The QPRT gene helps make NAD, a molecule your cells need for energy, by clearing quinolinic acid, a natural breakdown product. This gene helps your body keep quinolinic acid from building up to levels that may irritate or harm brain cells. If the gene does not work properly, NAD production can fall and quinolinic acid can rise, which may contribute to rare neurologic problems such as developmental delay or seizures.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or regulating activities in the body. Some genes carry the code for proteins, which do much of the cell’s work. Others mainly direct when certain processes take place, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can also influence how you respond to food, stress, or medications. For a deeper look at this topic, more information is available in the LearnHub.
Overview
QPRTGene function
What if the gene works
The QPRT gene helps your cells make NAD, a helper molecule needed for energy and repair. It also breaks down quinolinic acid, a natural chemical that can build up, especially in the brain.
Risk
What if the gene does not work
Milder to more severe variants in the QPRT gene can reduce or disrupt an enzyme that helps clear a natural body chemical called quinolinic acid while making NAD, a molecule cells use for energy. This can alter cell metabolism.
Treatment
What does that mean for your treatment
A pathogenic loss-of-function variant in the QPRT gene does not currently have an established QPRT-specific treatment or drug choice approach in clinical guidelines. The QPRT gene is being studied as a biomarker and possible drug target in some cancers and neurologic research, but this has not yet changed routine care.
Gene function
What if the gene works
The QPRT gene helps your cells turn quinolinic acid, a natural product made while processing tryptophan, into a building block for NAD. NAD is a helper molecule your body uses to release energy from food and support many routine cell jobs. This is part of how the QPRT gene helps make NAD from tryptophan.
One of the main jobs of the QPRT gene is to help make nicotinic acid mononucleotide, an early building block for NAD. This supports basic cell activities such as energy use and routine cell maintenance.
The QPRT gene also converts quinolinic acid into a useful next-step molecule. This helps your body process tryptophan in a controlled, efficient way.
Inside a normal cell pathway, the QPRT gene connects tryptophan breakdown with NAD production. That link helps turn a natural intermediate into something cells can use for everyday work.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and help make up normal human diversity, including differences in appearance, metabolism, and 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 significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the QPRT gene can make the protein less stable, less active, or unable to fold into its usual shape. How QPRT gene variants affect protein function depends on the change: milder variants may leave some activity, while more severe variants can sharply reduce or stop it. This may cause buildup of quinolinate, a natural cell chemical, and lower production of NAD, a molecule cells use in energy processes.
How variants are linked to conditions
The QPRT gene does not yet have a broadly confirmed link to a specific health condition, though research on health conditions linked to variants in the QPRT gene is still developing. Anyone with a confirmed diagnosis involving the QPRT gene should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology and are widespread in the general population. Most do not directly affect health and instead reflect the natural variation seen among people. With many genes, a variant connected to a condition suggests a possible association, not a definite diagnosis, particularly when more than one gene and environmental factors are involved. In some instances, though, one well-characterized variant in a particular 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 QPRT gene. If a change in QPRT has been found in you or your family, a doctor or genetic counselor can help explain what it may mean for your personal risk.
Inheritance of QPRT variants
There is not yet a broadly confirmed inheritance pattern tied to a specific human condition for the QPRT gene, so a single answer to how QPRT gene variants are inherited is not currently established. QPRT is located on chromosome 16, which is an autosome. That means you inherit one copy of the QPRT gene from each parent. As research develops, the way certain QPRT gene variants are inherited and whether they consistently relate to a defined condition may become clearer.
What does my QPRT result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific well-established condition for QPRT, though this understanding can change as research develops. If you have a specific QPRT result and questions about what it could mean for your family, a doctor or genetic counselor can help explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
Variants in the QPRT gene are found with genetic testing, usually from a blood sample, saliva, or a cheek swab. To understand how QPRT genetic testing works, a lab reads the gene’s DNA code and checks for changes. Results may show a benign variant, a disease linked variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
There isn't yet a broadly established QPRT-specific reason for routine genetic testing. Decisions about testing are usually made with a doctor or genetic counselor based on your symptoms and family history.
A genetic result is only one part of your health story
A genetic result may offer valuable insight, but how much it reveals depends on the condition and the type of variant involved. Lifestyle, environment, age, and medical history, along with other factors, 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 interpreted alongside other parts of 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 genes can change how the body breaks down a drug, moves it through the bloodstream, or responds to it at its target. This helps explain why the same medication may work well for one person, seem less effective for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. It studies links between genes and drugs to help explain why the same treatment may work differently from one person to another. With many medicines, genes influence how strongly a drug works or how the body handles it. This information can support more informed, more individualized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the QPRT gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choices, so questions about side effects, new symptoms, or how a treatment is working are best discussed with your doctor.