IL13 rs1800925: Understanding This Genetic Variant and Allergy Risk
The rs1800925 variant is a single nucleotide polymorphism located within the IL13 gene, which plays a central role in the immune system's inflammatory response. Research has associated this variant with an increased risk of developing allergic conditions, including asthma and allergic rhinitis, across various populations.
What each genotype means
Typical IL13 expression
This is the most common genotype for this variant. Research suggests this version of the IL13 gene is associated with baseline cytokine signaling levels, though individual risk for asthma or atopy is influenced by many other genetic and environmental factors.
This is the major homozygous genotype found in the majority of individuals across most global populations.
Increased Th2 cell activity
Carriers of this genotype have been observed in some studies to have increased Th2 cell counts and a higher risk of fixed airflow obstruction. Because this variant is linked to immune-mediated inflammatory pathways, you should discuss any respiratory symptoms or concerns with your clinician.
This heterozygous genotype is found at varying frequencies depending on ancestry, appearing in a significant portion of the population.
Elevated asthma-related risk
This genotype has been associated with an increased risk of asthma and atopic phenotypes in several studies. Research indicates it may contribute to persistent blood eosinophilia and altered cytokine signaling, though it does not guarantee the development of any specific condition.
This is the minor homozygous genotype and is generally less common than the CC or CT genotypes in most studied populations.
What is rs1800925?
The rs1800925 variant is a specific change in the DNA sequence of the IL13 gene. In genetics, a single nucleotide polymorphism (SNP) like rs1800925 represents a variation at a single position in the genome. This particular SNP is often studied for its potential to influence how the body produces or regulates Interleukin-13 (IL-13), a protein that acts as a signaling molecule. Because this variant is located in a region of the gene that can influence protein function or expression levels, scientists have focused on it to understand why some individuals may be more susceptible to inflammatory responses than others. It is important to note that while this variant is a marker of interest, it is just one of many genetic and environmental factors that contribute to the complex development of allergic diseases.
The Role of the IL13 Gene
The IL13 gene provides instructions for making the Interleukin-13 protein, which is a key cytokine involved in the immune system. Cytokines are signaling proteins that help cells communicate, particularly during an immune response. IL-13 is specifically known for its role in promoting inflammation and is a major mediator in allergic asthma and other atopic conditions. It functions by binding to a receptor complex on the surface of various cells, triggering a cascade of signals that lead to allergic symptoms. When the IL13 gene contains variations, it may alter the activity or the amount of IL-13 produced. Research suggests that certain variants can lead to enhanced signaling activity, which may lower the threshold for the immune system to react to allergens, potentially contributing to the airway hyperresponsiveness often seen in asthma.
Research and Evidence Strength
The evidence linking rs1800925 to allergic conditions is considered moderate. Numerous studies have investigated this SNP, with many reporting a significant association with asthma and allergic rhinitis. For instance, meta-analyses have provided evidence that this variant acts as a risk factor for allergic asthma, particularly in Asian populations. Other studies have observed associations with rhinitis in specific cohorts. However, the results across different studies have been somewhat conflicting, which is common in genetic research on complex diseases. Factors such as ancestry, environmental exposures, and interactions with other genes—such as those encoding the IL-4 receptor—can influence the findings. Because of these variables, the association is not universal, and the variant does not act as a standalone cause of disease but rather as a contributing factor within a broader genetic and environmental context.
What You Can Do With This Information
Understanding your genetic profile regarding rs1800925 can be an interesting way to learn about your biological predispositions, but it should not be used for medical diagnosis or to make health decisions on your own. Genetic variants are only one piece of a very large puzzle that includes your environment, lifestyle, and other genetic factors. If you are concerned about asthma, allergies, or other respiratory symptoms, the most effective approach is to consult with a healthcare professional, such as an allergist or a pulmonologist. They can evaluate your clinical history, perform necessary diagnostic tests, and provide personalized guidance. Never change your medication or treatment plan based on genetic information without first discussing it with your clinician or pharmacist, as they are best equipped to interpret how your unique profile fits into your overall health management.
How common is this variant?
The frequency of the rs1800925 variant varies significantly across different global populations. Specific frequency data is not uniformly recorded in all databases, but studies indicate that the distribution of the T and C alleles differs by ancestry, which may contribute to the varying strength of associations observed in different ethnic groups.
Frequently asked questions
Does having the rs1800925 variant mean I will develop asthma?
No, having this variant does not mean you will develop asthma. Asthma is a complex condition influenced by many genes and environmental factors, and this variant is only one small contributing factor.
Can I use a DNA test to diagnose my allergies?
No, genetic tests for variants like rs1800925 are not diagnostic tools for allergies. Allergies are diagnosed by healthcare providers through clinical evaluations, skin prick tests, or blood tests.
Is rs1800925 the same as the R110Q variant?
Yes, rs1800925 is often referred to in scientific literature as the R110Q variant. This refers to a specific amino acid change in the IL-13 protein that can result from this genetic variation.
Should I change my allergy medication based on my genotype?
You should never change your medication based on genetic results. Always consult with your doctor or pharmacist before making any changes to your prescribed treatment plan.
Sources & further reading
Educational information only, last refreshed 10/6/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A well-studied coding missense variant (Arg130Gln) in IL13 that increases receptor affinity, predisposing individuals to elevated IgE levels and atopic reactions.
Located near the IL13 locus, this non-coding variant modulates cytokine production and is associated with allergic rhinitis, atopic asthma, and elevated total serum IgE.
Variant in the TERT gene (often misattributed to IL13 in older literature) associated with cancer risk across multiple populations.
IL13 variant associated with elevated IgE and allergic/atopic tendencies.