The DSG1 gene helps make a protein that acts like a strong glue between skin cells in the outer layer of the skin. When it does not work properly, skin cells can separate too easily and the skin barrier becomes weaker. This gene can play a role in how your body responds to everyday friction, heat, and germs. Some people with disease-causing variants in the DSG1 gene may have flaky or inflamed skin, thick skin on the palms and soles, or, in some cases, severe skin inflammation with allergies.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or managing activities in the body. Some genes hold the code for proteins, which do much of the cell’s work. Other genes are used mainly to regulate when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
DSG1Gene function
What if the gene works
The DSG1 gene helps make a protein that holds skin cells tightly together. This supports the outer skin barrier and helps skin resist friction, water loss, and everyday irritation.
Risk
What if the gene does not work
Changes in the DSG1 gene can weaken the skin’s outer barrier. Milder variants are linked to thickened skin on the palms and soles, while more severe variants can cause severe dermatitis with allergies and poor growth.
Treatment
What does that mean for your treatment
A pathogenic or loss-of-function variant in the DSG1 gene does not currently have an established DSG1-specific treatment or drug-choice guideline. Care is based on the person’s symptoms, while the DSG1 gene is being studied as a skin-barrier target and disease marker rather than a guide to approved therapy.
Conditions associated with DSG1
Gene function
What if the gene works
Your skin needs strong links between neighboring cells so its surface stays intact during daily life. The DSG1 gene helps the outer layer of skin hold together and form a strong skin barrier. It also supports the normal step by step maturation of skin cells as they move toward the surface.
The DSG1 gene helps nearby skin cells attach to each other through desmosomes (tiny fastening points between cells). This gives the skin surface strength during everyday rubbing, washing, and movement.
In the upper skin layers, the DSG1 gene supports the organized packing of cells into a protective surface. That structure helps reduce water loss and supports the skin barrier against outside irritants.
As skin cells move upward, the DSG1 gene helps them change shape and take on their normal outer layer role. This steady maturation helps create a firm, well ordered skin surface.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply reflect natural genetic variation. In some situations, however, 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 DSG1 gene can change the desmoglein 1 protein so it is made in low amounts, folded poorly, or does not reach the cell surface correctly. DSG1 gene variants that affect skin cell adhesion may also weaken the protein’s binding to neighboring cells, making cell-to-cell links less stable. Milder variants can leave some protein activity, while more severe variants may greatly reduce or eliminate it, often leading to earlier or more extensive skin findings.
How variants are linked to conditions
Pathogenic variants in the DSG1 gene are best known for causing striate palmoplantar keratoderma, a condition with thickened skin on the palms and soles. More disruptive variants affecting both copies of the DSG1 gene can cause SAM syndrome, which includes severe skin inflammation, allergies, and poor growth. In discussions of conditions linked to DSG1 gene variants, these are the main well-established diagnoses.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely found in the general population. Most do not have a direct effect on health and simply 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 multiple genes and environmental factors also play a role. In some situations, 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 isn't yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the DSG1 gene itself. Risk is mainly linked to whether a disease-causing DSG1 change is present and, in inherited conditions, whether it runs in the family.
Inheritance of DSG1 variants
Inheritance of DSG1-related conditions can differ depending on the specific condition and the type of variant. Some DSG1 gene variants are inherited in an autosomal dominant pattern, which means a child can inherit the condition if one parent carries the variant. Other DSG1 gene variants are inherited in an autosomal recessive pattern, which means a child usually needs to inherit one altered copy from each parent. In practical terms, how DSG1 gene variants are inherited depends on whether the change is linked to a dominant skin condition or a recessive condition that appears only when both gene copies are affected.
What does my DSG1 result mean for my family?
DSG1 results can mean different things for relatives, because this gene is linked to more than one inherited condition. In some families, a changed DSG1 copy can run from parent to child, so close relatives may also carry it and may have skin findings such as thickened skin on the palms or soles. In other families, a condition related to DSG1 appears only when a child inherits a changed copy from both parents, which means parents and siblings could be carriers.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the DSG1 gene, a lab usually tests a blood sample, saliva, or a cheek swab. DSG1 genetic testing reads the DNA code and checks for variants, sometimes as part of a larger skin condition panel or whole exome test. Results can confirm a disease causing variant, find no relevant change, or show a variant of uncertain significance.
When should I consider getting a genetic test?
Consider genetic testing for the DSG1 gene if you or your child has inherited thick, painful skin on the palms and soles, or severe early skin barrier problems with frequent allergies and skin infections, especially if others in the family are affected. Testing can help confirm whether DSG1 is the cause.
A genetic result is only one part of your health story
A genetic result can be helpful, but what it can tell you varies based on the condition and the type of variant involved. The way the body works over time is shaped by many influences, including lifestyle, environment, age, and medical history. For some conditions, especially those linked to many genes, genetic information provides context rather than certainty and is best considered alongside 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 breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same treatment may work well for one person, have less effect in another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines the way genetic differences affect a person’s response to medicines. It studies links between genes and medications to help explain why the same treatment can work differently in different people. With many drugs, genes influence either how powerfully the medicine works or how the body handles it. This information can support more informed, individualized treatment choices. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the DSG1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are used, so questions about medications, side effects, or changes in your health are best discussed with your doctor or pharmacist.
History
DSG1 entered medical research through studies of the skin conditions pemphigus foliaceus and pemphigus vulgaris, when scientists were trying to identify the targets of harmful antibodies. In the 1980s and 1990s, advances in genetics gradually revealed how this gene works. Researchers then recognized the DSG1 gene as one of the key genes encoding desmogleins, a family of proteins central to desmosome research. Its importance grew further when inherited skin conditions were linked to variants in the DSG1 gene, including forms of thickened skin on the palms and soles and later a rare syndrome affecting skin and allergies. Over time, descriptions became more precise. These findings helped connect autoimmune skin disease and inherited skin conditions through one shared genetic pathway.