IL6R rs2228145: What Your Genotype Means
The rs2228145 variant is a common genetic change in the IL6R gene that alters how the body processes the interleukin-6 receptor. Research suggests this variant influences inflammatory pathways and is associated with a reduced risk of coronary heart disease.
What each genotype means
Standard IL-6 receptor signaling
This genotype represents the major allele pair, which is associated with standard levels of membrane-bound IL-6 receptor and typical classical IL-6 inflammatory signaling. Research indicates that individuals with this genotype do not receive the specific protective benefit against coronary heart disease associated with the minor allele.
This is the most common genotype globally, though its prevalence varies significantly by ancestry.
Reduced classical IL-6 signaling
This heterozygous genotype is associated with increased shedding of the IL-6 receptor, which leads to higher levels of soluble IL-6 receptor and dampened classical IL-6 inflammatory signaling. Studies suggest this profile confers a modest protective effect against coronary heart disease compared to the AA genotype.
This genotype is common, appearing in a significant portion of the population across most major ancestral groups.
Enhanced IL-6 receptor shedding
This homozygous genotype results in the highest levels of soluble IL-6 receptor and the most significant reduction in classical IL-6 inflammatory signaling. While this is associated with a reduced risk of coronary heart disease, some research has explored its potential role as a modifier in other conditions, such as asthma or disease progression in ALS; consult a clinician for context regarding specific health concerns.
This is the least common of the three genotypes, with frequencies typically ranging from approximately 8% to 20% depending on the population.
Understanding the rs2228145 Variant
The rs2228145 variant is a single nucleotide polymorphism (SNP) located within the IL6R gene, which provides instructions for making the interleukin-6 receptor. This specific change is a missense variant, meaning it results in a single amino acid substitution—specifically, replacing aspartic acid with alanine at position 358 (p.Asp358Ala). This change is functional, as it enhances the process of proteolytic shedding, where the receptor is cleaved from the cell surface. By increasing the amount of soluble receptor in the bloodstream, this variant effectively modulates how the body responds to interleukin-6, a key protein involved in inflammation. Because this process is central to immune regulation, scientists have studied this variant extensively to understand its role in chronic health conditions.
The Role of the IL6R Gene
The IL6R gene encodes the alpha subunit of the interleukin-6 receptor. Interleukin-6 (IL-6) is a cytokine, a signaling molecule that plays a critical role in the body's inflammatory response. Under normal conditions, IL-6 binds to its receptor on the surface of cells to trigger downstream signaling cascades that promote inflammation and the production of acute-phase reactants like C-reactive protein (CRP) and fibrinogen. By enhancing the shedding of the receptor, the rs2228145 variant reduces the density of receptors on the cell surface, which can dampen classical IL-6 inflammatory signaling. This mechanism is of significant interest to researchers because chronic, low-grade inflammation is a known contributor to the development of cardiovascular disease, making the IL6R pathway a potential target for therapeutic intervention.
Research and Cardiovascular Associations
Large-scale genetic studies and meta-analyses have consistently associated the rs2228145 variant with a protective effect against coronary heart disease. For every copy of the minor allele inherited, individuals have shown a modest reduction in the risk of developing coronary heart disease. This association is supported by Mendelian randomization studies, which use genetic variants to infer causal relationships between biomarkers and disease outcomes. While the variant is linked to lower levels of inflammatory markers like CRP and fibrinogen, it does not appear to significantly affect other traditional risk factors such as blood pressure, lipid concentrations, or body mass index. The evidence for this protective association is considered moderate to strong, as it has been replicated across diverse cohorts, confirming that the IL6R pathway is causally relevant to cardiovascular health.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs2228145 represent only one piece of a complex puzzle regarding heart health. While this variant is associated with a lower risk of coronary heart disease, it does not guarantee protection, nor does the absence of the protective allele mean an individual will necessarily develop heart disease. Cardiovascular health is influenced by a wide array of factors, including diet, physical activity, smoking status, and other genetic predispositions. This information is intended for educational purposes and should not be used to make medical decisions or to diagnose any condition. If you have concerns about your cardiovascular risk or are considering how your genetic profile might influence your health, please consult with a qualified healthcare provider or a genetic counselor who can provide personalized guidance based on your full clinical history.
How common is this variant?
The minor allele C is common globally, with a frequency of approximately 0.35–0.40 in European populations, 0.20–0.25 in East Asian populations, and 0.15–0.20 in African ancestries.
Frequently asked questions
Does having the rs2228145 variant mean I won't get heart disease?
No. While the variant is associated with a reduced risk of coronary heart disease, it is not a guarantee of protection. Many other lifestyle and genetic factors contribute to your overall cardiovascular health.
Should I change my medication based on this SNP?
You should never change your medication based on genetic information without consulting your doctor. Always discuss any concerns about your treatment plan with your clinician or pharmacist.
What is the difference between the A and C alleles?
The A allele is the major (common) allele, while the C allele is the minor (variant) allele. The C allele causes a change in the protein structure that leads to increased shedding of the IL-6 receptor from cell surfaces.
Is this variant used for clinical diagnosis?
No, this variant is not used for clinical diagnosis. It is primarily studied in research settings to understand the biological pathways involved in inflammation and cardiovascular disease.
Sources & further reading
Educational information only, last refreshed 9/21/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A functional missense variant (p.Asp358Ala) in the IL6R gene associated with increased levels of soluble IL-6 receptor and modulation of inflammatory responses.
Synonymous polymorphism in IL6R often studied in the context of inflammatory signaling; however, the primary functional variant in this gene is rs2228145 (Asp358Ala).
An intronic variant in the IL6R gene associated with systemic inflammatory signaling, reduced risk of certain cardiovascular conditions, and parental lifespan.
This SNP is associated with variations in C-reactive protein (CRP) levels and is considered a marker for systemic inflammation and cardiovascular risk.
This variant is associated with soluble IL-6 receptor levels and is linked to inflammatory markers and cardiovascular disease risk.
This variant is a functional polymorphism in the IL6R gene associated with altered levels of soluble interleukin-6 receptor and C-reactive protein, influencing inflammatory response.