The TMEM106B gene helps control lysosomes, the cell parts that break down and recycle waste, especially in brain cells. The protein made by this gene helps your cells keep these recycling centers working at the right size and acidity. If the gene does not work properly, waste can build up and nerve cells may not function well, which can lead to developmental and movement problems in some people. Certain variants in the TMEM106B gene are also linked to differences in risk for a form of dementia called frontotemporal dementia.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells can use to make molecules or direct processes in the body. Some genes provide the information needed to produce proteins, the parts of cells that do much of the work. Other genes mainly regulate 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 medications. For a closer look at this topic, you can find more in the LearnHub.
Overview
TMEM106BGene function
What if the gene works
The TMEM106B gene helps cells manage lysosomes, the compartments that break down and recycle waste. This supports healthy protein handling and is especially important for nerve cells in the brain.
Risk
What if the gene does not work
More severe variants in the TMEM106B gene can cause childhood developmental delay, movement problems, and a condition affecting brain myelin, while milder variants may mainly influence frontotemporal dementia risk.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently based on a pathogenic or loss of function variant in the TMEM106B gene. The TMEM106B gene is being studied as a possible marker and treatment target in some neurodegenerative conditions because it appears to affect the cell's recycling system.
Conditions associated with TMEM106B
Gene function
What if the gene works
Inside your cells, the TMEM106B gene helps manage lysosomes, small compartments that break down and recycle used material. Understanding how the TMEM106B gene works helps explain how cells stay tidy and balanced over time. When this system runs smoothly, cells can clear debris, reuse parts, and support routine upkeep.
The protein made from the TMEM106B gene supports lysosomes as they break down used proteins and other cell material. This cleanup lets cells reuse useful building blocks and keep clutter from piling up.
This protein helps lysosomes keep the right size, shape, and internal conditions. That steady setup supports daily waste processing and normal cell maintenance.
The TMEM106B gene also supports the flow of material from cell sorting areas to lysosomes for breakdown. This keeps the recycling pathway moving in an orderly way.
The protein from the TMEM106B gene helps lysosomes move to the parts of the cell where cleanup is needed. Good positioning supports efficient recycling across the cell.
What is a variant?
A genetic variant is a slight change in the DNA sequence of a gene. These changes are common and help create normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can change the function of a gene more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
TMEM106B gene variants can change how much TMEM106B protein a cell makes, how stable it is, or how it behaves in lysosomes, the cell’s recycling compartments. This can leave lysosomes enlarged, less acidic, or less able to move and clear material in a controlled way. Some changes have milder effects, while more severe variants can disrupt these cell processes more strongly and, in established TMEM106B related conditions, may be linked to earlier or more pronounced neurologic features.
How variants are linked to conditions
Rare pathogenic variants in the TMEM106B gene can cause a form of hypomyelinating leukodystrophy, a condition that affects brain white matter and development. Other TMEM106B gene variants are linked to frontotemporal dementia risk and may influence age at onset, especially in forms with TDP-43 changes and in some people carrying GRN or C9orf72 variants. This summary of how TMEM106B variants are linked to conditions reflects both confirmed diagnoses and risk associations.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in 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 indicates a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors also play a part. In some situations, though, a single well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
Some TMEM106B changes are linked with a higher or lower chance of certain brain conditions, especially frontotemporal dementia, and they can also modify risk in people who already carry changes in other genes such as GRN. Age and family history still matter, and TMEM106B alone does not determine whether someone will develop disease.
Inheritance of TMEM106B variants
How TMEM106B gene variants are inherited depends on the type of variant and the condition involved. Rare disease-causing changes in the TMEM106B gene that lead to a childhood brain and nerve condition are inherited in an autosomal dominant pattern, so one altered copy can be enough, and each child of an affected parent has a 50% chance of inheriting it; some cases happen because of a new de novo variant. More common TMEM106B gene variants linked to adult brain disease risk are passed down through families too, but they do not follow a simple single-gene inheritance pattern.
What does my TMEM106B result mean for my family?
For TMEM106B, the best-established inherited condition is a rare brain and nerve condition caused by a change in one copy of the gene, so close relatives may also carry the same change and may wish to talk with their care team about whether family testing makes sense. In some families, the change is new in the affected child and is not found in either parent, so a TMEM106B result does not always mean it came from a parent. The meaning for relatives can differ from one TMEM106B result to another, because some findings in this gene are linked to risk rather than a definite inherited condition.
Genetic information
Genetic testing
How you find out about variants
Testing for changes in the TMEM106B gene is usually done with a blood or saliva sample. A lab reads the gene's DNA sequence to look for variants, often as part of a broader panel or exome test, so TMEM106B genetic testing can help clarify whether a reported change is present.
When should I consider getting a genetic test?
Testing may be considered when a child has unexplained developmental delay, low muscle tone, speech or movement problems, and a doctor suspects a rare TMEM106B-related condition. Common TMEM106B changes linked to dementia mostly affect risk and are not usually tested on their own.
A genetic result is only one part of your health story
A genetic result may offer useful insight, yet how much it can explain varies based on the condition and the type of variant present. Lifestyle, environment, age, and medical history, among other factors, also shape how the body functions over time. With some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment can work well for one person, cause side effects in another, or seem to have less effect in someone else.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes affect the way a person responds to medication. It examines gene and drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body handles it. This information can help support more informed, individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the TMEM106B gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines, so concerns about symptoms, side effects, or changes to your treatment are best discussed with your doctor.
History
The TMEM106B gene entered medical genetics in the late 2000s, when large genetic studies linked it to frontotemporal dementia, a form of dementia that can affect behavior and language. Initially understood only through visible traits, later recognized as tied to a specific gene, this finding helped researchers connect inherited risk with changes seen in brain disease. From these first observations, research expanded steadily. Over the next decade, studies explored how TMEM106B variants might shape risk and disease course, especially in people with other dementia related gene changes such as in the GRN gene. More recently, TMEM106B drew wider scientific attention after researchers identified TMEM106B protein fragments in age related brain deposits, adding a new chapter to its history.