The KLK5 gene makes an enzyme that helps the outer layer of skin shed in a controlled way and supports the skin barrier. This gene plays an important role in keeping skin renewal and irritation signals balanced. If the gene is too active or not working as it should, the skin surface can become unstable, which may contribute to dryness, redness, scaling, or inflammation. The KLK5 gene is also being studied in conditions affecting the skin and some other tissues.
What is a gene?
Genes are sections of DNA that provide instructions cells can use to make molecules or regulate activities in the body. Some genes hold the information needed to produce proteins, the parts of cells that do much of the work. Other genes mainly guide when certain processes take place, where they occur, and how strongly they operate. As a group, genes affect how the body develops and works, and they can also influence how you respond to food, stress, and medications. To explore this subject in more detail, you can learn more in the LearnHub.
Overview
KLK5Gene function
What if the gene works
The KLK5 gene helps make an enzyme active mainly in the outer skin. It supports normal shedding of dead skin cells and helps maintain the skin barrier.
Risk
What if the gene does not work
Milder to more severe variants in the KLK5 gene can partly reduce or nearly abolish its protein's activity. This can disrupt the controlled breakdown of links between skin cells and alter signaling at the skin surface.
Treatment
What does that mean for your treatment
No KLK5-specific treatment or drug-selection approach is currently established for people with a pathogenic or loss-of-function variant in the KLK5 gene. The KLK5 gene is being studied as a possible drug target and biomarker, especially in skin inflammation and some cancers, but this has not yet led to guideline-based treatment choices.
Gene function
What if the gene works
Your outer skin is constantly renewing itself. The KLK5 gene helps manage this steady turnover by making an enzyme that works near the skin surface. It is especially important where older skin cells need to loosen and lift away in a controlled way. Many people come across the KLK5 gene when learning how normal skin shedding supports a healthy skin barrier.
KLK5 helps your outer skin release old cells in a steady, controlled way. Its enzyme trims the links between surface cells so they can lift away as new cells arrive.
This ongoing turnover helps keep skin texture even and supports the normal cycle of skin barrier renewal. It is part of how the body replaces worn surface layers after daily washing, rubbing, and sun exposure.
KLK5 also switches on other skin enzymes at the surface. This creates a coordinated chain of activity so skin cell shedding happens in the right place and at the right pace.
By guiding turnover in the outermost layer, KLK5 helps maintain a flexible protective covering. Many people read about the KLK5 gene in connection with skin barrier function because this surface layer helps hold in moisture and block irritants.
What is a variant?
A genetic variant is a minor difference in the DNA sequence of 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 have any noticeable effect and simply represent 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
How KLK5 gene variants affect protein activity depends on where the DNA change sits. Some variants slightly reduce how well the kallikrein 5 protein folds, is secreted, or cuts its targets, while more severe loss-of-function variants can sharply lower enzyme activity or stop the protein from being made at all. This functional range can influence how strongly cell surface protein processing is disrupted.
How variants are linked to conditions
Current research on how KLK5 gene variants are linked to conditions is still developing, and this gene does not yet have a broadly confirmed link to a specific health condition. If you carry a confirmed variant in the KLK5 gene, your doctor or genetic counselor can explain what it may mean in the context of your personal and family history.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and occur commonly across the general population. Most do not directly affect health and simply reflect normal human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences also play a role. In some situations, though, one well described 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 KLK5 gene itself. If a KLK5 result is part of your medical care, a doctor or genetic counselor can help put it in the context of your personal and family history.
Inheritance of KLK5 variants
Information on how KLK5 gene variants are inherited is still evolving, and there is not yet a broadly confirmed disease specific inheritance pattern for the KLK5 gene. This means a single label such as autosomal dominant or autosomal recessive is not firmly established for KLK5 in routine clinical genetics. The KLK5 gene is located on chromosome 19, which is an autosome, so each person inherits one copy from each parent.
What does my KLK5 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for the KLK5 gene in the way there is for some well-known inherited conditions. If you have a specific KLK5 result and questions about what it could mean for your family, a doctor or genetic counselor can explain it in the context of your own health and family history.
Genetic information
Genetic testing
How you find out about variants
Genetic testing is how you find out about variants in the KLK5 gene. A lab studies DNA from blood, saliva, or a cheek swab, usually by reading the gene's code to look for changes and reporting whether a variant was found and how well it is understood.
When should I consider getting a genetic test?
There is not yet a broadly established reason for most people to have genetic testing focused specifically on the KLK5 gene. Testing choices are usually based on your symptoms, family history, and whether a doctor or genetic counselor thinks a broader genetics work-up could be helpful.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and the type of variant involved. Over time, many factors, including age, lifestyle, environment, and medical history, influence how the body works. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is best understood as one part of overall care. In other situations, a genetic result may give a clear answer. In areas such as 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 absorbs, breaks down, transports, or responds to a treatment. This helps explain why the same medication may work well for one person, have less effect in another, or cause more side effects in someone else. These differences are common and are one part of the bigger picture, along with age, other health conditions, and other medicines.
What is Pharmacogenetics?
Genetic differences can affect how people respond to medicines, and pharmacogenetics is the field that examines this. It studies relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. With many medications, genes influence both how strongly a drug works and how the body handles it. This information can support treatment choices that are more informed and more tailored to the individual. More detail on this topic is available in the LearnHub.
Drugs influenced by the KLK5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so questions about medications, side effects, or your overall health are best discussed with your doctor.
History
The KLK5 gene entered genetics through work on a larger family of related genes called kallikreins, which drew growing attention in the late 20th century. In the 1990s, researchers studying proteins on the skin surface identified KLK5 under the name stratum corneum tryptic enzyme, or SCCE. Building on this early work, scientists later placed it within the kallikrein gene cluster on chromosome 19, helping connect earlier skin findings with a broader gene family. As gene mapping and sequencing improved, KLK5 became part of a clearer picture of how skin biology could be studied at the genetic level. Over time, its naming and classification were aligned with the modern kallikrein system, giving it the now standard name KLK5.