The TMEM91 gene makes a membrane protein that helps cells move and handle important materials inside the body. The protein made by this gene helps your cells keep key internal compartments working smoothly. If the TMEM91 gene is not working well, these transport steps can be disrupted, which may affect normal development and how the brain and nerves function. Rare inherited variants in the TMEM91 gene have been linked to developmental delay and other neurologic features in some people.
What is a gene?
Genes are sections of DNA that give your cells instructions to make molecules or manage processes in the body. Some genes carry the directions for producing proteins, the parts of cells that do the work. Other genes mainly regulate when certain processes take place, where they occur, and how strongly they run. Taken together, genes affect how the body develops and works, and they can shape how you respond to food, stress, and medications. To go into this topic in more detail, you can find more in the LearnHub.
Overview
TMEM91Gene function
What if the gene works
The TMEM91 gene makes a membrane protein found mainly in the Golgi, the cell’s sorting center. It likely helps cells with routine protein processing and transport.
Risk
What if the gene does not work
Milder to more severe variants in the TMEM91 gene may partly reduce or fully disrupt the TMEM91 protein. This can alter normal membrane functions inside cells, especially how proteins move through and are handled by internal cell compartments.
Treatment
What does that mean for your treatment
At present, a pathogenic or loss-of-function variant in the TMEM91 gene does not have an established TMEM91-specific treatment or drug choice approach in current clinical guidelines.
Gene function
What if the gene works
Inside your cells, the TMEM91 gene helps make a protein that sits in internal cell membranes. It is most closely linked with the Golgi apparatus, the cell’s sorting and shipping center for proteins. That gives a practical picture of what the TMEM91 gene does in the body from day to day.
TMEM91 is linked to normal activity in the Golgi apparatus, where cells process and route proteins. This helps keep routine protein handling organized inside the cell.
Its protein is built into cell membranes, which supports the movement of materials between small compartments inside cells. This fits with a role in steady, everyday protein sorting and delivery.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and help explain normal variation among people, such as appearance, metabolism, or the way the body reacts to environmental influences. Many do not cause any noticeable effects and are part of natural genetic diversity. In some situations, though, a variant changes how a gene works more significantly and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the TMEM91 gene can change the protein's shape, stability, or placement in cell membranes. In practical terms, this is how variants in the TMEM91 gene affect protein function: milder changes may leave some activity intact, while more severe variants can shorten the protein or lead to very little working protein being made. These differences can alter how TMEM91 interacts with other cell components.
How variants are linked to conditions
Variants in the TMEM91 gene do not yet have a broadly confirmed link to a specific health condition, although research on TMEM91 gene variants and disease is still developing. If you have a reported TMEM91 variant or a TMEM91-related diagnosis, your doctor or genetic counselor can explain what that result may mean for you and your family.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of being human and are common throughout the general population. Most have no direct impact on health and simply represent natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when multiple genes and environmental factors contribute. In some situations, though, one well-characterized variant in a particular gene can be 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 risk related to the TMEM91 gene. If a TMEM91 change is found on testing, its meaning often depends on the exact change and the person’s overall medical and family history.
Inheritance of TMEM91 variants
There is not yet a broadly confirmed disease specific inheritance pattern for the TMEM91 gene, so TMEM91 gene inheritance is not described as a clearly established autosomal dominant, autosomal recessive, or X linked condition at this time. TMEM91 is located on an autosome, which means each person inherits one copy of the gene from their mother and one copy from their father. As research develops, the inheritance picture for TMEM91 may become clearer.
What does my TMEM91 result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific health condition for TMEM91. If you have a TMEM91 result and want to understand what it could mean for your relatives, a genetics specialist can explain it in the context of your exact finding and family history.
Genetic information
Genetic testing
How you find out about variants
TMEM91 genetic testing usually uses a blood or saliva sample, and how TMEM91 genetic testing works is simple: a lab reads the DNA sequence and checks for variants. Results may show a clearly relevant variant, no significant change, or a variant of uncertain significance, which is a DNA difference that is not yet fully understood.
When should I consider getting a genetic test?
There is not yet a broadly established, TMEM91-specific clinical reason for genetic testing. Testing decisions are usually based on your symptoms, family history, and whether a doctor or genetic counselor thinks a broader genetic test could be helpful.
A genetic result is only one part of your health story
Genetic results can provide valuable insight, but how much they reveal depends on the condition and the specific type of variant. How the body functions over time is also shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may offer 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 DNA can change how the body absorbs, breaks down, transports, or responds to a drug, so the same treatment may work well for one person but less well for another. These inherited differences are common and can influence both how helpful a medicine feels and how sensitive someone may be to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. It studies patterns between genes and drugs to help explain why the same treatment can 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 support more informed, individualized treatment decisions. You can explore this topic in more detail in the LearnHub.
Drugs influenced by the TMEM91 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so questions about side effects, new symptoms, or how medicines may affect you are best discussed with your doctor.