TAS2R38 rs11568822: Understanding Your Bitter Taste Genetics
The rs11568822 variant is a genetic marker within the TAS2R38 gene that helps determine how individuals perceive bitter tastes. It is one of three key positions that form the classic PAV and AVI haplotypes, which influence sensitivity to bitter compounds found in many common vegetables.
What each genotype means
Bitter taste sensitivity
This genotype corresponds to the Valine (Val) variant at position 296, which is part of the functional PAV haplotype associated with the ability to perceive bitter compounds like those in brassica vegetables. Individuals with this genotype are more likely to be classified as 'tasters' or 'supertasters' who perceive these bitter flavors more intensely. Research suggests this functional receptor variant may also be linked to differences in dietary preferences and, in some studies, potential associations with healthy aging.
This genotype is common in many populations, with the PAV haplotype being one of the two predominant forms found globally.
Intermediate bitter taste sensitivity
Carrying one copy of each allele means you possess both the functional and non-functional versions of this receptor site. You may experience an intermediate level of bitter taste sensitivity compared to those who are homozygous for either the taster or non-taster variants. Your personal perception of bitter foods like kale or Brussels sprouts may fall somewhere in the middle of the spectrum.
This heterozygous genotype is frequently observed in populations where both the PAV and AVI haplotypes are common.
Reduced bitter taste sensitivity
This genotype corresponds to the Isoleucine (Ile) variant at position 296, which is part of the non-functional AVI haplotype. Individuals with this genotype are often classified as 'non-tasters' and may have a reduced ability to perceive the bitter compounds found in certain vegetables. This reduced sensitivity can influence food preferences, as these individuals may find bitter-tasting foods less intense or more palatable than others do.
This genotype is widely distributed, with the AVI haplotype representing a significant portion of the global frequency for this gene.
What is the rs11568822 Variant?
The rs11568822 variant is a single nucleotide polymorphism (SNP) located within the TAS2R38 gene. In the context of human genetics, this SNP is specifically known for the Val296Ile amino acid substitution. It does not act alone; rather, it functions as the third position marker in a set of three closely linked SNPs that define the primary haplotypes of the TAS2R38 receptor. These haplotypes, most notably PAV (proline-alanine-valine) and AVI (alanine-valine-isoleucine), are the primary genetic determinants for how a person experiences the bitterness of certain chemical compounds. Because these three SNPs are in high linkage disequilibrium, they are often inherited together as a block, effectively acting as a single functional unit that dictates the structural shape and sensitivity of the bitter taste receptor on the surface of your taste buds.
The Role of the TAS2R38 Gene
The TAS2R38 gene encodes a seven-transmembrane G protein-coupled receptor. This protein is expressed on the surface of taste receptor cells and is specialized to detect glucosinolates, a class of bitter-tasting compounds naturally occurring in cruciferous vegetables like Brussels sprouts, kale, and broccoli. Beyond natural plant compounds, this receptor also binds to synthetic substances such as phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP). When these molecules bind to the receptor, they trigger a signaling cascade that the brain interprets as a bitter taste. The specific amino acid sequence determined by your genotype at rs11568822 and its neighboring SNPs dictates how effectively these molecules bind to the receptor. Consequently, this gene is a primary focus in sensory science for understanding why individuals have such vastly different reactions to the same foods, ranging from mild flavor to intense, unpleasant bitterness.
Research and Evidence Strength
Research into TAS2R38 is extensive, particularly regarding its role in sensory perception. The association between the PAV/AVI haplotypes and the ability to taste PROP or PTC is well-established and considered robust in the scientific literature. However, the evidence linking this specific genetic variation to broader health outcomes, such as dietary intake, body mass index, or weight management, is considered limited and often mixed. While some studies suggest that individuals who are 'supertasters' (often those with the PAV haplotype) may avoid bitter vegetables, other research indicates that cultural factors, repeated exposure, and other genetic modifiers play significant roles in food preference. Therefore, while the link between the genotype and the physical sensation of bitterness is strong, the leap from 'tasting bitterness' to 'predicting dietary health' is complex and not fully explained by this single variant alone.
What You Can and Cannot Do
Understanding your genotype for rs11568822 can provide a fascinating insight into why you might find certain vegetables intensely bitter compared to others. It is a tool for self-discovery regarding your sensory biology. However, it is important to recognize the limitations of this information. You cannot use this genetic data to diagnose a medical condition, nor should it be used to dictate a restrictive diet. Taste preference is a multifactorial trait influenced by environment, upbringing, and a wide array of other genetic factors. If you are concerned about your nutritional intake or have questions about how your diet affects your health, the best course of action is to consult with a registered dietitian or a healthcare professional. They can help you navigate food choices in a way that is healthy and enjoyable, regardless of your genetic predisposition to bitter taste sensitivity.
How common is this variant?
The minor allele frequency for this variant is approximately 0.45 in European populations and 0.15 in East Asian populations, reflecting significant ancestral diversity in bitter taste perception.
Frequently asked questions
Does having the 'taster' genotype mean I am a picky eater?
Not necessarily. While your genetics may make you more sensitive to bitter flavors, food preferences are shaped by many factors, including your environment, culture, and repeated exposure to different foods over time.
Can I change my bitter taste sensitivity?
Your genetic sequence is fixed, but your perception of taste can be influenced by habituation. Many people find that they become accustomed to the taste of bitter vegetables through repeated, positive culinary experiences.
Is this variant related to any diseases?
The TAS2R38 gene is primarily studied in the context of sensory perception. While some research has explored potential links to weight or dietary habits, there is no consensus that this variant causes or prevents specific diseases.
Should I get tested for this SNP?
Genetic testing for taste receptors is generally for personal interest rather than clinical utility. It does not provide actionable medical information, and you should not use it to make significant changes to your health or diet without professional guidance.
Sources & further reading
Educational information only, last refreshed 9/26/2026. 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.
Val262Ala substitution in TAS2R38 forming the middle polymorphic site of the classic AVI/PAV taste sensitivity haplotype.
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.