CYP1A2 rs11854147: Understanding Your Caffeine Metabolism
The rs11854147 variant is a common genetic change located within the CYP1A2 gene, which plays a central role in how the body metabolizes caffeine and various medications. Research investigates how this variant may influence the speed at which individuals process caffeine, potentially affecting their physiological response to coffee consumption.
What each genotype means
Common variant genotype
This genotype represents the C allele at the rs11854147 position. Research on this specific variant is limited compared to functional coding variants in the CYP1A2 gene, and its direct impact on drug metabolism or caffeine sensitivity remains to be fully established. Please discuss any concerns regarding medication response or caffeine intake with your clinician or pharmacist.
Carried by approximately 49% of non-Hispanic White individuals, though frequencies vary significantly across other global populations.
Common variant genotype
This genotype indicates you carry one copy of the C allele and one copy of the T allele at this location. The functional significance of this specific variant in the CYP1A2 gene is not well-defined in current clinical literature. You should consult with your healthcare provider or pharmacist regarding any questions about how your genetics might influence your response to medications.
Carried by approximately 39% of non-Hispanic White individuals, with varying prevalence in other ancestral groups.
Common variant genotype
This genotype represents the T allele at the rs11854147 position. There is currently insufficient evidence to suggest that this specific variant significantly alters CYP1A2 enzyme activity or clinical outcomes. Always consult your physician or pharmacist before making changes to your medication regimen or interpreting your response to caffeine based on genetic data.
Carried by approximately 12% of non-Hispanic White individuals, with frequencies differing across other global populations.
What is rs11854147?
The rs11854147 variant is a single-nucleotide polymorphism (SNP) located within the CYP1A2 gene. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is situated in a region of the genome that helps regulate the activity of the CYP1A2 enzyme. Because this enzyme is responsible for breaking down a wide variety of substances, including caffeine and certain clinical drugs, variations in the gene can lead to differences in how efficiently these substances are cleared from the bloodstream. Scientists study this variant to understand why people experience different effects from the same amount of caffeine or medication, as these genetic differences can influence the concentration of these substances in the body over time.
The Role of the CYP1A2 Gene
The CYP1A2 gene provides instructions for making an enzyme called cytochrome P450 1A2. This enzyme is primarily found in the liver and is a member of the cytochrome P450 family, a group of proteins essential for detoxifying and metabolizing foreign substances. CYP1A2 is particularly well-known for its role in the metabolism of caffeine, accounting for approximately 95% of caffeine clearance in humans. Beyond caffeine, this enzyme also processes various medications, including certain antidepressants, antipsychotics, and muscle relaxants. The activity level of this enzyme can be influenced by both genetic factors, such as SNPs, and environmental factors, such as smoking or the use of oral contraceptives. Because of its broad role in drug metabolism, the CYP1A2 gene is a major focus in the field of pharmacogenomics, which seeks to understand how genetic variations affect individual responses to medical treatments.
Research and Evidence
Research into CYP1A2 variants often focuses on how they categorize individuals into 'fast' or 'slow' metabolizers of caffeine. While much of the literature highlights the well-studied rs762551 variant, rs11854147 is also investigated for its potential impact on enzyme function. Studies have explored whether these genetic differences correlate with health outcomes, such as the risk of cardiovascular disease or kidney dysfunction, particularly in the context of heavy coffee consumption. However, the evidence is often mixed. For instance, while some early studies suggested that slow metabolizers might face higher risks from heavy coffee intake, large-scale analyses, such as those using the UK Biobank, have sometimes found no significant interaction between these genotypes and cardiovascular disease risk. This indicates that while genetics play a role in metabolism, other factors like diet, lifestyle, and overall health are equally important. The evidence for rs11854147 specifically is considered moderate, and findings are often context-dependent.
What You Can Do With This Information
Understanding your genetic profile regarding caffeine metabolism can provide insight into why you might feel jittery or anxious after a single cup of coffee, while others can consume several without issue. However, it is important to recognize that this information is for educational purposes and should not be used to diagnose health conditions or make medical decisions. If you are concerned about how your body processes specific medications, you should consult with your clinician or pharmacist. They can provide guidance based on your full medical history and current treatments. Never change your medication dosage or stop taking a prescribed drug based on genetic test results without professional medical advice. Genetic variants are only one piece of a complex puzzle that includes your environment, lifestyle, and other biological factors.
How common is this variant?
The rs11854147 variant is considered common, with its frequency varying across different global populations. It is widely distributed, and most individuals carry at least one copy of the common allele.
Frequently asked questions
Does my CYP1A2 genotype mean I should stop drinking coffee?
No, your genotype does not dictate your lifestyle. It simply provides information on how your body might metabolize caffeine, which can help you understand your personal sensitivity to it.
Can a genetic test tell me which medications are safe for me?
Pharmacogenomic testing can provide information about how your body processes certain drugs, but it is not a substitute for clinical judgment. Always discuss any genetic findings with your doctor before making changes to your medication.
Is rs11854147 the only variant that affects caffeine metabolism?
No, caffeine metabolism is a complex trait influenced by multiple genetic variants, including those in the CYP1A2 and ADORA2A genes, as well as environmental factors like smoking and diet.
Where can I find more information about my specific genetic results?
You should consult with a certified genetic counselor or your primary care physician. They can help interpret your results in the context of your overall health and medical history.
Sources & further reading
Educational information only, last refreshed 10/6/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the CYP1A2 gene influences the hepatic metabolism rate of caffeine and is a key marker for individual differences in caffeine clearance.
Intronic marker associated with CYP1A2 enzyme activity and caffeine metabolism rates.
Modulates CYP1A2 inducibility affecting the rate of caffeine metabolism and clearance.
Regulatory variant associated with CYP1A2 enzyme activity, influencing the rate of caffeine metabolism and habitual coffee consumption.
A common variant in the CYP1A2 gene associated with caffeine metabolism rates.
Located in intron 1 of CYP1A2, this variant modulates inducible enzyme activity, altering systemic caffeine clearance and individual susceptibility to caffeine-related blood pressure increases.