The ABCG2 gene helps move certain substances, including uric acid and some medicines, out of cells so the body can clear them. If it does not work well, uric acid may build up and raise the chance of gout or kidney stones, and your body may handle some drugs differently. Some differences in this gene can change how strongly these effects show up. ABCG2 matters in medicine, but it has not become widely known through celebrity stories or popular culture.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or to regulate processes in the body. Some genes provide the directions for producing proteins, the parts of cells that do much of the work. Other genes mostly help manage when certain processes happen, where they take place, 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, or medicines. For a deeper look at this topic, you can find more in the LearnHub.
Overview
ABCG2Gene function
What if the gene works
The ABCG2 gene helps move uric acid and other substances out of cells.
Its protein acts like a pump in the gut, liver, kidneys, and placenta, supporting waste removal and limiting entry of some compounds.
Risk
What if the gene does not work
Reduced function of the ABCG2 gene can limit uric acid removal, increasing the chance of high uric acid and gout. Milder and more severe variants can affect how early gout appears and how strong symptoms become.
Treatment
What does that mean for your treatment
For people with a loss-of-function variant in the ABCG2 gene, no gene-specific treatment or management approach is currently established in clinical guidelines. The ABCG2 gene is being studied as a biomarker for gout risk and urate-lowering treatment response, and as a cancer drug-resistance transporter that may shape future therapies.
Gene function
What if the gene works
Your body uses the ABCG2 gene to make a transport protein in cell membranes. This helps explain how the ABCG2 gene moves drugs and uric acid out of cells in the gut, liver, and kidneys. It also supports protective barriers in places such as the placenta and brain.
The ABCG2 gene makes a protein that uses cell energy to push selected substances out of cells. This outward flow helps cells keep a healthy internal balance.
In the gut, liver, and kidneys, its protein helps move compounds toward stool, bile, and urine. This supports the body’s normal clearing of many medicines, food related compounds, and other chemicals.
ABCG2 also helps move uric acid, a waste product made when your body breaks down natural materials from food and old cells. This supports steady uric acid handling through the gut and kidneys.
In the placenta and the blood-brain barrier (the filter between blood and brain), its protein helps limit how much of certain substances reach sensitive tissues. This adds an everyday layer of protection.
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, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effects and simply represent 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 ABCG2 gene can change the shape, stability, or cell-surface placement of its transporter protein, so it moves substances less effectively. Some ABCG2 gene variants only partly reduce activity, while more severe variants can sharply limit transport or leave little working protein at the cell surface. This range helps explain how ABCG2 gene variants affect protein function and why reduced urate transport may be linked to earlier or more noticeable gout in some people.
How variants are linked to conditions
Variants in the ABCG2 gene are most clearly linked to higher uric acid levels and a greater chance of gout, so ABCG2 gene variants and gout are often discussed together. These common changes influence risk rather than guarantee disease, and many people with them never develop symptoms. Rare variants in the ABCG2 gene can also cause the Jr(a−) blood type, which can matter in blood transfusion and pregnancy care.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely found in the general population. Most do not have a direct effect on health and instead represent normal human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a certain diagnosis, especially when several genes and environmental factors play a role. In some situations, though, a single well-studied variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For people with ABCG2 changes linked to high uric acid and gout, risk can rise further with alcohol use, a diet high in purine-rich foods such as red meat and some seafood, extra body weight, and reduced kidney function. These factors do not replace the gene effect, but they can make gout attacks or high uric acid more likely.
Inheritance of ABCG2 variants
The inheritance pattern for ABCG2-related findings depends on the specific change and what it is linked to. For the rare Jr(a−) blood type, ABCG2 variants are inherited in an autosomal recessive pattern, so a person usually receives one altered copy of the ABCG2 gene from each parent. By contrast, many ABCG2 variants linked to gout risk are inherited as common genetic risk factors and do not follow one clear-cut Mendelian pattern. In practical terms, ABCG2 inheritance can be recessive for the blood group trait, while other inherited changes may only influence tendency rather than determine a condition.
What does my ABCG2 result mean for my family?
For the rare ABCG2-related Jr-negative blood type, this usually runs in families in a recessive way. That means parents are often healthy carriers, and brothers or sisters may also have the same blood type or be carriers. This can matter for blood transfusions and during pregnancy, because blood matching may need extra attention.
Genetic information
Genetic testing
How you find out about variants
ABCG2 genetic testing usually uses a saliva or blood sample to look for variants in the ABCG2 gene. A lab reads the gene’s DNA code and compares it with the usual sequence, which can show whether you carry a specific variant and help clarify some test results or treatment choices.
When should I consider getting a genetic test?
There isn't yet a broadly established reason for most people to have ABCG2 genetic testing. It may sometimes come up when looking at unusual gout patterns or how certain medicines are handled, but the decision is best made with a doctor or genetic counselor based on your health and family history.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it reveals varies by the condition and the type of variant involved. Over time, many factors also shape how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result may offer 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
Variants in the ABCG2 gene can affect how your body handles rosuvastatin, a medicine used to lower cholesterol. Some people with reduced function ABCG2 variants, including ABCG2 c.421C>A, can have higher levels of rosuvastatin in the blood, which may raise the chance of side effects such as muscle symptoms. This helps explain why the same medication can work differently in different people. Genetic differences like this are common and can influence both how well a treatment works and how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics studies how genetic differences affect the way people respond to medications. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body processes it. This information can support more informed, more individualized treatment decisions. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the ABCG2 gene
When should I seek medical advice?
If you know you have an ABCG2 gene change, bring it up before starting or changing certain cholesterol-lowering medicines called statins. Some ABCG2 changes can affect how your body handles rosuvastatin, which can raise the chance of side effects in some people. Get medical advice promptly if muscle pain, unusual weakness, or dark urine starts after beginning a statin.
History
The ABCG2 gene entered medical research in the late 1990s, when scientists studying cancer cells found a protein that could push some medicines back out of the cell. It was first called the breast cancer resistance protein, or BCRP, because of the setting in which it was discovered. From these first observations, research expanded steadily. Scientists later recognized that this gene was not limited to cancer research and was also important in work on drug handling, uric acid levels, and gout. As more genetic studies were published, ABCG2 became a familiar name in pharmacogenetics, the field that looks at how genes can shape medicine response. That shift helped move ABCG2 from a lab finding to a gene with broad clinical relevance.