The ABCC2 gene helps liver cells move bilirubin, other waste products, and some medicines into bile so they can leave the body. If it does not work well, bilirubin can build up and cause jaundice, a yellow tint of the skin or eyes, as seen in Dubin-Johnson syndrome. This gene can play a role in how your body responds to some medicines. Many variants are harmless, while a few can change how the liver clears certain drugs.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions they can use to make molecules or direct processes in the body. Some genes hold the instructions for producing proteins, the parts of cells that do much of the work. Other genes mostly help regulate when certain processes happen, where they happen, and how strongly they operate. As a group, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. To explore this subject further, you can read more in the LearnHub.
Overview
ABCC2Gene function
What if the gene works
The ABCC2 gene helps make a transport protein that moves bilirubin, medicines, and other waste products out of cells. This supports bile flow and helps the liver, intestines, and kidneys clear substances from the body.
Risk
What if the gene does not work
Variants in the ABCC2 gene most often cause Dubin-Johnson syndrome, leading to a long lasting buildup of bilirubin in the blood and sometimes jaundice. Milder to more severe variants can leave different amounts of transporter activity, influencing when symptoms appear and how noticeable they are.
Treatment
What does that mean for your treatment
No ABCC2-specific treatment or management approach is currently established. The ABCC2 gene is being studied as a marker of how the body handles some medicines, including certain chemotherapy drugs, but this has not led to guideline-based drug choices for people with pathogenic ABCC2 variants.
Conditions associated with ABCC2
Gene function
What if the gene works
Your liver and gut use the ABCC2 gene to move certain waste products and medicine byproducts out of cells. Its protein sits in the cell membrane and works as an energy powered pump. This steady transport supports everyday cleanup and helps explain what the ABCC2 gene does in the liver and intestines.
In liver cells, the ABCC2 gene helps move processed waste out through the side that drains into bile. This lets the body send selected substances toward the intestine for removal.
One important job is transporting conjugated bilirubin (bilirubin prepared by the liver for removal). This supports the normal clearance of bilirubin made when old red blood cells are broken down.
The ABCC2 gene also helps transport some medicines and their breakdown products out of cells. In daily cell function, it supports how the liver, intestines, and kidneys handle substances that need to be cleared.
Its protein works at the outward facing surface of certain cells, where material is released into bile, urine, or the gut. This one way flow helps normal body cleanup keep moving.
What is a variant?
A genetic variant is a minor change in the DNA sequence of a gene. These changes are common and are part of normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, however, a variant can change how a gene functions to a greater degree and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
ABCC2 gene variants affect protein function by changing how much of the transporter is made, how well it folds, and whether it reaches the cell membrane where it needs to sit. Some variants mainly reduce transport activity, while more disruptive variants can leave little or no working protein. In the ABCC2 gene, milder changes may preserve some function, while severe variants are more often linked to earlier or clearer features of Dubin-Johnson syndrome.
How variants are linked to conditions
Among ABCC2 gene variants linked to conditions, the clearest finding is Dubin-Johnson syndrome, an inherited liver condition that causes ongoing or intermittent jaundice from a buildup of bilirubin. People with this diagnosis often feel well overall, though some may notice yellowing of the eyes or skin, especially during illness, pregnancy, or with certain medicines. Other changes in the ABCC2 gene have been studied for links to drug response and liver test changes, but Dubin-Johnson syndrome is the main well-established ABCC2-related condition.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widespread in the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, especially when multiple genes and environmental factors also contribute. In some cases, 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 everyday factors that clearly increase or reduce health risk related to the ABCC2 gene. Some changes in ABCC2 are linked to liver-related conditions or differences in how the body handles certain medicines, but the effect can vary from one person to another.
Inheritance of ABCC2 variants
For families asking about the ABCC2 gene inheritance pattern, the best established condition linked to this gene, Dubin-Johnson syndrome, is inherited in an autosomal recessive way. This means a person usually develops the condition only when they inherit two ABCC2 gene variants, one from each parent. When both parents are carriers, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of a child with neither familial variant. Because the ABCC2 gene is on chromosome 10, this pattern can affect males and females equally.
What does my ABCC2 result mean for my family?
For ABCC2, family meaning is usually discussed in relation to Dubin-Johnson syndrome, an inherited liver condition that is passed down in a recessive way. Parents of someone with this result are often healthy carriers, and brothers or sisters may also have the condition or be carriers. Children are usually carriers if the other parent does not also carry an ABCC2 change, but the family picture depends on the exact result.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry variants in the ABCC2 gene, ABCC2 genetic testing uses a blood or saliva sample. A lab reads the DNA sequence and, in some tests, checks for missing or extra pieces. Results may identify a benign variant, a risk linked change, or a pathogenic variant, depending on the reason for testing.
When should I consider getting a genetic test?
Consider testing if you or your child has ongoing jaundice or repeated blood tests showing high direct bilirubin, especially when no other cause is found or it seems to run in the family. ABCC2 testing can help confirm Dubin-Johnson syndrome, an inherited liver condition that usually causes a harmless buildup of yellow pigment in the blood.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, 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 most helpful when viewed alongside other parts of care. In other situations, a genetic result may offer 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 people respond to medicines. Small differences in genes can change how the body absorbs, moves, breaks down, or clears a drug, so the same treatment may work better for one person than for another. These differences are common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes affect medication response. It studies gene and drug patterns to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body handles it. This information can support more informed and more individualized treatment decisions. To explore this topic further, you can learn more in the LearnHub.
Drugs influenced by the ABCC2 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 well a treatment is working are best discussed with your doctor. ABCC2 has been studied for possible effects on how the body handles some medicines, including certain cancer treatments and other drugs cleared through the liver, but these findings are not used routinely to direct care.
History
ABCC2 came into focus through studies of Dubin-Johnson syndrome, a rare inherited cause of long term jaundice first described in the 1950s. Initially understood only through visible traits, later recognized as tied to a specific gene, this condition helped researchers connect liver pigment handling with a specific transporter. In the 1990s, scientists identified the ABCC2 gene as the cause in many affected families, linking earlier clinical observations to modern genetics. From these first observations, research expanded steadily. ABCC2 then became important beyond rare liver conditions because it also helped shape research on how the body handles certain medicines. Over time, this work made ABCC2 a recognized part of both inherited liver disease and pharmacogenetics.