The GART gene helps cells make purines, the building blocks needed for DNA, RNA, and energy transfer. If the GART gene does not work properly, cells may struggle to grow and communicate normally, which can affect brain development and other body systems. This gene plays an important role in early growth, so rare harmful variants can lead to developmental delays and other brain and nerve symptoms. Extra GART activity is also studied in Down syndrome because this gene is located on chromosome 21.
What is a gene?
Genes are segments of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes contain the directions for producing proteins, the parts of cells that carry out much of their work. Other genes mainly help determine when certain processes happen, where they happen, and how active they are. As a group, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. If you want to look into this topic more closely, you can learn more in the LearnHub.
Overview
GARTGene function
What if the gene works
The GART gene helps cells make purines, which are building blocks for DNA and RNA and part of the molecules cells use for energy. This supports normal growth and cell division.
Risk
What if the gene does not work
Rare variants in the GART gene can disrupt purine production and cause a metabolic condition with developmental delay, low muscle tone, seizures, and poor growth. Milder or more severe variants may change when symptoms start and how pronounced they are.
Treatment
What does that mean for your treatment
No GART-specific treatment or drug choice approach is currently established for people with a pathogenic variant in the GART gene. In research, the GART gene is being studied as a possible drug target and biomarker in some cancers, but this has not led to routine care.
Gene function
What if the gene works
Your cells need a steady supply of purines, small building blocks used in DNA, RNA, and energy-carrying molecules. The GART gene helps make these building blocks from basic starting materials. Understanding GART gene function helps show how your body supports routine cell growth, repair, and daily activity.
The GART gene helps your cells build purines from simple raw materials. This is a central part of how the body makes fresh supplies instead of only recycling older ones.
Its protein carries out three separate steps in the same purine-making pathway. Keeping these steps linked helps cells produce these building blocks in a smooth, organized way.
The purines made with help from this gene are later used to build DNA and RNA. That supports normal copying of genetic instructions when cells grow and replace themselves.
Purines are also used to make molecules such as ATP and GTP, which cells use to transfer energy and send signals. By supporting purine production, the GART gene helps everyday cell activity run steadily.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and are part of normal human diversity, such as variation in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect 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
Variants in the GART gene can weaken the protein by changing its shape, making it less stable, or lowering its activity. In discussions of how GART gene variants affect enzyme activity, milder changes may leave some function intact, while more severe variants can shorten the protein or greatly reduce its activity. When both copies are strongly affected, GART deficiency may appear earlier and with broader features.
How variants are linked to conditions
Variants in the GART gene can cause a very rare inherited condition called GART deficiency, which may lead to developmental delay, low muscle tone, seizures, and growth concerns. This is the main well-established answer to how GART gene variants are linked to conditions. Research on more common GART gene changes and other health problems remains less certain.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widespread in the general population. Most do not have a direct effect on health and simply contribute to natural human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when multiple 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the GART gene. For many living with a GART-related change, risk depends mostly on the exact genetic change itself rather than clear lifestyle or environmental factors, so personal guidance from a doctor or genetic counselor can be helpful.
Inheritance of GART variants
For families learning how GART gene variants are inherited, the well-established pattern for GART-related disease is autosomal recessive. This means a child usually inherits one variant in the GART gene from each parent, and parents who each carry one variant are typically unaffected themselves. When both parents are carriers, each pregnancy has a 25% chance of resulting in a child with the condition, a 50% chance of a child who is also a carrier, and a 25% chance of a child who inherits neither familial variant.
What does my GART result mean for my family?
For families with a disease-causing GART result, the pattern is usually recessive, which means parents are often healthy carriers and brothers or sisters could also be affected or be carriers. Other close relatives, such as siblings of the parents, may also carry the same change and could want to learn whether it runs in the family.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the GART gene, genetic testing uses a blood or saliva sample. A lab reads the DNA sequence of the GART gene, either on its own or as part of a larger panel or exome test, to look for changes that may help explain a confirmed genetic diagnosis.
When should I consider getting a genetic test?
Genetic testing for the GART gene may be considered when a child has unexplained developmental delay, low muscle tone, seizures, or other signs of a very rare inherited condition that affects how the body makes certain important cell-building substances. It can also help if there is a family history of this condition.
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 type of variant involved. How the body works over time is also shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information adds context rather than certainty and is most helpful when viewed alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas such as medication response, these 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. Two people can take the same treatment at the same dose, yet one may get better results while the other may notice less benefit or more side effects. Part of the reason is that inherited differences can change how the body breaks down, moves, or responds to a drug. This kind of variation is common and helps explain why medication response is not the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes affect the way medications work. It studies links between genes and drugs to help explain why the same treatment can have different effects in different people. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support more informed and more personalized treatment choices. More detail on this topic is available in the LearnHub.
Drugs influenced by the GART gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about medicines, side effects, or treatment changes are best discussed with your doctor.