The PENK gene provides instructions for making proenkephalin, which is processed into enkephalins, natural chemical messengers that help control pain, stress responses, mood, and gut activity. This gene helps your body fine tune how nerve cells communicate. If the PENK gene does not work as expected, these signals may be altered, which can affect how pain and other nerve functions are processed. Many variants in this gene are harmless, while a few may change how the gene works.
What is a gene?
Genes are sections of DNA that give your cells instructions for making molecules or directing activities in the body. Some genes carry the code for proteins, which do the day to day work inside cells. Others mainly 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
PENKGene function
What if the gene works
The PENK gene helps make enkephalins, small natural signaling proteins. These proteins support pain control and help shape stress, mood, and nerve signaling.
Risk
What if the gene does not work
Milder to more severe variants in the PENK gene can lower or alter production of enkephalin peptides, which help nerve cells communicate. This may weaken opioid signaling and change how brain and other tissues respond to stress and pain signals.
Treatment
What does that mean for your treatment
No PENK-specific treatment or drug-choice guidance is currently established in clinical practice, so a pathogenic or loss-of-function variant in the PENK gene does not currently change standard management. The PENK gene is being studied mainly as a biomarker through proenkephalin blood levels in kidney and heart disease, but this has not led to gene-directed treatment decisions.
Gene function
What if the gene works
Your body uses the PENK gene to make natural signaling peptides that help tune nerve activity. These signals are especially important in areas that process pain, stress, and emotion. Understanding the PENK gene's function helps explain how the body makes some of its own pain calming messages.
The PENK gene gives cells instructions to make a larger protein that is later cut into enkephalins, which are small messenger peptides. These are natural pain calming signals used by nerve cells.
Enkephalins from the PENK gene help adjust how pain messages travel through the brain and spinal cord. This supports the body’s own system for keeping pain signals in balance.
These same signals also help shape brain activity linked to stress, emotion, and reward. This supports steadier responses to everyday challenges.
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, and how the body responds 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 substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Changes in the PENK gene can lower how much proenkephalin a cell makes, alter the protein’s stability, or disrupt the sites where it is cut into shorter signaling peptides. How variants influence the PENK gene's function often depends on where the DNA change sits. Some variants may cause only a mild shift in peptide processing or levels, while more disruptive variants can greatly reduce or completely stop production of the usual peptides.
How variants are linked to conditions
Right now, the PENK gene does not yet have a broadly confirmed link to a specific health condition, although research on how variants in the PENK gene are linked to conditions is still developing. If you have a confirmed PENK-related diagnosis or a reported variant in the PENK gene, your doctor or genetic counselor can explain what that result means for you.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely seen in the general population. Most do not have a direct impact on health and simply represent natural human variation. For many genes, having a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors also contribute. 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the PENK gene. If you have a PENK result and want to understand what it may mean for you or your family, a doctor or genetic counselor can help put it in context.
Inheritance of PENK variants
There is not yet a broadly confirmed Mendelian pattern for how PENK gene variants inherited in relation to a specific PENK related condition, and this picture may become clearer as research develops. The PENK gene is located on chromosome 8, which is an autosome, so you inherit one copy from each parent. In general, that means a change in either copy can be passed from a mother or a father to a child.
What does my PENK result mean for my family?
There is not yet a broadly confirmed, condition-specific inheritance pattern for the PENK gene that clearly tells families who else may be affected or carry the same result. If you have a specific PENK finding and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your family history and health.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the PENK gene, a lab can analyze DNA from a blood sample, saliva, or a cheek swab. PENK gene genetic testing reads the gene’s code and compares it with the usual sequence to identify changes a clinician can interpret in the context of your symptoms or family history.
When should I consider getting a genetic test?
There is not yet a widely established reason to order genetic testing just for the PENK gene. Decisions about testing are best made with a doctor or genetic counselor who can look at symptoms, family history, and whether a broader test would be more useful.
A genetic result is only one part of your health story
A genetic result can provide meaningful insight, but how much it explains depends on the condition and the type of variant. Factors such as lifestyle, environment, age, and medical history also influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can help place a person’s 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 absorbs, breaks down, or responds to a drug, so the same treatment may work better for one person than for another. This is a common reason why some people get good symptom relief, while others notice less benefit or are more sensitive to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect a person’s response to medications. By studying the relationship between genes and drugs, it helps 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. You can learn more about this topic in the LearnHub.
Drugs influenced by the PENK gene
When should I seek medical advice?
There is not yet a broadly confirmed link between this gene and how medicines should be chosen or adjusted, so concerns about side effects, treatment response, or your overall health are best discussed with your doctor.
History
Interest in the PENK gene grew out of a major shift in pain research during the 1970s, when scientists discovered enkephalins, the body’s own opioid-like signaling molecules. Researchers then showed that these small peptides are made from a larger precursor, which led to identification of the PENK gene in the early 1980s. Initially understood only through visible traits, later recognized as tied to a specific gene, this work helped connect brain chemistry with genetics in a new way. From these first observations, research expanded steadily into pain signaling, stress responses, and brain function. The way this gene was viewed has shifted over time. What began as basic discovery science became an important part of modern neurobiology and opioid research.