STAT6 rs324011: What Your Genotype Means
The rs324011 variant is a widely studied non-coding single nucleotide polymorphism located in the second intron of the STAT6 gene. Scientific studies have linked this variant to altered immune gene regulation, resulting in modest shifts in circulating total immunoglobulin E (IgE) levels and susceptibility to allergic conditions such as asthma and allergic rhinitis. However, its overall effect size is modest, and carrying risk-associated alleles does not guarantee the development of allergic disease.
What each genotype means
Baseline STAT6 activity
This genotype represents the wild-type configuration for this variant. Research indicates that individuals with this genotype do not carry the specific T-allele associated with increased STAT6 promoter activity and elevated IgE levels.
This is the most common genotype in many populations, though frequency varies significantly by ancestry.
Increased STAT6 expression potential
Carrying one copy of the T-allele has been associated in some studies with increased STAT6 promoter activity and higher serum total IgE levels. This variant may influence immune responses related to allergic rhinitis and asthma, though individual clinical outcomes are complex and multifactorial.
This heterozygous genotype is common, appearing in a significant portion of the population across various ancestries.
Elevated STAT6 expression potential
Individuals with this genotype carry two copies of the T-allele, which has been shown in laboratory studies to increase STAT6 promoter activity and mRNA expression. This genetic profile is statistically associated with higher serum total IgE levels and may correlate with an increased risk for allergic conditions, though it is not a diagnostic indicator of disease.
This genotype is less common than the heterozygous state but is present at notable frequencies in many global populations.
Genomic Location and the STAT6 Gene
The single nucleotide polymorphism rs324011, historically referenced as C2892T, is situated on chromosome 12 within the second intron of the STAT6 (Signal Transducer and Activator of Transcription 6) gene. STAT6 encodes a critical transcription factor that operates downstream of interleukin-4 (IL-4) and interleukin-13 (IL-13) cytokine receptor signaling. These signaling cascades are foundational to Type 2 immune responses, guiding the differentiation of helper T cells (Th2) and directing B cells to switch antibody production toward immunoglobulin E (IgE). Because introns often contain non-coding regulatory sequences, variants like rs324011 can modulate how robustly nearby genes are transcribed without changing the amino acid sequence of the final protein product.
Biological Mechanism: Transcriptional Tuning
Functional investigations, notably by Schedel and colleagues in the Journal of Allergy and Clinical Immunology, demonstrate that intron 2 of STAT6 typically acts as a repressive or silencer element. Molecular experiments show that the alternate T allele introduces a functional binding motif for the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) transcription factor family. The presence of this binding motif enhances promoter activity in laboratory cell assays and associates with increased STAT6 messenger RNA expression ex vivo. By elevating STAT6 expression during immune activation, this allele appears to slightly facilitate the downstream signaling cascade that drives elevated IgE synthesis and atopic reactivity in lymphoid cells.
Clinical and Research Findings
Multiple candidate gene and cohort studies have evaluated rs324011 in relation to atopic phenotypes, including allergic asthma, atopic dermatitis, and elevated baseline total serum IgE. Several studies in European, Middle Eastern, and Asian cohorts have documented statistical associations between the T allele—particularly in homozygous TT carriers under recessive models—and higher circulating IgE or increased odds of atopic asthma. Nevertheless, findings remain complex and heterogeneous across literature. Some genome-wide scans and population-specific studies in diverse European and Asian populations failed to detect statistically significant associations with asthma diagnosis itself, highlighting that the variant functions as a modest susceptibility modifier rather than a primary diagnostic determinant.
Understanding Ancestry and Population Patterns
The frequency of rs324011 alleles varies meaningfully across continental populations. According to population genetics reference datasets like the 1000 Genomes Project and gnomAD, the minor allele frequency (T allele) hovers around 20% to 35% in European and Middle Eastern cohorts, while reaching higher frequencies approaching 40% to 50% in East Asian populations. Genotype proportions follow Hardy-Weinberg equilibrium across most studied cohorts. Because allergic traits are polygenic and influenced by hundreds of common variants alongside heavy environmental exposures, the impact of rs324011 can appear stronger or weaker depending on the specific genetic background and environmental allergen exposures of each group.
What This Means for You
It is essential to understand that rs324011 is not a clinical test for allergic diseases or immune disorders. Possessing one or two copies of the T allele does not diagnose asthma, allergic rhinitis, or atopic dermatitis, nor does having the CC genotype make someone immune to allergies. Allergic conditions develop through intricate interactions between many genetic loci, air quality, childhood exposures, and personal health factors. If you experience chronic respiratory issues, seasonal allergies, or skin inflammation, your genetic test results should never replace formal clinical evaluation, allergen skin-prick testing, or consultation with a qualified allergist or medical provider.
How common is this variant?
The minor allele (T) frequency is typically observed between 0.20 and 0.35 in European and Middle Eastern populations, while rising to approximately 0.40 to 0.50 in East Asian ancestries.
Frequently asked questions
Does having the TT genotype mean I will definitely get asthma?
No. The rs324011 variant is merely a statistical risk factor with a modest individual effect. Many individuals with the TT genotype never develop asthma, while many people without it do, because asthma is shaped by complex gene-environment interactions.
Can this genetic test measure my IgE levels?
No, a genotype test only reveals your inherited DNA code, not your active immune status. Actual circulating IgE levels fluctuate based on exposure to allergens, infections, and lifestyle, and can only be measured through a clinical laboratory blood test.
Why do some studies show an association with allergies while others do not?
Genetic studies of common variants often yield mixed results due to differences in sample size, participant ancestry, age groups, and environmental exposure to specific allergens. These discrepancies illustrate that rs324011 is one small piece of a much larger immunological puzzle.
Should I change my allergy medications based on this result?
No. You should never alter or stop any prescribed medical treatments based on direct-to-consumer genetic information. Always discuss persistent allergic symptoms or medication changes with your physician or an allergist.
Sources & further reading
Educational information only, last refreshed 9/8/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Intronic variant in STAT6 associated with elevated serum IgE levels and food allergy susceptibility.
STAT6 intronic variant modulating IL-4/IL-13 signaling and associated with atopic dermatitis and asthma risk.
Intronic regulatory polymorphism in STAT6 associated with elevated serum IgE levels and mucosal allergic reactivity.
Non-coding variant in the key Th2 signaling transducer STAT6, frequently linked to elevated serum IgE levels and allergic rhinitis risk.
This variant is linked to the clinical phenotype of eosinophilic esophagitis, reflecting the role of immune regulation in the disease.