ITGA6 rs115218289: Understanding Peanut Allergy Genetic Associations
The genetic variant rs115218289 is a single nucleotide polymorphism located near the ITGA6 gene on chromosome 2. Research has identified this locus as having a genome-wide significant association with the risk of developing a peanut allergy.
What each genotype means
Typical peanut allergy risk
You carry two copies of the common reference allele at rs115218289 near the ITGA6 gene. In published genome-wide association studies, this genotype is not associated with an increased genetic susceptibility to peanut allergy. However, overall allergy risk is complex and influenced by many other genetic variants and environmental factors.
Carried by the vast majority of individuals, representing approximately 90% to 95% of people in European populations and even higher proportions in most other ancestries.
Moderately increased risk
You carry one copy of the low-frequency T risk allele near ITGA6. Large-scale genome-wide association and meta-analysis studies have linked the presence of this allele to a statistically higher risk of developing peanut allergy compared to the general population. This genetic marker does not diagnose an allergy or guarantee you will develop one, as environmental exposures and other loci play substantial roles.
Found in approximately 4% to 9% of people of European ancestry, but is relatively uncommon or rare in African and East Asian populations.
Higher genetic predisposition
You carry two copies of the T risk allele near ITGA6. Research shows that having this genotype is associated with a statistically higher relative risk of peanut allergy in study cohorts compared to carrying the common genotype. This finding indicates an underlying statistical predisposition rather than a definitive diagnosis of food allergy.
Very rare across all global ancestries, occurring in fewer than 0.3% of individuals of European descent.
What is rs115218289?
The variant rs115218289 is a specific change in the DNA sequence located on chromosome 2. In genetic studies, it is often identified by its position near the ITGA6 gene, which encodes the integrin subunit alpha 6 protein. This variant is categorized as a trait-associated locus, meaning that individuals carrying specific versions of this DNA sequence may show a statistical difference in their likelihood of developing certain conditions compared to those who do not. It was identified through genome-wide association studies (GWAS), which scan the entire human genome to find common genetic variations that occur more frequently in people with a specific health condition than in those without it. Because this variant is located in a region that may influence gene regulation, researchers study it to understand how subtle changes in our genetic code might contribute to complex immune-related traits like food allergies.
The Role of the ITGA6 Gene
The ITGA6 gene provides the instructions for creating the alpha 6 subunit of two important proteins: alpha 6 beta 4 integrin and alpha 6 beta 1 integrin. These proteins act as cellular anchors, helping cells attach to the surrounding environment. For example, alpha 6 beta 4 integrin is essential for maintaining the structural integrity of the skin by holding layers together in structures called hemidesmosomes. While mutations that cause a loss of function in this gene are linked to rare skin blistering conditions, the variant rs115218289 is not a disease-causing mutation in that sense. Instead, it is a common variation that may subtly influence how the ITGA6 gene is expressed or regulated. By studying how this gene functions in tissues, scientists hope to better understand the biological pathways that might be involved in the development of food allergies, particularly how the body's immune system interacts with environmental triggers.
Evidence and Peanut Allergy Risk
The association between rs115218289 and peanut allergy is supported by strong evidence from large-scale genetic studies. In a significant meta-analysis involving multiple international cohorts—including participants from Australia, Germany, the Netherlands, Canada, and the United States—researchers found that this variant reached genome-wide significance in relation to peanut allergy risk. A p-value of 1.80 × 10^-8 was reported in these studies, which is well below the standard threshold for genome-wide significance. While this statistical link is robust, it is important to note that food allergies are complex, multifactorial conditions. They are influenced by a combination of genetic factors, environmental exposures, and epigenetic changes. Therefore, while rs115218289 is a recognized genetic marker for risk, it does not act as a sole cause of peanut allergy. The presence of this variant does not guarantee that an individual will develop an allergy, nor does its absence guarantee protection.
Interpreting Your Genetic Information
If you have received information about your status for rs115218289, it is important to view it within the context of current scientific understanding. This variant is a tool for researchers to identify biological pathways involved in immune responses, but it is not a diagnostic test for peanut allergy. Genetic associations are statistical observations across large populations and cannot predict an individual's health outcome with certainty. You cannot use this information to diagnose yourself or to make changes to your diet or medical care. If you have concerns about food allergies, the most reliable approach is to consult with a board-certified allergist or a healthcare professional. They can perform clinical assessments, such as skin prick tests or blood tests, which are the standard for diagnosing food allergies. Always discuss any health-related questions or concerns with your doctor rather than relying solely on genetic data.
How common is this variant?
The frequency of the rs115218289 variant is variable and depends significantly on an individual's ancestral background.
Frequently asked questions
Does having the rs115218289 variant mean I have a peanut allergy?
No. This variant is a statistical marker associated with an increased risk of peanut allergy in large populations, but it is not a diagnostic test. Many people with this variant do not have a peanut allergy, and many people with a peanut allergy do not carry this variant.
Can I use this genetic information to change my diet?
You should not change your diet based on this genetic information. Dietary decisions, especially regarding potential allergens, should only be made under the guidance of a qualified healthcare professional or allergist.
How was the link between ITGA6 and peanut allergy discovered?
The link was discovered through genome-wide association studies (GWAS), which compare the DNA of thousands of people with peanut allergies against those without. Researchers identified that the rs115218289 variant appeared more frequently in the group with the allergy.
Is this variant the only cause of peanut allergies?
No. Peanut allergies are complex and involve many different genes, as well as environmental factors. This variant is just one of many genetic markers that may contribute to an individual's overall risk profile.
Sources & further reading
Educational information only, last refreshed 10/27/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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