TSLP rs2287987: Understanding Your Genetic Variant
The rs2287987 variant is a single nucleotide polymorphism located within the TSLP gene, which encodes a cytokine critical for immune system regulation. This variant is associated with variations in circulating TSLP levels and a potential predisposition to eosinophilic inflammation.
What each genotype means
Baseline TSLP activity
This genotype represents the baseline configuration often used for comparison in genetic studies. Current evidence suggests that individuals with this genotype do not carry the specific allele associated with heightened TSLP-driven inflammation at this locus.
This is the most common genotype in populations where the minor allele frequency is approximately 0.30.
Moderate TSLP activity
Research indicates this genotype is associated with a statistical increase in circulating TSLP compared to the CC genotype. As TSLP acts as a regulator of allergic and eosinophilic inflammation, carrying this genotype may contribute to an individual's unique predisposition to such immune responses; however, this association is considered limited and may vary based on other genetic and environmental factors.
Carried by a significant portion of individuals of European and South Asian ancestry, consistent with a minor allele frequency of approximately 0.30.
Elevated TSLP activity
This genotype is associated with the highest observed levels of circulating TSLP for this variant, which may correlate with a heightened predisposition to eosinophilic inflammation in some populations. Because the evidence linking this specific variant to clinical outcomes is limited and often ancestry-specific, this profile should be viewed as a contributing factor rather than a definitive predictor of health outcomes.
This genotype is the least common of the three in populations with a minor allele frequency of approximately 0.30.
What is rs2287987?
The rs2287987 variant is a specific change in the DNA sequence of the TSLP gene, which is located on chromosome 5. In genetics, a single nucleotide polymorphism (SNP) like rs2287987 represents a variation at a single position in the genome where one nucleotide is replaced by another. This particular variant is found within the regulatory or coding regions of the TSLP gene, which provides instructions for producing the thymic stromal lymphopoietin protein. Because this SNP is located in a region that influences gene expression, researchers study it to understand how subtle differences in our genetic code can lead to differences in how our immune systems respond to environmental triggers. It is important to note that having a specific genotype at this location does not mean an individual will develop a specific condition, but rather that it may contribute to the biological landscape of an individual's immune profile.
The Role of the TSLP Gene
The TSLP gene encodes thymic stromal lymphopoietin, a cytokine that acts as a master switch in the initiation of allergic inflammation. TSLP is primarily produced by epithelial cells—the cells that line the surfaces of our body, such as the skin, gut, and airways. When these cells are exposed to allergens, pathogens, or mechanical stress, they release TSLP, which then signals to dendritic cells and other immune cells to trigger a T-helper type 2 (Th2) immune response. This pathway is essential for defending the body against certain parasites, but when overactive, it is a key driver of allergic diseases like asthma, atopic dermatitis, and other eosinophilic inflammatory conditions. By regulating the maturation and activation of immune cells, TSLP helps coordinate the body's inflammatory response, making it a significant focus for researchers studying immune-mediated disorders.
Research and Evidence Strength
Current research into rs2287987 suggests an association with elevated circulating levels of TSLP and a heightened predisposition to eosinophilic inflammation. However, the evidence strength for this specific variant remains limited. While some studies indicate that genetic variation in the TSLP locus can influence the expression of the TSLP protein, the clinical impact of these variations is complex and often depends on the interaction between genetics and environmental factors. Many studies have shown that the risk of developing conditions like asthma is not determined by a single SNP alone, but rather by the combined effects of multiple genetic variants and the individual's exposure to allergens. Because findings can be inconsistent across different cohorts and populations, the scientific community views these associations as indicators of biological pathways rather than definitive diagnostic markers for disease.
Population Frequency
The rs2287987 variant is relatively common, with a minor allele frequency (MAF) of approximately 0.30 in European and South Asian populations. This means that a significant portion of the population carries at least one copy of the variant allele. Because the frequency is high, it is considered a common genetic variation rather than a rare mutation. Understanding the distribution of this SNP across different ancestral groups is an ongoing area of study, as genetic background can influence how specific variants interact with other genes and environmental factors. The prevalence of this variant highlights that it is a normal part of human genetic diversity, even if it is associated with specific immune-related traits in some individuals.
What You Can Do With This Information
Information about your genotype for rs2287987 is for educational purposes only and should not be used to diagnose or treat any medical condition. Genetic variants are only one piece of a much larger puzzle that includes your environment, lifestyle, and overall health history. If you are concerned about symptoms related to allergies, asthma, or inflammation, it is essential to consult with a healthcare professional or an allergist. They can provide a comprehensive evaluation that considers your clinical symptoms rather than relying on genetic data alone. If you are currently taking medications for inflammatory conditions, do not make any changes to your treatment plan based on genetic information without first discussing it with your clinician or pharmacist. They are the best resources for understanding how your unique health profile influences your care.
How common is this variant?
The rs2287987 variant has a minor allele frequency of approximately 0.30 in European and South Asian cohorts, making it a common genetic variation.
Frequently asked questions
Does having the rs2287987 variant mean I have asthma?
No. Genetic variants like rs2287987 are associated with a predisposition to certain immune responses, but they do not cause asthma on their own. Asthma is a complex condition influenced by many genes and environmental factors.
Can I use this SNP to predict my risk of allergies?
Current evidence is limited and not sufficient for clinical prediction. While the variant is linked to TSLP pathways, it cannot be used as a standalone test to predict whether you will develop allergies.
Should I change my medication based on my TSLP genotype?
No. You should never change your medication or dosing based on genetic information without consulting your doctor or pharmacist. Always follow the treatment plan prescribed by your healthcare provider.
Where can I find more information about TSLP?
You can find reliable information about the TSLP gene and its functions on resources like MedlinePlus Genetics or the NCBI Gene database. These sites provide comprehensive, peer-reviewed summaries of human genes.
Sources & further reading
Educational information only, last refreshed 9/15/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A promoter variant regulating thymic stromal lymphopoietin expression, thereby controlling dendritic cell priming and eosinophilic allergic responses.
Upstream variant of thymic stromal lymphopoietin linked to elevated eosinophil activation and susceptibility to allergic disease.
An upstream promoter variant that alters thymic stromal lymphopoietin expression, mediating susceptibility to allergic rhinitis and childhood asthma.
A well-characterized intergenic polymorphism upstream of TSLP conferring increased risk of eczema-associated food allergy and allergic eosinophilic airway disease.
Upstream variant that alters thymic stromal lymphopoietin expression, increasing susceptibility to eosinophilic inflammation and food allergy.
Intergenic/promoter region SNP upstream of TSLP that strongly associates with eosinophilic esophagitis, asthma, atopic dermatitis, and allergic sensitization phenotypes.