The TGM5 gene helps make the outer layer of your skin strong and flexible by joining key skin proteins together. This gene helps your body maintain a sturdy skin barrier, so when it does not work well, some people develop repeated superficial skin peeling, most often on the hands and feet, especially after heat, sweating, friction, or water exposure. TGM5 is mainly known in dermatology rather than popular culture, so it has not had the public attention seen with genes such as BRCA1 or APOE.
What is a gene?
Genes are sections of DNA that provide cells with instructions to make molecules or to direct processes in the body. Some genes hold the instructions for producing proteins, the working parts of cells. Others are mainly involved in controlling when certain processes happen, where they happen, and how strongly they occur. Together, genes affect how the body develops and works, and they can shape your response to food, stress, or medications. To look at this topic in more detail, you can read more in the LearnHub.
Overview
TGM5Gene function
What if the gene works
The TGM5 gene helps skin cells form a tough outer layer. Its protein links skin proteins together, supporting the skin barrier and helping palms and soles handle friction.
Risk
What if the gene does not work
Pathogenic variants in both copies of the TGM5 gene can cause acral peeling skin syndrome, with painless peeling and blistering mainly on the hands and feet. Milder variants may lead to later onset or less extensive peeling.
Treatment
What does that mean for your treatment
No TGM5-specific treatment or drug selection approach is currently established; care for people with pathogenic variants in the TGM5 gene is supportive and usually centers on reducing friction, protecting skin, and using moisturizers to help limit peeling.
Conditions associated with TGM5
Gene function
What if the gene works
In your skin, the TGM5 gene supports the final steps that turn fresh skin cells into a strong outer barrier. Its protein helps outer skin cells connect their structural parts and become tougher as they move upward. This steady process helps skin stay intact during everyday friction, washing, and drying.
The TGM5 gene helps build the tough outer layer of skin. It strengthens skin cells near the surface so they can form a protective covering.
Its protein joins skin proteins together in a controlled way. This linking step helps the skin surface become firm, flexible, and better able to hold together.
TGM5 supports the last stage of skin cell maturation as cells move toward the surface. It helps these cells change from living cells into flat, durable outer cells that protect the body.
What is a variant?
Genetic variants are minor differences in a gene’s DNA sequence. They are common and help explain normal variation among people, including differences in appearance, metabolism, and the way the body reacts to environmental influences. Many do not cause any noticeable changes and are part of natural genetic diversity. Sometimes, though, a variant changes how a gene works more strongly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the TGM5 gene can change the shape of the transglutaminase 5 protein, make it unstable, or sharply reduce its activity, so skin cells are less able to link key surface proteins into a strong outer layer. In plain terms, this is how TGM5 gene variants affect protein function. Milder variants may leave some activity, while more severe variants can cause little or none, which often lines up with earlier onset or more noticeable peeling in acral peeling skin syndrome.
How variants are linked to conditions
Pathogenic variants in the TGM5 gene cause acral peeling skin syndrome, a skin condition where the top layer peels, most often on the hands and feet. This is the main well-established condition linked to TGM5 gene variants in human genetics. When a person has pathogenic variants in both copies of the gene, the finding can confirm the diagnosis.
A variant is not necessarily a diagnosis
Variants in genes are a usual part of human biology and are widespread in the general population. Most do not directly affect health and instead reflect normal human variation. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some situations, though, a single well understood variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For people with disease-causing changes in both copies of the TGM5 gene, the inherited gene changes are the main reason the skin condition happens. Heat, humidity, sweating, water exposure, and rubbing or friction can make peeling more likely or worse. These steps help prevent flare-ups and skin damage rather than change the genetic risk itself.
Inheritance of TGM5 variants
TGM5-related skin conditions are inherited in an autosomal recessive pattern. This means a person usually inherits one TGM5 variant from each parent before the condition develops. If both parents carry one variant in the TGM5 gene, each pregnancy has a 25% chance of resulting in a child with the condition, a 50% chance of resulting in a child who is a carrier, and a 25% chance of resulting in a child without the familial variants. In practical terms, TGM5 inheritance often appears in families with no prior history because carriers usually do not have symptoms.
What does my TGM5 result mean for my family?
For families with a disease-causing change in the TGM5 gene, close relatives may also be carriers, even if they have no skin symptoms. Brothers and sisters could be affected or carry the same gene change, and relatives planning children may want to know whether the change runs in the family. This pattern is usually autosomal recessive, so family implications are often most important for siblings and future children.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the TGM5 gene, a lab can analyze DNA from a blood sample, saliva, or a cheek swab. Genetic testing for TGM5 variants reads the gene’s code and looks for changes that may help explain peeling skin symptoms or confirm a suspected inherited skin condition.
When should I consider getting a genetic test?
Consider genetic testing for the TGM5 gene if you or your child has repeated, painless skin peeling on the hands and feet, especially starting in childhood, or if close relatives have had the same problem. Testing can help confirm the cause and show whether it may run in the family.
A genetic result is only one part of your health story
A genetic finding can provide useful information, but how much it explains depends on the condition and on the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For 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 such as medication response, genetic results can also help put individual experiences into perspective.
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 breaks down a drug, moves it through the bloodstream, or responds to it at its target. This helps explain why the same medication may work well for one person, work less well for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in a person’s genes can affect their response to medications. It studies gene and drug patterns 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 handles it. This information can support more informed, more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the TGM5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so any concerns about your health, skin symptoms, or how you respond to medicines are best discussed with your doctor.
History
In recent decades, awareness of the TGM5 gene’s role in skin health has grown. Researchers first identified the TGM5 gene as part of the transglutaminase family, a group of genes involved in building the outer skin barrier. A key step came in the 2000s, when studies linked variants in the TGM5 gene to acral peeling skin syndrome, helping explain why some families had lifelong peeling of the hands and feet. From these first observations, research expanded steadily. Scientists then described additional TGM5 variants in affected families from different countries, which confirmed the connection. These historical steps shaped today’s understanding of TGM5 as an established gene in inherited skin conditions.