IL23R rs11209032: What Your Genotype Means
The rs11209032 variant is a genetic marker located within the IL23R gene, which plays a critical role in the body's inflammatory response. Research has identified this variant as being associated with a decreased risk of developing certain chronic inflammatory conditions, such as Crohn's disease.
What each genotype means
Typical inflammatory risk profile
You carry two copies of the common G allele, which is associated with typical baseline susceptibility to autoimmune conditions such as Crohn's disease, ulcerative colitis, and ankylosing spondylitis. This genotype does not confer the protective effect observed with the minor variant, reflecting standard average population risk. Having this genotype does not mean you will develop an inflammatory disease, as lifestyle and numerous other genetic factors contribute.
Carried by approximately 86% of individuals of European descent and nearly 100% of individuals of East Asian and African ancestries.
Reduced autoimmune susceptibility
You carry one copy of the protective A allele (p.Arg381Gln), which significantly reduces IL-23 receptor signaling through the STAT3/STAT4 pathway. Population studies link this single protective allele to a substantially reduced risk of developing Crohn's disease, ulcerative colitis, and ankylosing spondylitis. While protective, it does not guarantee complete immunity against these conditions.
Found in approximately 12% to 14% of people of European ancestry, but it is rare or virtually absent in African and Asian populations.
Strongly reduced autoimmune susceptibility
You carry two copies of the protective A allele, which is linked to diminished pro-inflammatory IL-23 receptor signaling. Epidemiological research associates this genotype with strong protection against Crohn's disease, ulcerative colitis, and ankylosing spondylitis compared to the common genotype. However, overall disease predisposition is polygenic and environmental, so individual health outcomes cannot be determined by this variant alone.
Present in fewer than 1% of individuals of European descent and extremely rare or absent in other global populations.
Understanding the rs11209032 Variant
The rs11209032 variant is a single nucleotide polymorphism (SNP) found within the IL23R gene, which is located on chromosome 1. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is often studied alongside other markers in the same gene, such as the well-known p.Arg381Gln (rs11209026) mutation. While rs11209032 is not the coding change itself, it serves as a significant marker in genomic studies investigating how variations in the IL23R gene influence immune system regulation. Scientists track these markers to understand how subtle differences in our genetic code can contribute to the complex architecture of human health and disease susceptibility.
The Role of the IL23R Gene
The IL23R gene provides instructions for creating the interleukin-23 receptor protein. This receptor is a vital component of the immune system, specifically involved in the signaling pathways that trigger inflammation. By binding to the cytokine interleukin-23, the receptor helps activate certain types of T-cells, which are essential for defending the body against pathogens. However, when this pathway is overactive, it can contribute to chronic inflammation. Research suggests that variations in this gene may alter the receptor's function or expression levels, potentially modulating the intensity of the immune response. Because of its central role in inflammatory signaling, the IL23R gene is a primary focus for researchers studying autoimmune and inflammatory conditions.
Research and Clinical Associations
Scientific literature has established a statistical association between variants in the IL23R gene and a reduced risk of inflammatory bowel diseases, including Crohn's disease and ulcerative colitis. The rs11209032 variant is frequently cited in genome-wide association studies (GWAS) as a marker linked to these protective effects. While the evidence is strong regarding the statistical correlation, the functional impact of this specific SNP is considered to have limited evidence compared to the direct coding variant p.Arg381Gln. It is important to note that these findings are based on population-level data and do not predict an individual's health outcome. The association is complex, and many other genetic and environmental factors contribute to the development of inflammatory conditions.
Population Frequency and Ancestry
The frequency of the rs11209032 variant varies significantly across different global populations. In European populations, the minor allele frequency (MAF) is approximately 0.07, meaning it is present but not the most common version of the gene. Conversely, this variant is reported to be rare in populations of African and Asian ancestry. These differences highlight the importance of considering genetic background when interpreting research findings. Because most large-scale studies on this variant have been conducted in European cohorts, the applicability of these findings to other ancestral groups remains an area of ongoing investigation. Understanding these frequency differences is crucial for the equitable development of future genomic medicine.
Interpreting Your Genetic Information
Information about your genotype for rs11209032 should be viewed as a piece of a much larger biological puzzle. While research indicates that certain genotypes are associated with a lower risk of specific inflammatory diseases, this does not constitute a medical diagnosis or a guarantee of health. Genetics is only one factor; lifestyle, environment, and other genetic markers also play significant roles in disease risk. If you are concerned about your risk for inflammatory conditions or have questions about your genetic results, it is essential to discuss them with a qualified healthcare provider or a genetic counselor. They can help you interpret these findings in the context of your personal and family medical history.
How common is this variant?
The rs11209032 variant has a minor allele frequency of approximately 0.07 in European populations and is considered rare in African and Asian ancestries.
Frequently asked questions
Does having the protective genotype mean I will never get Crohn's disease?
No. Genetic associations are based on statistical trends across large populations and do not determine individual health outcomes. Many factors, including environment and other genes, influence the risk of developing Crohn's disease.
Is rs11209032 the same as the p.Arg381Gln variant?
No, they are different. While both are located in the IL23R gene and are often studied together, p.Arg381Gln is a coding variant that changes the protein structure, whereas rs11209032 is a marker often used in association studies.
Should I change my diet based on this genetic result?
You should not make changes to your diet or health regimen based solely on a genetic variant. Always consult with a healthcare professional or a registered dietitian before making significant changes to your health plan.
Where can I find more information about my specific genotype?
You can discuss your genetic report with a certified genetic counselor or your primary care physician. They can provide context based on your personal health history and the latest clinical research.
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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Missense variant (p.Arg381Gln) strongly protective against inflammatory bowel disease including Crohn's disease and ulcerative colitis.
Associated with susceptibility to inflammatory bowel disease, including Crohn disease and ulcerative colitis.
Intronic regulatory SNP in IL23R modulating Th17 responses and susceptibility to Crohn's disease.