The ST14 gene helps skin and hair-forming cells mature and build a strong outer barrier. If it does not work properly, the skin may lose moisture more easily and become dry, thick, or scaly, and hair may be sparse, brittle, or slow to grow. Pathogenic variants in the ST14 gene are linked to rare inherited conditions that mainly affect the skin, scalp, and sometimes the eyes.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or guide processes in the body. Some genes hold the directions for making proteins, the parts of cells that do much of the work. Other genes are mainly involved in controlling when certain processes happen, where they take place, and how strongly they occur. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. If you want to look into this topic more closely, you can read more in the LearnHub.
Overview
ST14Gene function
What if the gene works
The ST14 gene gives cells instructions for a protein that supports normal skin and hair development. It helps outer skin cells mature and maintain the skin barrier, which helps protect the body and hold in moisture.
Risk
What if the gene does not work
Variants in both copies of the ST14 gene can cause dry, scaly skin from birth and sparse hair. Milder to more severe variants may affect how early signs appear and how much the skin and hair are involved.
Treatment
What does that mean for your treatment
For pathogenic variants in the ST14 gene, no ST14-specific treatment or management approach is currently established. Care is symptom based, such as skin moisturizers and other supportive measures, and the ST14 gene is also being studied as a cancer biomarker and possible drug target.
Conditions associated with ST14
Gene function
What if the gene works
Your body needs the ST14 gene to keep the skin and other body linings strong, organized, and able to renew themselves. It provides instructions for a surface enzyme that switches selected proteins on at the right place. This helps explain how the ST14 gene supports the skin barrier and healthy epithelial tissue.
The ST14 gene makes an enzyme on the cell surface that cuts specific proteins into their active form. This controlled protein switching helps nearby cells carry out routine jobs in the right place.
In skin and other body linings, the ST14 gene helps cells mature from deeper layers into working surface cells. This steady maturation supports normal tissue structure and everyday resilience.
This gene supports the building of the outer skin barrier, which helps hold in moisture and block outside irritants. It also helps surface cells form the specialized layers that make that barrier work.
The ST14 gene helps epithelial cells, which line the skin and many internal surfaces, stay well organized. It supports contact between neighboring cells so tissue surfaces remain orderly and protective.
What is a variant?
A genetic variant is a slight 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 cause 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
ST14 gene variants that affect protein function can reduce how much matriptase is made, alter its shape, or stop it from reaching the cell surface and switching on properly. Some changes leave partial activity, while more severe variants, including stop and certain splice variants, may leave little or no working protein. This loss of function can disrupt skin cell maturation and barrier building, and stronger effects often go with earlier or more marked ichthyosis and hair changes.
How variants are linked to conditions
Pathogenic variants in the ST14 gene cause ichthyosis with hypotrichosis, a rare inherited condition with dry, scaly skin and sparse hair. In many families, an ST14 gene variant linked to ichthyosis with hypotrichosis helps confirm the diagnosis. Some people also have reduced sweating and small pits or rough changes around hair follicles. This condition usually appears when both copies of the gene carry a pathogenic variant.
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 directly affect health and instead represent normal human diversity. For many genes, carrying a variant associated with a condition indicates a possible association rather than a confirmed diagnosis, especially when several genes and environmental factors 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?
For ST14, risk is mainly shaped by genetics rather than lifestyle. A child is more likely to be affected when both parents carry a changed ST14 gene, and the chance can be higher in families with a shared ancestry or blood relatives having children together. Once the gene change is present in both copies, day-to-day habits do not meaningfully change whether the condition develops.
Inheritance of ST14 variants
How ST14 gene variants are inherited depends on the condition linked to the change, and the well-established ST14-related condition follows an autosomal recessive pattern. This means a child usually needs to inherit one ST14 variant from each parent to be affected. When both parents carry one variant, each pregnancy has a 25% chance of an affected child, a 50% chance of a child who is a carrier, and a 25% chance of a child with no familial variant. Because the ST14 gene is on a non-sex chromosome, this inheritance pattern is the same for sons and daughters.
What does my ST14 result mean for my family?
For ST14, family impact is usually discussed in a recessive pattern. Parents of someone with a disease-causing ST14 result are often healthy carriers, and brothers or sisters may also be carriers or, less often, may have the same condition. Other relatives on both sides of the family may carry the same gene change too.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the ST14 gene, a lab can analyze a blood or saliva sample using DNA sequencing. This is how ST14 genetic testing works: the lab reads the gene’s code and checks for variants linked to inherited conditions. Results may show a pathogenic variant, a benign variant, or an unclear finding.
When should I consider getting a genetic test?
Consider testing for changes in the ST14 gene when there is a personal or family history of a rare inherited condition that causes dry, scaly skin and sparse hair from birth. It can also help clarify the cause when a baby or child has these features and doctors suspect a genetic skin condition.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it explains varies by the condition and the type of variant involved. Lifestyle, environment, age, and medical history are among the many factors that shape how the body functions over time. For some conditions, especially those influenced by 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 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 genes can change how the body breaks down a drug, moves it through the body, or responds at its target, so the same treatment may work better for one person than for another. This is common and can influence how much benefit someone gets from a medication or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect the way people respond to medications. It looks at gene and drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This information can support treatment decisions that are more informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the ST14 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or which side effects are more likely. If you have concerns about a medicine, new symptoms after starting treatment, or questions about your health, talk with your doctor or pharmacist.