The TMEM39A gene helps cells handle proteins within their internal membrane system and may support normal immune activity. If it does not work properly, cells may cope less well with stress, which can affect inflammation and other immune responses. Many variants are harmless, while a few may change how the gene works and are linked to a higher chance of autoimmune conditions such as multiple sclerosis or lupus. These variants influence risk rather than acting as a diagnosis on their own.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate activities in the body. Some genes carry the code for proteins, the working parts of cells. Others mainly control when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, and medications. You can learn more about this topic in the LearnHub.
Overview
TMEM39AGene function
What if the gene works
The TMEM39A gene helps cells manage protein handling inside the endoplasmic reticulum, a cell compartment that folds and moves proteins. It also appears to support normal cellular transport and stress responses.
Risk
What if the gene does not work
Reduced TMEM39A function can disturb protein handling and transport inside the endoplasmic reticulum, the cell’s protein processing compartment. Milder variants may partly reduce this activity, while more severe variants can cause a greater loss of normal intracellular trafficking, including collagen export.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by pathogenic or loss-of-function variants in the TMEM39A gene.
Gene function
What if the gene works
TMEM39A helps your cells handle a routine but important job: moving newly made proteins to the right place. This matters in the cell’s internal shipping system, where proteins are folded, packed, and sent onward. Its activity supports smooth protein traffic and the normal release of some large structural proteins, including collagen.
TMEM39A helps move selected proteins from the endoplasmic reticulum (the cell area that folds proteins) toward the Golgi apparatus, where they are prepared for delivery. This is a key part of how the TMEM39A gene helps move proteins through cells.
This transport role is especially important for collagen, a major building material in skin, bone, and other tissues. By supporting collagen export, TMEM39A helps cells maintain normal tissue structure.
What is a variant?
A genetic variant is a minor difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and the way the body responds to environmental influences. Many do not produce any noticeable effect and are simply part of natural genetic variation. At times, though, a variant can change how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Changes in the TMEM39A gene can change how the protein folds, how stable it is, or how well it interacts with other proteins in the cell’s transport system. In practical terms, this is how TMEM39A gene variants may affect protein function at the cellular level. Some variants appear milder and may only slightly reduce activity, while more severe variants can greatly lower the amount of working protein or disrupt key membrane-spanning parts, leading to stronger effects on intracellular trafficking and cell stress responses.
How variants are linked to conditions
Variants in the TMEM39A gene have been linked to autoimmune conditions, especially multiple sclerosis and systemic lupus erythematosus, in human genetic studies. Current evidence on TMEM39A gene variants and autoimmune disease risk suggests these changes may slightly influence a person's chance of developing these conditions at a population level. These associations do not confirm a diagnosis and are not used on their own to predict who will become ill.
A variant is not necessarily a diagnosis
Gene variants are a normal part of human biology and are common throughout the general population. Most do not have a direct effect on 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 several genes and environmental factors contribute. In some cases, 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 clearly increase or reduce risk related to TMEM39A. Changes in this gene are mainly studied as small influences on the chance of certain immune-related conditions, and overall risk still depends on many other genes and life factors.
Inheritance of TMEM39A variants
There is not yet a broadly confirmed Mendelian inheritance pattern tied to a specific TMEM39A-related condition. Current findings mostly link variants in the TMEM39A gene to shifts in disease risk rather than a single inherited syndrome, so how TMEM39A gene variants are inherited in a disease-causing sense is not defined in the usual dominant or recessive way. The TMEM39A gene is on chromosome 3, which is an autosome, so you inherit one copy from each parent.
What does my TMEM39A result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific condition for TMEM39A. Some changes in this gene have been studied as part of health risk, but a TMEM39A result usually does not give a clear, predictable meaning for relatives in the way some single-gene conditions do.
Genetic information
Genetic testing
How you find out about variants
Testing for TMEM39A variants is done with a DNA sample, usually saliva or a blood draw, which a lab reads to look for changes in the TMEM39A gene. TMEM39A genetic testing may be included in a broader panel rather than ordered on its own, and results describe whether a variant was found and how clearly it is linked to health.
When should I consider getting a genetic test?
There is not yet a broadly established, TMEM39A-specific reason for genetic testing in routine care. Testing decisions are usually best made with a doctor or genetic counselor, based on your personal health history, symptoms, and family history.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains varies by the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most helpful when 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 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 the body’s instructions can change how a drug is absorbed, broken down, or used, so the same treatment may work well for one person but less well for another. These differences are common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect the way people respond to medications. It focuses on patterns between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support more informed, individualized treatment decisions. You can learn more about this topic in the LearnHub.
Drugs influenced by the TMEM39A gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or use. If you have concerns about your health, side effects, or whether a treatment is working as expected, talk with your doctor or pharmacist.
History
TMEM39A entered the medical literature through gene mapping and large DNA studies rather than through a single dramatic discovery. In recent decades, awareness of this gene’s role has grown as research linked it to inherited susceptibility in immune related conditions, especially multiple sclerosis and systemic lupus erythematosus. Early interest came from genome wide association studies, which scan many genes at once to look for patterns shared by people with a condition. From these first observations, research expanded steadily. TMEM39A remains better known within genetics research than in public health discussions, but its history reflects how modern studies can bring previously overlooked genes into view.