The HPN gene gives instructions for hepsin, a protein on the cell surface that helps activate other proteins and supports normal tissue structure. This gene plays an important role in the inner ear, where its activity helps hearing work normally. Rare inherited variants that greatly reduce activity of the HPN gene can cause hearing loss, often without other major health features.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or manage processes in the body. Some genes provide the information needed to make proteins, the parts of cells that do the work. Other genes mainly help regulate when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more in depth look at this topic, you can learn more in the LearnHub.
Overview
HPNGene function
What if the gene works
The HPN gene makes hepsin, a cell surface enzyme that cuts proteins. It helps cells interact with their surroundings and supports normal tissue organization, especially in the liver and prostate.
Risk
What if the gene does not work
If the HPN gene works less well, its cell surface protein may process fewer nearby proteins, which can change local cell signaling and tissue interactions. Milder variants may partly lower activity, while more severe variants can reduce it further.
Treatment
What does that mean for your treatment
No HPN-specific treatment or management approach is currently established in clinical guidelines. In research, the HPN gene is being studied mainly as a cancer biomarker and possible drug target, especially in prostate cancer.
Gene function
What if the gene works
The HPN gene helps cells manage proteins at their outer surface. It makes an enzyme called hepsin, which cuts certain proteins in a controlled way so they can be used at the right place and time. Knowing what the HPN gene does in the body helps explain how cells interact with nearby tissue and keep local signals organized.
The HPN gene makes a protease (an enzyme that cuts proteins) at the cell surface. This careful trimming can activate proteins or change how they work near the cell membrane.
Some proteins are released in an inactive form and need a precise cut before they can send a signal. Hepsin helps with this local activation, which supports orderly communication between cells and nearby tissue.
By working where cells meet their surroundings, this gene helps manage the protein environment outside the cell. That supports normal tissue structure and steady contact between cells and the material around them.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and the way the body reacts to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene works more significantly and may contribute to, or cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the HPN gene can change the hepsin protein's shape, stability, or placement on the cell surface, which may alter its protein-cutting activity or how it interacts with nearby molecules. In terms of how HPN gene variants affect protein function, milder single-letter changes may leave some activity intact, while more disruptive variants that shorten the protein or disturb RNA splicing (how the cell edits the gene message) can markedly lower protein levels or make the protein unstable.
How variants are linked to conditions
Right now, the HPN gene does not yet have a broadly confirmed link to a specific health condition, so information about HPN gene variants linked to conditions is still evolving. If you have a confirmed variant in the HPN gene, your doctor or genetic counselor can explain what it may mean in the context of your own health and family history.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and simply reflect natural differences between people. For many genes, having a variant connected with a condition points to a possible association rather than a certain diagnosis, particularly when several genes and environmental influences play a role. Still, in some situations, one well-characterized variant in a particular 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 HPN gene. Anyone with concerns about their personal or family risk can speak with a doctor or genetic counselor.
Inheritance of HPN variants
There is not yet a broadly confirmed, disease-specific Mendelian pattern for how HPN gene variants are inherited, so the answer to how HPN gene variants are inherited is still developing as research grows. The HPN gene is located on chromosome 19, which is an autosome. That means each person inherits one copy of the HPN gene from their mother and one copy from their father.
What does my HPN result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific health condition for the HPN gene, and this understanding may change as research grows. If you have a specific HPN result and want to know what it could mean for close relatives, a doctor or genetic counselor can help explain it in the context of your family history and the exact result.
Genetic information
Genetic testing
How you find out about variants
To find variants in the HPN gene, doctors use genetic testing on a blood sample, saliva sample, or cheek swab. HPN genetic testing reads the DNA code in this gene to look for changes. Results may show a benign variant, a variant linked to health effects, or a variant of uncertain significance.
When should I consider getting a genetic test?
There is not yet a broadly established, HPN-specific reason for genetic testing in routine care. Decisions about testing are best made with a doctor or genetic counselor based on your personal and family history.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, though what it reveals depends on the condition and the specific type of variant. Over time, the way the body functions is shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is most useful when viewed together with other parts of care. In other situations, a genetic result may give 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 your body responds to medicines. Some people break down a drug faster or slower than expected, so the same treatment may work differently from one person to another. These differences are common and can influence how much benefit a medicine gives or how sensitive someone is to side effects. Medication response also depends on other factors, including age, liver and kidney function, and other medicines being taken.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way medications work. It studies gene-drug patterns to help explain why the same treatment may not have the same effect in everyone. With many medicines, genes can influence both how strong a drug’s effect is 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 HPN 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 side effects, new symptoms, or medication changes are best discussed with your doctor.
History
The HPN gene came into medical research through studies of proteases, a group of enzymes that cut proteins at the cell surface. In the 1990s, researchers identified hepsin, the protein made from the HPN gene, and mapped the gene as part of broader work on how cells grow and interact with their surroundings. From these first observations, research expanded steadily. Interest later increased when studies found high HPN activity in prostate tissue and in some prostate cancers, which made the gene relevant to cancer biology research. Over time, scientists refined where HPN is active in the body and how it may take part in normal tissue function as well as disease. Unlike some genes that became widely known through public figures, HPN’s history has stayed mostly within laboratory and clinical research.