not currently have a gene-specific treatment or guideline-based drug approach. TMEM63B is being studied in early laboratory research as an ion channel that could become a future drug target.
Gene function
What if the gene works
Inside many cells, the TMEM63B gene helps sense physical changes in the surrounding environment. It gives instructions for a membrane protein that responds to stretch and shifts in water balance. This lets cells turn those changes into internal signals and stay better adjusted during daily stress.
TMEM63B helps cells detect when their membrane is stretched or when water balance shifts. This is part of how the TMEM63B gene helps cells respond to swelling and other physical stress.
Its protein forms a channel that can open when the cell feels physical force or changes in water pressure. When open, it lets charged particles move across the membrane so the cell can pass along a signal.
By linking swelling to ion flow, this gene supports normal control of cell volume. That helps cells stay steady as fluid conditions change from moment to moment.
What is a variant?
A genetic variant is a minor change in the DNA sequence of a gene. These changes are common and help shape normal human diversity, such as differences in 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 cases, 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 TMEM63B gene can change how the channel protein opens, closes, or moves ions across the cell membrane. Some TMEM63B gene variants affect ion channel function only mildly, while others more strongly alter the protein's shape or make the channel easier or harder to activate. In people with disease-causing variants, larger functional changes are often linked to earlier onset and more marked neurologic features.
How variants are linked to conditions
TMEM63B does not yet have a broadly confirmed link to a specific health condition, though research on TMEM63B gene changes linked to disease is still developing. If you carry a TMEM63B variant, its meaning depends on the exact change and your overall clinical picture, so interpretation is best done with your doctor or genetic counselor.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal part of human biology. Most do not directly affect health and simply contribute to natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, particularly when more than one gene and environmental factors play a role. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risks related to the TMEM63B gene. Anyone with concerns about their personal or family risk can speak with a doctor or genetic counselor.
Inheritance of TMEM63B variants
TMEM63B gene inheritance for the currently recognized TMEM63B-related condition is autosomal dominant. This means a person needs one disease-causing variant in one copy of the TMEM63B gene to have the condition, and an affected parent can pass it to each child with a 50% chance. Many reported cases appear to result from a new, de novo variant, which means the change happened for the first time in the child and was not inherited from either parent. Sons and daughters can inherit it equally.
What does my TMEM63B result mean for my family?
A harmful change in the TMEM63B gene is usually linked to a dominant pattern, so close relatives such as parents, brothers, sisters, and children may also carry the same change and may want to discuss family testing. In many families reported so far, the change happened new in the affected child rather than being passed down from a parent. That means a parent does not always have TMEM63B just because a child does.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the TMEM63B gene, testing for TMEM63B variants analyzes DNA from a blood sample, saliva, or a cheek swab. The lab reads the gene's sequence and compares it with the usual pattern to identify changes that may help clarify a diagnosis.
When should I consider getting a genetic test?
Genetic testing may be worth discussing if a child has unexplained developmental delay, seizures, low muscle tone, or unusual movements, especially when doctors suspect a rare condition affecting the brain. TMEM63B is usually checked as part of a broader gene panel for epilepsy or developmental conditions, rather than as a single-gene test.
A genetic result is only one part of your health story
Genetic test results can be informative, but how much they reveal varies by the condition and the specific type of variant. Over time, how the body functions is shaped by many other factors too, 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 useful when viewed together with 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 your body responds to medicines. Small differences in genes can change how a drug is broken down, how strongly it acts in the body, or how likely side effects are. This helps explain why the same medication may work well for one person but less well for another. These differences are common and can influence both treatment benefit and sensitivity to a medicine.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medications. It studies 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 both how the body processes a drug and how strong its effects are. 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 TMEM63B gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choice, so questions about side effects, new symptoms, or how your medicines may affect you are best discussed with your doctor or pharmacist.
History
In recent decades, awareness of the TMEM63B gene’s role has grown. TMEM63B emerged from large-scale gene discovery efforts during the modern DNA sequencing era, when many previously little-known genes were first cataloged and named. From these first observations, research expanded steadily, and scientists began connecting TMEM63B to human health through clinical genetic studies. Reports in the 2020s brought wider medical attention after rare, harmful variants were identified in people with shared developmental and neurologic features. Over time, descriptions became more precise as more families were studied. The way this gene was viewed has shifted over time, moving from an obscure cataloged gene to one with clearer clinical importance.