The TXNRD2 gene helps cells limit damage from unstable oxygen molecules, especially inside mitochondria, the parts of cells that make energy. This gene plays an important role in protecting high energy tissues such as the heart and adrenal glands. If it does not work properly, cells can be injured more easily, and some people develop inherited conditions such as dilated cardiomyopathy or problems with adrenal hormone production. Most variants in the TXNRD2 gene do not cause disease.
What is a gene?
A gene is a section of DNA that carries instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for making proteins, which are the parts of cells that do much of the work. Other genes are mainly involved in controlling when certain processes happen, where they happen, and how active they are. Taken together, genes affect how your body grows 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
TXNRD2Gene function
What if the gene works
Your cells use the TXNRD2 gene to help control harmful oxygen byproducts inside mitochondria, the cell’s energy centers. This supports energy production and helps protect tissues such as the heart from oxidative stress.
Risk
What if the gene does not work
More disruptive variants in the TXNRD2 gene can impair the heart’s stress defenses and are linked to dilated cardiomyopathy; some people also develop adrenal gland problems with low cortisol. Milder variants may have smaller effects.
Treatment
What does that mean for your treatment
No treatment or management approach is currently tailored specifically to pathogenic variants in the TXNRD2 gene. Care follows the standard treatment used for the condition a person has. The TXNRD2 gene is being studied as a marker of cell stress and as a possible drug target in heart disease and some cancers, but this has not led to guideline based treatment choices.
Conditions associated with TXNRD2
Gene function
What if the gene works
Your cells use the TXNRD2 gene to manage normal chemical stress inside mitochondria, the parts of the cell that make energy. This steady cleanup work supports healthy energy production and helps other proteins stay in the right working state.
The TXNRD2 gene helps maintain redox balance, a normal chemical state that lets mitochondria work smoothly. It passes electrons to helper molecules so routine cell reactions stay controlled.
Its protein refreshes thioredoxin, a small helper in the cell’s natural antioxidant system. This is a key part of TXNRD2 gene function in mitochondria, where energy making creates reactive oxygen byproducts.
By keeping the mitochondrial environment stable, the TXNRD2 gene supports steady energy production. It helps important proteins stay in the right chemical form for routine work inside the cell.
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, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. Sometimes, 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 TXNRD2 gene can change how well its mitochondrial enzyme keeps its shape, accepts and passes electrons, or remains stable inside the cell. In practical terms, how TXNRD2 gene variants affect protein function depends on the change: milder variants may partly reduce enzyme activity, while more severe variants can sharply lower activity or stop the protein from working at all. These differences can lead to a range of disruption in mitochondrial redox control, with variable downstream effects on vulnerable cells.
How variants are linked to conditions
Pathogenic variants in the TXNRD2 gene cause familial glucocorticoid deficiency, a rare inherited form of primary adrenal insufficiency in which the body does not make enough cortisol. The clearest finding on TXNRD2 gene variants and adrenal insufficiency involves rare inherited variants seen in families rather than common gene changes. Some reported families have also had heart muscle disease, including dilated cardiomyopathy, although this is less consistently seen.
A variant is not necessarily a diagnosis
Variants in genes are a usual part of human biology and are widely found in the general population. Most have no direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant connected with a condition indicates a possible association rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific 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 TXNRD2 gene. If a change in TXNRD2 has been found in your family or on a test, a doctor or genetic counselor can help explain what it may mean for your personal risk.
Inheritance of TXNRD2 variants
When TXNRD2-related disease is confirmed, the inheritance pattern is autosomal recessive. This means a child inherits one altered copy of the TXNRD2 gene from each parent, and parents who each carry one variant are usually unaffected themselves. With this pattern, each pregnancy has a 25% chance of resulting in a child with the condition, a 50% chance of a child who is a carrier, and a 25% chance of a child with no familial variant. This is the main answer to how TXNRD2 variants are inherited in families.
What does my TXNRD2 result mean for my family?
For TXNRD2, the clearest established family pattern is recessive, which usually means parents are healthy carriers and brothers or sisters could also have the same condition or be carriers. Close relatives may also carry the family variant even if they feel well. What this means in practice depends on the exact TXNRD2 result and the condition linked to it in your family.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for TXNRD2 variants usually uses a blood sample, saliva, or a cheek swab. A lab reads the DNA code in the TXNRD2 gene to look for changes that may help explain an inherited heart condition or a family history of one.
When should I consider getting a genetic test?
Testing for the TXNRD2 gene may be considered when a child or family has a rare inherited form of adrenal gland failure, especially low cortisol without another clear cause. It can also help if this condition seems to run in the family. A genetics specialist can explain whether TXNRD2 testing fits the 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 depends on both the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, particularly those shaped by many genes, genetic information offers context rather than certainty and makes the most sense when viewed alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results can also help put individual experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes 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. 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 differences in genes can affect the way people respond to medicines. It studies links between genes and drugs to help explain why the same treatment may work differently in different people. With many medications, genes can influence either how strong a drug’s effects are or how the body handles it. This information can support treatment decisions that are both better informed and more individualized. To explore this topic in more detail, you can learn more in the LearnHub.
Drugs influenced by the TXNRD2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about side effects, treatment changes, or your overall health are best discussed with your doctor.