The HPR gene helps make a blood protein that travels with HDL particles and supports the body’s natural defense against certain parasites, especially the ones linked to African sleeping sickness. If it does not work as expected, this parasite defense may be less effective, although many variants in this gene have little effect on day to day health. The HPR gene is mainly known in infection research rather than through celebrity or media attention.
What is a gene?
Genes are sections of DNA that hold instructions your cells use to make molecules or to regulate processes in the body. Some genes provide the directions for producing proteins, which are the functional parts of cells. Other genes mostly help manage when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, and medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
HPRGene function
What if the gene works
The HPR gene helps make a blood protein related to haptoglobin. This protein helps handle free hemoglobin and supports the body’s natural defense against certain parasites.
Risk
What if the gene does not work
Variants can lower HPR protein levels or change how it joins a blood particle called trypanosome lytic factor. Milder variants may partly reduce this parasite targeting activity, while more severe variants can disrupt it more strongly.
Treatment
What does that mean for your treatment
No treatment or management approach specifically tied to pathogenic variants in the HPR gene is currently established. The HPR gene is mainly being studied as a host defense and biomarker gene, including research on trypanosome infection and inflammation, rather than as a guide for drug choice.
Gene function
What if the gene works
The HPR gene helps your body make a blood protein that travels in HDL particles, a type of cholesterol carrying particle. In the bloodstream, this protein supports part of the body’s early defense against certain parasites. Understanding how the HPR gene works shows how blood proteins can team up to patrol the circulation.
The HPR gene helps make a protein that is released into the bloodstream. This allows it to circulate where it can support normal immune defense.
Its protein joins special HDL particles, a type of cholesterol carrying particle in blood. These particles are part of your body’s built in defense against certain blood parasites.
HPR protein can attach to hemoglobin, the oxygen carrying protein in red blood cells. This pairing helps protective blood particles interact with specific parasites during normal immune surveillance.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, such as variations 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 cases, 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 HPR gene can change the shape, stability, or amount of HPR protein made by the body. In answer to how HPR gene variants affect protein function, some changes are mild and only slightly reduce how well the protein folds, is released into the blood, or binds its partners, while more severe variants can greatly reduce or stop protein production. These stronger changes may leave little or no working HPR protein available in blood particles.
How variants are linked to conditions
At this point, the HPR gene does not yet have a broadly confirmed link to a specific health condition, although research on possible HPR gene variants and health conditions is still developing. If you have a confirmed change in the HPR gene on testing, your doctor or genetic counselor can explain what that result means in the context of your personal 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 variation among people. For many genes, carrying a variant associated with a condition points to a possible link rather than a confirmed diagnosis, particularly when more than one gene and environmental influences play a role. In some situations, though, a single well-characterized variant in a particular gene is enough to establish 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 HPR gene. Anyone with concerns about personal or family risk can speak with a doctor or genetic counselor.
Inheritance of HPR variants
There is not yet a broadly confirmed Mendelian inheritance pattern for health conditions tied specifically to variants of the HPR gene. As a result, HPR gene inheritance is not described in the same clear way as genes linked to well-established dominant, recessive, or X-linked conditions. The HPR gene is located on chromosome 16, which is an autosome, so you inherit one copy from each parent. That means any HPR gene variant can be passed down through either side of the family.
What does my HPR result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific recognized condition for the HPR gene, and research is still evolving. If you have a specific HPR result and want to understand what it could mean for close relatives, a doctor or genetic counselor can help 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 HPR gene, a lab can do genetic testing for HPR variants using a blood sample or saliva sample. The test reads the DNA sequence in the HPR gene and compares it with the usual sequence, then reports any variants and whether they are known to affect health.
When should I consider getting a genetic test?
There is not yet a widely used, HPR-specific reason to get genetic testing in everyday medical care. Decisions about testing are usually based on your personal health, family history, and whether a doctor or genetic counselor thinks a broader test 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 varies by the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, affect how the body functions. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most helpful when viewed alongside 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. This helps explain why the same treatment works well for one person, feels too strong for another, or does not help as much as expected in someone else. Differences in how the body absorbs, breaks down, or uses a drug are common, and they can influence both benefit and side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic variation can shape a person’s response to medications. It studies links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can affect both how strongly a drug works and how the body processes 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 HPR gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so general questions about side effects, treatment changes, or other health concerns are best discussed with your doctor.
History
The HPR gene came into view as scientists worked to understand why normal human blood can kill some African trypanosomes, the parasites that cause sleeping sickness. In recent decades, awareness of this gene’s role has grown as researchers linked HPR to a special blood particle involved in this natural defense. Building on this early work, scientists uncovered more about the HPR gene while studying apolipoprotein L1 and other parts of the same parasite killing system. Its history is closely tied to tropical medicine, human evolution, and efforts to explain why some trypanosome species infect people while others do not. These historical steps shaped today’s understanding of the HPR gene as part of a long scientific story about infection and inherited biology.