ABCB1 Gene rs2032582: What Your Genotype Means
The rs2032582 variant is a well-studied, tri-allelic genetic change (2677T>G/A) located in the ABCB1 gene, which plays a crucial role in how the body transports and clears medications. Research associates this variant with differences in drug response and a varying susceptibility to inflammatory bowel disease across different populations.
What each genotype means
Standard transporter activity
This genotype represents the most common form of the ABCB1 gene at this position. Research into this variant is ongoing, and while some studies suggest associations with drug response or inflammatory bowel disease susceptibility, results are often mixed or specific to certain populations. Please discuss any concerns regarding medication response or health risks with your clinician or pharmacist.
This is a common genotype found in many global populations, though frequencies vary significantly by ancestry.
Potential altered transporter function
This genotype involves one copy of the T allele and one copy of the G allele, which results in a change in the P-glycoprotein structure (Ser893Ala). Some studies have linked this variant to differences in drug transport or susceptibility to inflammatory bowel disease, but evidence is inconsistent across different ethnic groups. You should consult your healthcare provider regarding how this might influence your specific treatment plans.
This heterozygous genotype is frequently observed in diverse populations worldwide.
Potential altered transporter function
This genotype involves one copy of the T allele and one copy of the A allele, leading to a change in the P-glycoprotein structure (Ser893Thr). While this variant has been studied for its role in drug metabolism and disease risk, findings remain inconclusive and context-dependent. Always consult with your pharmacist or doctor before making changes to your medication regimen based on genetic information.
This genotype is present in various populations, though it is generally less common than the homozygous T genotype.
Variant transporter profile
Carrying two copies of the G allele results in the Ala893 variant of the P-glycoprotein transporter. Research has explored its association with inflammatory bowel disease and variations in drug toxicity, but these associations are not universal and depend heavily on the specific drug and population studied. Please discuss your genetic profile with a medical professional to understand its relevance to your health.
This genotype is found at varying frequencies across different global populations.
Variant transporter profile
Carrying two copies of the A allele results in the Thr893 variant of the P-glycoprotein transporter. While this variant is documented in genetic databases, its clinical impact is not fully established and remains a subject of scientific investigation. You should speak with your clinician to determine if this information is relevant to your personal health or medication management.
This is a less common genotype compared to those containing the T allele.
Mixed variant transporter profile
This genotype consists of one G allele and one A allele, both of which are non-reference variants at this position. The functional impact of this specific combination on P-glycoprotein activity is not well-defined in current literature. Please consult your healthcare provider to discuss how this genetic information may or may not apply to your clinical situation.
This is a rare genotype observed in some populations.
What is rs2032582 and the ABCB1 Gene?
The rs2032582 variant is located on chromosome 7 within the ABCB1 gene, historically known as MDR1. This gene provides instructions for making P-glycoprotein (P-gp), an essential protein that acts as an ATP-dependent drug efflux pump. P-glycoprotein sits in cell membranes and actively pumps foreign substances, including many common medications and toxins, out of cells. This process is a critical part of the body's defense system, directly influencing how drugs are absorbed in the intestines, distributed through the blood-brain barrier, and excreted by the liver and kidneys. The rs2032582 variant is a missense mutation, meaning it changes a single amino acid in the resulting protein (specifically, Ser893Ala or Ser893Thr). Because it is tri-allelic, the DNA letter at this position can be a T, G, or A. These subtle structural changes can alter how efficiently P-glycoprotein transports its substrates, making this variant a major focus in pharmacogenomics, which is the study of how genes affect a person's response to drugs.
Pharmacogenomics and Drug Response
Because P-glycoprotein interacts with a vast array of medications, researchers have extensively studied rs2032582 to understand its impact on drug efficacy and side effects. The variant has been investigated in relation to antidepressants like SNRIs, blood thinners such as rivaroxaban, statins, and immunosuppressants used after organ transplants. For example, some studies suggest that individuals with the TT genotype may experience different clinical responses to certain antidepressants compared to those with G or A alleles. However, the scientific evidence remains mixed and highly complex. According to the Pharmacogenomics Knowledgebase, the clinical evidence for rs2032582 altering antidepressant efficacy is currently considered Level 3, meaning the associations are recognized but may lack the definitive consensus required to change standard medical practice. The impact of this variant often depends heavily on the specific drug being taken, the presence of other genetic variants, and environmental factors. Therefore, while rs2032582 is a strong candidate for influencing drug disposition, it is rarely used in isolation to determine prescriptions.
Association with Inflammatory Bowel Disease
Beyond drug transport, rs2032582 has been strongly linked to a person's susceptibility to inflammatory bowel disease, a condition characterized by chronic inflammation of the gastrointestinal tract. The ABCB1 gene is highly expressed in the intestines, where it helps maintain the barrier against gut bacteria and toxins. Reduced function of P-glycoprotein could theoretically allow more inflammatory triggers to breach the intestinal lining. Large meta-analyses have demonstrated that the rs2032582 variant is significantly associated with inflammatory bowel disease risk, but this effect is highly dependent on a person's ancestry. The statistical association is most prominent in Asian and African populations, where specific alleles correlate with an increased risk of developing the disease, particularly Crohn's disease. In contrast, studies focusing on Caucasian populations have generally found no significant association between this variant and disease susceptibility. This highlights the importance of genetic background when interpreting the clinical relevance of rs2032582, as the same genetic change can have vastly different implications depending on a person's ethnicity.
What You Can and Cannot Do With This Information
If you discover your rs2032582 genotype through a direct-to-consumer DNA test, it is important to view the results as educational rather than diagnostic. While this variant is a well-documented factor in pharmacogenomics and inflammatory bowel disease research, it does not guarantee that you will develop a gastrointestinal condition, nor does it mean a specific medication will definitively fail or cause side effects. The human body's processing of drugs is incredibly complex, relying on multiple genes, liver enzymes, diet, age, and overall health. You cannot use this genetic information to self-diagnose or independently alter your medication dosages. Doing so can be dangerous and lead to adverse health outcomes. If you are taking medications known to be transported by P-glycoprotein and you have concerns about their efficacy or side effects, you should share your genetic report with a healthcare provider. Always discuss potential dosing adjustments or alternative therapies with a qualified clinician or pharmacist who can evaluate your complete medical profile.
How common is this variant?
The frequency of the rs2032582 alleles varies significantly across different global populations. For example, the T allele frequency ranges from as low as 2% to as high as 65% depending on ethnic background, with the A allele generally being the rarest.
Frequently asked questions
What is the ABCB1 gene?
The ABCB1 gene provides instructions for making P-glycoprotein, a crucial protein that pumps foreign substances and drugs out of cells. It plays a major role in protecting the body from toxins and determining how medications are absorbed and excreted.
Does the rs2032582 variant mean my medications won't work?
No. While rs2032582 can influence how efficiently your body transports certain drugs, it is only one of many factors that determine medication efficacy. You should never stop or change your medication based on this genetic result without consulting a doctor.
Is rs2032582 linked to Crohn's disease?
Yes, research has found a statistical association between this variant and susceptibility to inflammatory bowel diseases, including Crohn's disease. However, this association is mostly observed in Asian and African populations, and having the variant does not guarantee you will develop the condition.
Why does this variant have three different letters (T, G, A)?
Most genetic variants involve a swap between just two DNA letters, but rs2032582 is tri-allelic, meaning three different variations can occur at this specific location. Each letter codes for a slightly different amino acid, which can subtly alter the shape and function of the resulting protein.
Should I get tested for the ABCB1 rs2032582 variant?
Routine testing for this specific variant is not currently standard medical practice for most conditions. However, it is often included in comprehensive pharmacogenomic panels that doctors may order if you are experiencing unusual side effects or poor responses to certain medications.
Sources & further reading
Educational information only, last refreshed 9/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is studied for its influence on the pharmacokinetics of immunosuppressive drugs like cyclosporine and tacrolimus in transplant patients.
Synonymous variant (c.3435C>T) in ABCB1 linked to altered P-glycoprotein expression and multi-drug transporter pharmacokinetics.
Nonsynonymous variant in ABCB1 altering P-glycoprotein transporter kinetics.
A variant associated with potential differences in drug absorption and clinical outcomes in patients undergoing specific pharmacological therapies.
This SNP is linked to variations in the pharmacokinetics of drugs that are substrates for the ABCB1 transporter protein.
Synonymous exon 26 variant in ABCB1 linked to altered mRNA stability and variable response to multiple cardiovascular medications.