TAS2R38 rs1726867: What Your Genotype Means
The rs1726867 variant is a specific genetic change within the TAS2R38 gene that helps determine how individuals perceive bitter tastes. It is a central component of the well-studied PAV and AVI haplotypes, which categorize people into different bitter-tasting sensitivity groups.
What each genotype means
High bitter sensitivity
You carry two copies of the C allele at rs1726867, which corresponds to the Ala262 variant and is strongly linked with the functional PAV taster haplotype. People with this genotype generally perceive bitter thiourea compounds, such as phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP), as intensely bitter. This can statistically influence dietary preferences, such as lower liking or intake of bitter cruciferous vegetables and certain bitter alcoholic beverages, though real-world dietary patterns depend heavily on culture and learned habits.
Found in approximately 25% to 35% of people of European descent and roughly 50% or more in many East Asian populations where the taster allele is more prevalent.
Intermediate bitter sensitivity
You carry one taster allele (C) and one non-taster allele (T), reflecting heterozygous taste receptor sensitivity typically associated with a PAV/AVI diplotype. Individuals with this genotype typically display an intermediate sensitivity threshold to bitter thiourea compounds like PTC and PROP. While you are likely able to perceive bitterness in these substances, the intensity is generally lower than in homozygous tasters, and dietary associations remain modest and variable across studies.
Carried by approximately 45% to 50% of people globally, representing the most common genotype in European and American cohorts.
Low bitter sensitivity
You carry two copies of the T allele at rs1726867, corresponding to the Val262 variant tightly linked to the non-taster AVI haplotype. People with this genotype generally cannot perceive or have a very high detection threshold for bitter thiourea compounds such as PTC and PROP. Research observes that non-tasters may show higher tolerance for bitter foods like brassica vegetables, coffee, or dark beer, although actual nutrient intake and health outcomes are multifaceted and weakly correlated with this single trait marker alone.
Found in about 20% to 25% of individuals of European ancestry, but occurs at significantly lower frequencies in East Asian populations.
Understanding the rs1726867 Variant
The rs1726867 variant is a single nucleotide polymorphism (SNP) located within the TAS2R38 gene. This specific variant results in a Val262Ala amino acid substitution, meaning that at this position in the protein, some individuals have a valine while others have an alanine. This SNP does not act in isolation; it is one of three common variants in the TAS2R38 gene that are inherited together as a block, known as a haplotype. These haplotypes, most notably PAV (Proline-Alanine-Valine) and AVI (Alanine-Valine-Isoleucine), dictate the functional structure of the bitter taste receptor. Because rs1726867 sits in the middle of this functional sequence, it serves as a critical marker for identifying which version of the receptor an individual possesses. Understanding this variant is essential for researchers studying why people have such vastly different reactions to the same bitter-tasting foods.
The Role of the TAS2R38 Gene
The TAS2R38 gene provides instructions for making a protein that functions as a bitter taste receptor on the surface of taste bud cells. This receptor is specifically tuned to detect certain bitter compounds, including those found in cruciferous vegetables like broccoli and kale, as well as synthetic compounds like 6-n-propylthiouracil (PROP). When these bitter molecules bind to the receptor, they trigger a signal to the brain that we interpret as a bitter taste. Beyond the tongue, recent research has identified TAS2R38 receptors in other parts of the body, including the gut, where they may play a role in sensing nutrients and regulating hormones like GLP-1. Because the receptor's shape is determined by the specific amino acids encoded by the TAS2R38 gene, small genetic changes can significantly alter how strongly a person perceives bitterness, which in turn can influence their food preferences and dietary choices.
Research Associations and Evidence
Scientific research has consistently linked TAS2R38 haplotypes to bitter taste sensitivity. Individuals carrying the PAV haplotype are generally considered 'tasters' or 'supertasters' because their receptors are highly sensitive to bitter compounds. Conversely, those with the AVI haplotype are often 'non-tasters' with a reduced ability to perceive these specific bitter flavors. These differences have been associated with variations in vegetable intake, as individuals who perceive high bitterness may be less likely to consume certain bitter vegetables. Some studies have also explored potential links between these genotypes and other health outcomes, such as body mass index or metabolic markers like postprandial glucose levels, though the evidence for these broader health associations remains limited and sometimes mixed. It is important to note that while genetics play a significant role in taste, environmental factors, culture, and repeated exposure to foods also heavily influence individual dietary habits.
Population Frequency
The TAS2R38 haplotypes are widely distributed across global populations, with the PAV and AVI forms being the most common. Research indicates that the frequency of these haplotypes can vary significantly depending on ancestral background. In many studies, the AVI haplotype is found at a slightly higher frequency than the PAV haplotype, though both are prevalent enough that most populations contain a mix of tasters and non-tasters. Because these variants are so common, it is very typical for individuals to carry at least one copy of either the PAV or AVI haplotype. The global minor allele frequency for the rs1726867 variant is approximately 0.44, reflecting this widespread distribution.
Interpreting Your Genetic Information
Knowing your genotype for rs1726867 can provide insight into why you might find certain foods more or less bitter than others. However, it is crucial to understand that this information is not a diagnostic tool. Your taste perception is a complex trait influenced by many genes, not just TAS2R38, as well as your personal history and environment. You cannot use this information to predict specific health outcomes or to diagnose any medical condition. If you are concerned about your diet, nutritional intake, or metabolic health, the best course of action is to consult with a registered dietitian or a healthcare provider. They can help you interpret your dietary habits in the context of your overall health and provide personalized guidance that goes far beyond what a single genetic variant can tell you.
How common is this variant?
The rs1726867 variant is common globally, with a minor allele frequency of approximately 0.44. The resulting PAV and AVI haplotypes are found at high frequencies across diverse ancestral populations.
Frequently asked questions
Does my TAS2R38 genotype mean I am a supertaster?
Having the PAV/PAV genotype is often associated with being a 'supertaster' because it results in a highly functional bitter taste receptor. However, 'supertaster' status is a complex phenotype that can also be influenced by the density of taste buds on your tongue.
Can I change my bitter taste sensitivity?
While your genetics are fixed, your perception of taste can be influenced by repeated exposure to foods. Many people find that their preference for bitter vegetables increases over time as they incorporate them into their regular diet.
Is this variant linked to any diseases?
Some research has explored associations between TAS2R38 and conditions like obesity or metabolic health, but the evidence is currently limited. This variant is primarily studied for its role in taste perception rather than as a direct cause of disease.
Should I change my diet based on this result?
You should not make significant dietary changes based solely on a genetic test. If you have concerns about your nutrition, please consult a registered dietitian or your doctor to discuss a balanced approach to eating.
Sources & further reading
Educational information only, last refreshed 10/11/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A functional variant in the TAS2R38 gene that, as part of a three-SNP haplotype, determines the ability to taste bitter compounds like PTC.
One of the three classical missense variants defining the PAV bitter taster haplotype for phenylthiocarbamide and cruciferous vegetables.
Key missense polymorphism contributing to phenylthiocarbamide (PTC) and propylthiouracil (PROP) bitter taste taster status.
Functional marker affecting bitter taste perception of phenylthiocarbamide (PTC).
A key SNP in the TAS2R38 gene (part of the PAV/AVI haplotype) determining sensitivity to bitter compounds like PTC and PROP.
Third position marker (Val296Ile) completing the classic PAV/AVI haplotype determining sensitivity to the bitter glucosinolates found in raw brassica vegetables such as Brussels sprouts and kale.