IL2RA rs3118470: Understanding Your Genetic Variant
The rs3118470 variant is a single nucleotide polymorphism located within the IL2RA gene. Research has identified this specific genetic marker as being associated with an increased susceptibility to Type 1 Diabetes.
What each genotype means
Baseline risk profile
This genotype represents the homozygous state for the major allele. Research indicates that individuals with this genotype do not carry the specific allele associated with increased susceptibility to Type 1 Diabetes in this context.
This is the most common genotype, found in the majority of the global population.
Slightly increased risk profile
This heterozygous genotype is associated with a modest increase in susceptibility to Type 1 Diabetes compared to the CC genotype. Statistical associations suggest an odds ratio of approximately 1.28 for the risk allele, though this evidence is considered limited and may vary by ancestry.
This genotype is common, appearing in a significant portion of the population across various ancestries.
Increased risk profile
This homozygous genotype is associated with an increased susceptibility to Type 1 Diabetes. While this variant is linked to immune system regulation via the IL2RA gene, this association is based on limited evidence and should not be interpreted as a diagnostic indicator of disease.
This genotype is less common than the CC or CT genotypes, with a minor allele frequency of approximately 0.3186.
What is rs3118470?
The variant rs3118470 is a single nucleotide polymorphism (SNP) located on chromosome 10. In the context of human genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is situated within the IL2RA gene, which provides instructions for making a protein that is a critical component of the interleukin-2 receptor. This receptor is found on the surface of certain immune cells, including T cells, which play a vital role in the body's immune response. By studying variations like rs3118470, researchers aim to understand how subtle differences in our genetic code might influence the function of immune pathways and contribute to the development of complex, multifactorial conditions.
The Role of the IL2RA Gene
The IL2RA gene encodes the alpha chain of the interleukin-2 receptor, also known as CD25. This protein is essential for the proper signaling of interleukin-2, a molecule that helps regulate the activity of white blood cells. Specifically, the IL-2 receptor is crucial for the development and maintenance of regulatory T cells, which act as the 'brakes' of the immune system, preventing it from attacking the body's own tissues. When the IL2RA gene functions optimally, it helps maintain immune balance. However, variations in this gene can potentially alter the expression or function of the receptor, which may impact how the immune system recognizes and responds to internal and external threats. Because of its central role in immune regulation, the IL2RA locus is frequently studied in the context of various autoimmune and inflammatory conditions.
Research and Evidence Strength
Scientific literature has investigated the association between rs3118470 and Type 1 Diabetes (T1D). Some studies have suggested that the presence of the C allele at this position is linked to a modest increase in susceptibility to T1D, with some reports citing an odds ratio of approximately 1.28. It is important to note that the evidence strength for this association is considered limited. Type 1 Diabetes is a complex, polygenic disease, meaning it is influenced by the interaction of many different genetic variants, as well as environmental factors. While rs3118470 is a marker of interest in the scientific community, it is not a diagnostic tool. The presence of this variant does not guarantee the development of any condition, and many individuals without this variant may still develop the disease, while many with it will not.
Population Frequency
The frequency of genetic variants can vary significantly across different ancestral populations. For rs3118470, the Global Minor Allele Frequency (GMAF) is approximately 0.3186. This indicates that the variant is relatively common in the general population. Because this frequency is an average across diverse groups, the actual prevalence of the C and T alleles may differ depending on an individual's specific genetic ancestry. Understanding these population-level statistics is a fundamental part of genomic research, as it helps scientists determine whether a variant is rare or common and how its distribution might correlate with disease patterns observed in different parts of the world.
What You Can Do With This Information
Information about genetic variants like rs3118470 is primarily intended for educational and research purposes. It is crucial to understand that this variant is not a medical diagnosis and cannot predict your personal health outcomes. Because Type 1 Diabetes is influenced by a wide array of genetic and environmental factors, a single SNP provides only a very small piece of a much larger puzzle. You cannot use this information to make medical decisions, change your lifestyle, or alter any prescribed treatments. If you have concerns about your health, your family history of autoimmune conditions, or your risk for diabetes, the most appropriate step is to consult with a qualified healthcare professional. They can provide personalized guidance based on your clinical history, physical examinations, and validated diagnostic testing.
How common is this variant?
The GMAF for rs3118470 is 0.3186, indicating that the variant is common across many global populations.
Frequently asked questions
Does having the rs3118470 variant mean I will get diabetes?
No. This variant is only one of many factors that contribute to the risk of developing Type 1 Diabetes. Having the variant does not mean you will develop the condition, and it is not a diagnostic test.
Is rs3118470 a diagnostic test for Type 1 Diabetes?
No, it is not. Type 1 Diabetes is diagnosed by healthcare providers using clinical criteria such as blood glucose levels and antibody testing, not by looking at a single genetic variant.
Can I change my risk associated with this variant?
Genetic variants are inherited and cannot be changed. However, you can always focus on general health and wellness, and you should discuss any specific health concerns or family history with your doctor.
Where can I find more information about IL2RA?
You can find reliable information about the IL2RA gene and its functions on resources like MedlinePlus Genetics or the National Center for Biotechnology Information (NCBI) Gene database.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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