The DSP gene helps make desmoplakin, a protein that helps fasten neighboring cells together, especially in the heart, skin, and hair follicles. When this protein does not work well, tissues under repeated stress can become fragile, which may lead to heart rhythm problems, a weakened heart muscle, or changes in the skin and hair. Some people first learn about this gene when genetic testing looks for an inherited heart muscle condition in a family.
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 hold the directions for producing proteins, the functional parts of cells. Other genes mostly control when certain processes happen, where they take place, and how strongly they operate. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
DSPGene function
What if the gene works
The DSP gene helps make desmoplakin, a protein that anchors cells together in tissues under stress, especially the heart and skin. This supports tissue strength and steady electrical signaling in the heart.
Risk
What if the gene does not work
Variants in the DSP gene can affect the heart muscle, raising the chance of arrhythmogenic or dilated cardiomyopathy, and some affect skin and hair. Milder to more severe variants may influence when features appear and how they affect someone.
Treatment
What does that mean for your treatment
No DSP-specific treatment or drug choice is currently established. In practice, care is guided by a person's heart or skin findings, and pathogenic variants in the DSP gene are being studied as markers of abnormal heart rhythm risk.
Conditions associated with DSP
Gene function
What if the gene works
Your heart and skin go through constant stretching, rubbing, and movement. In these tissues, the DSP gene helps neighboring cells stay firmly connected. This is a key part of what the DSP gene does in the skin and heart during everyday life.
The DSP gene helps build strong contact points that hold neighboring cells together. These links are especially important in the heart and outer layers of the skin, where cells face repeated pulling and friction.
Inside each cell, DSP connects those outer contact points to the cell’s support fibers, which act like internal cables. This lets force spread through the tissue instead of straining one small spot.
When cells move, stretch, and contract, DSP helps tissues stay organized and stable. In daily cell function, this gene works to support the heart muscle’s pumping action and the skin’s barrier surface.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help account for normal differences among people, including appearance, metabolism, and how the body responds to environmental influences. Many variants do not produce any noticeable effect and are simply part of natural genetic variation. In some situations, 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 DSP gene can weaken or shorten desmoplakin, so it binds less well at the cell junctions that hold neighboring cells together. DSP gene variant effects range from milder missense changes that partly reduce protein stability or binding to more severe truncating or splice variants that markedly lower functional protein. This can leave cell-to-cell attachment less stable, and more disruptive variants are often linked to earlier or stronger DSP-related disease features.
How variants are linked to conditions
Pathogenic variants in the DSP gene are a well-established cause of arrhythmogenic cardiomyopathy, a heart muscle condition that can affect rhythm and pumping. Some variants in the DSP gene also cause dilated cardiomyopathy or skin and hair conditions such as striate palmoplantar keratoderma and Carvajal syndrome. In practice, the main DSP gene variants linked to conditions involve the heart, though the exact features can vary from person to person.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology, and they are common in the general population. Most do not have a direct effect on health and instead reflect normal human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definitive diagnosis, especially when several genes and environmental factors also play a role. 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?
For people with a harmful DSP variant, risk is driven mainly by the variant itself. Strenuous endurance exercise can raise the chance of heart rhythm problems and may speed heart muscle disease in some people living with DSP changes. Close follow-up can help catch problems early.
Inheritance of DSP variants
How DSP gene variants are inherited depends on the specific DSP related condition. In many families, heart conditions linked to the DSP gene follow an autosomal dominant pattern, which means a parent carrying the variant can pass it to a child with a 50% chance in each pregnancy. Some rarer DSP related conditions follow an autosomal recessive pattern, meaning a child inherits one variant from each parent. Because of that, inheritance in the DSP gene is not described by one single pattern for every condition.
What does my DSP result mean for my family?
For many DSP results, close relatives such as parents, brothers, sisters, and children may also carry the same gene change, so the result can matter beyond one person. DSP is linked to more than one inherited condition, and the family impact depends on which DSP-related condition or result is present: some run in families when just one changed copy is enough, while others affect relatives mainly as healthy carriers. In some families, a DSP change can also appear for the first time in one person rather than being passed down by a parent.
Genetic information
Genetic testing
How you find out about variants
Genetic testing of the DSP gene uses a blood or saliva sample to read the gene’s DNA code and look for variants. Results may show no variant, a variant linked to disease, or a variant of uncertain significance, which means its health effect is not yet clear.
When should I consider getting a genetic test?
Consider testing for changes in the DSP gene if you or close relatives have an inherited heart muscle condition, serious heart rhythm problems, or sudden unexplained death at a young age. It can also help when heart disease appears together with very curly hair or thick skin on the palms of the hands or soles of the feet.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but how much it explains depends on both the condition and the kind of variant involved. Over time, the way the body functions is shaped by many factors, including lifestyle, environment, age, and medical history. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and makes the most sense when considered with 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 personal experiences in 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 bloodstream, or responds to it at its target. This is common and can help explain why the same treatment works well for one person, works less well for another, or causes more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way a person responds to medications. It studies patterns between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body handles it. This information can support more informed, individualized treatment decisions. To look into this topic in more detail, you can learn more in the LearnHub.
Drugs influenced by the DSP 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 medicines, side effects, or your overall heart health are best discussed with your doctor.
History
DSP entered medical genetics through studies of desmoplakin, a protein identified in desmosomes during cell biology research in the late 20th century. Building on this early work, scientists uncovered more about the gene. By the 1990s and early 2000s, variants in the DSP gene were linked to inherited skin conditions and to heart muscle disease, especially forms of arrhythmogenic cardiomyopathy. Reports of families with both hair or skin changes and heart problems helped connect these findings into a clearer genetic picture. Over time, the DSP gene became recognized as an important part of the history of inherited cardiomyopathy research and cardiocutaneous conditions.