The TNFSF13 gene gives instructions for a signaling protein that supports B cells, the immune cells that make antibodies. This gene helps your body maintain longer-lasting antibody responses, so variants that reduce its activity may be linked to low antibody levels and repeated sinus, chest, or ear infections. Some people carrying a TNFSF13 gene change may also have shifts in immune balance that can play a role in autoimmune conditions, although effects can vary widely.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate processes in the body. Some genes provide the instructions for making proteins, the parts of cells that do much of the work. Other genes mainly direct when certain processes happen, where they take place, and how strongly they run. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. To explore this topic in more detail, you can learn more in the LearnHub.
Overview
TNFSF13Gene function
What if the gene works
The TNFSF13 gene helps support B cells, a type of immune cell. It helps some of these cells survive and mature into cells that make antibodies. This supports normal immune responses.
Risk
What if the gene does not work
Changes in the TNFSF13 gene can range from mild to more severe. They may reduce APRIL signaling, weakening support for B cells, antibody production, and plasma cell survival.
Treatment
What does that mean for your treatment
No treatment or management approach is currently established specifically for pathogenic or loss-of-function variants in the TNFSF13 gene. TNFSF13 is being studied as a drug target and biomarker in some immune conditions and blood cancers, but this has not led to routine gene-directed care.
Gene function
What if the gene works
Your immune system depends on clear signals to keep antibody making cells working in a balanced way. The TNFSF13 gene helps provide some of those signals, especially for B cells and plasma cells. It supports everyday immune defense by helping these cells stay alive, communicate, and make certain antibodies.
The TNFSF13 gene helps immune cells send survival and activity signals to one another. These signals help keep antibody responses organized during routine immune defense.
This gene helps support mature B cells, the white blood cells that can turn into antibody makers. It gives these cells cues that help them stay active and ready to respond.
The TNFSF13 gene helps plasma cells, which are long lived cells that release antibodies, stay in place and keep working. This is one of the main ways it supports ongoing immune protection.
Its signals help some B cells switch to making IgA, an antibody that protects body linings such as the gut and airways. This is part of what the TNFSF13 gene does in the immune system each day.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more significantly and may contribute to or directly cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the TNFSF13 gene can change the APRIL protein's shape, stability, or release from cells, which may weaken how it attaches to partner proteins and passes signals between immune cells. In descriptions of how TNFSF13 gene variants affect protein function, milder variants may only slightly reduce protein activity, while more severe variants can markedly lower protein production or make the protein fail to work properly. Some variants may also alter how long the protein lasts before it is broken down.
How variants are linked to conditions
Current evidence on TNFSF13 gene variants linked to conditions remains limited, and the TNFSF13 gene does not yet have a broadly confirmed link to one specific health condition. Anyone with a confirmed TNFSF13-related diagnosis should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are widely found in the general population. Most do not have a direct impact on health and instead reflect natural human diversity. For many genes, carrying a variant connected with a condition suggests a possible association rather than a definite diagnosis, especially when several genes and environmental factors also contribute. 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the TNFSF13 gene. If testing finds a change in TNFSF13, a doctor or genetic counselor can help explain what it may mean in the context of your personal and family history.
Inheritance of TNFSF13 variants
There is not yet a broadly confirmed Mendelian TNFSF13 inheritance pattern tied to one specific human condition, so TNFSF13 gene inheritance is not described in the same clear way as classic dominant or recessive conditions. Research is still evolving, and different TNFSF13 variants may not all have the same clinical meaning. The TNFSF13 gene is located on chromosome 17, which is an autosome, so you inherit one copy from each parent regardless of sex.
What does my TNFSF13 result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific TNFSF13-related condition for families to use in a clear-cut way. A TNFSF13 result does not automatically mean relatives will have the same health issues, and the family meaning depends on the exact result and the person’s medical history.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the TNFSF13 gene, genetic testing for TNFSF13 variants usually uses a blood or saliva sample. A lab reads the DNA sequence and checks for differences from the usual sequence, then reports whether a variant was found and whether it is known to be linked with disease.
When should I consider getting a genetic test?
There is not yet a broadly established reason to order genetic testing just for the TNFSF13 gene. Decisions about testing are usually based on your personal health history, symptoms, and family history, together with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it reveals depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body works over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when viewed alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can 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 handles a drug or how strongly the drug acts on its target, so the same treatment may work better for one person than another. This is common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. By looking at links between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This information can support more informed and individualized treatment decisions. More about this topic is available in the LearnHub.
Drugs influenced by the TNFSF13 gene
When should I seek medical advice?
There isn't yet a broadly confirmed role for this gene in predicting how medicines will work or what side effects they may cause. Questions about side effects, how well a treatment is working, or changes in your medicines are best discussed with your doctor.
History
The TNFSF13 gene was identified in the late 1990s during a period of rapid discovery of new immune system signaling genes. It was first described as APRIL, a name that reflected early laboratory findings and helped distinguish it within the tumor necrosis factor family. Initially understood only through visible traits, later recognized as tied to a specific gene, its place in immune research became clearer as scientists compared it with related family members. From these first observations, research expanded steadily. Over time, studies connected the TNFSF13 gene to B cell biology and to conditions involving abnormal immune activity, giving it a steady place in modern immunology and blood cancer research.