HLA-DQA1 rs9271700: What Your Genotype Means
The rs9271700 variant is a genetic marker located within the HLA-DQA1 gene, a region critical for immune system function. Research has identified this variant as having a potential association with the risk of developing peanut and tree nut allergies.
What each genotype means
Typical nut allergy risk
You carry two copies of the common C allele at rs9271700. Published genome-wide association studies link this baseline genotype with standard population-level susceptibility to peanut and tree nut allergies. Having this genotype does not guarantee freedom from allergies, as allergic disease risk involves complex environmental and multigenic interactions.
Carried by roughly 38% to 40% of individuals of European ancestry and approximately 58% of individuals of East Asian ancestry.
Modestly increased allergy risk
You carry one copy of the T risk allele at rs9271700 near HLA-DQA1. Research associations indicate a modest statistical increase in susceptibility to peanut and tree nut sensitization compared to non-carriers. Because evidence for this regulatory marker is classified as limited and modulated by environmental exposures, carrier status does not diagnose an allergy.
Carried by approximately 47% of people of European ancestry and roughly 36% of individuals of East Asian ancestry.
Elevated nut allergy risk
You carry two copies of the T risk allele at rs9271700. In genetic studies, homozygosity for this allele is associated with the highest statistical risk within this locus for developing peanut and tree nut allergies. However, clinical allergy development depends heavily on immune history and other genetic factors, so this genetic finding alone cannot determine allergic status.
Carried by roughly 14% to 15% of individuals of European descent and about 6% of people of East Asian descent.
Understanding the rs9271700 Variant
The rs9271700 variant is a single nucleotide polymorphism (SNP) situated within the HLA-DQA1 gene on chromosome 6. This region is part of the human leukocyte antigen (HLA) complex, which is essential for the body's immune response. The HLA complex helps the immune system distinguish between the body's own proteins and foreign invaders like bacteria or viruses. Because this variant is located in a highly complex and variable part of the genome, it is often studied in the context of how the immune system recognizes specific molecules. Scientists use SNPs like rs9271700 as signposts to investigate how variations in this region might influence an individual's susceptibility to various immune-related conditions, including food sensitivities.
The Role of the HLA-DQA1 Gene
The HLA-DQA1 gene provides instructions for making a protein that forms part of the HLA class II molecule. This molecule acts as a sensor on the surface of immune cells, capturing small pieces of proteins (peptides) and presenting them to T-cells. By showing these peptides to the immune system, the HLA-DQA1 protein helps determine whether an immune response should be triggered. When this process functions correctly, it protects the body from infection. However, variations in the HLA-DQA1 gene can alter the shape of the binding groove where these peptides are held. This change may influence which specific proteins the immune system identifies as threats, potentially contributing to the development of allergies or autoimmune conditions.
Research and Evidence Strength
Current research into rs9271700 and its link to peanut and tree nut allergies is considered to have limited evidence strength. While genome-wide association studies (GWAS) have identified signals in the HLA region related to food allergies, the specific impact of rs9271700 is still being characterized. Some studies suggest that variations in the HLA-DQA1 region can modulate how the immune system interacts with peanut proteins, potentially influencing the risk of allergy. However, food allergies are complex, involving a combination of genetic factors, environmental exposures, and early-life dietary habits. Because of this complexity, a single genetic variant like rs9271700 is rarely a definitive predictor of whether someone will develop an allergy. The scientific community continues to investigate these associations to better understand the underlying biological mechanisms.
What This Information Means for You
It is important to understand that having a specific genotype at the rs9271700 location does not mean you will or will not develop a food allergy. Genetic associations observed in research studies represent statistical trends across large populations, not individual medical predictions. If you are concerned about food allergies, it is essential to consult with a qualified healthcare provider or an allergist. They can perform clinical assessments, such as skin prick tests or blood tests, which are the standard for diagnosing allergies. Never use genetic information to make decisions about your diet or to self-diagnose. If you have questions about your health or potential sensitivities, always discuss them with a medical professional who can provide personalized guidance based on your clinical history.
How common is this variant?
The minor allele frequency for this variant is approximately 0.38 in European populations and 0.24 in East Asian populations.
Frequently asked questions
Can a DNA test tell me if I have a peanut allergy?
No, a DNA test cannot diagnose a peanut allergy. Allergies are complex conditions diagnosed by healthcare professionals through clinical testing, such as skin or blood tests, which measure your immune system's actual response to allergens.
What does 'limited evidence' mean in genetics?
Limited evidence means that while some studies have observed a statistical link between a variant and a trait, the findings are not yet strong or consistent enough to be used for clinical prediction. More research is typically needed to confirm the biological impact.
Is rs9271700 the only gene involved in peanut allergy?
No, peanut allergy is a complex trait influenced by many different genes, as well as environmental factors. The HLA region is just one area of the genome that has been associated with immune-related conditions.
Should I change my diet based on my rs9271700 genotype?
You should never change your diet based on a genetic report. If you have concerns about food allergies, please consult with a doctor or a registered dietitian before making any changes to your eating habits.
Sources & further reading
Educational information only, last refreshed 10/10/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs9271700?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in HLA-DQA1
MHC class II regulatory variant linked to aeroallergen sensitization and peanut allergy susceptibility.
Tagging SNP strongly linked to the HLA-DQ2.5 heterodimer which predisposes carriers to celiac disease.
Variant in the HLA class II region strongly associated with risk of celiac disease, type 1 diabetes, and autoimmune thyroiditis.
Variant in the HLA-DQA1/DRB1 locus associated with peanut and tree nut allergy susceptibility.
Major histocompatibility complex class II variant associated with peanut allergy susceptibility and anaphylaxis risk, with evidence varying by ancestral background.
Intergenic HLA class II polymorphism associated with IgE-mediated food allergy to tree nuts and peanuts.