IL6 rs1800625: What Your Genotype Means
The rs1800625 variant is a single nucleotide polymorphism located in the promoter region of the IL6 gene. It is studied for its potential influence on baseline systemic inflammatory levels and its association with cardiovascular disease risk.
What each genotype means
Baseline inflammatory profile
This is the most common genotype for this variant. Research suggests that individuals with this genotype may have different baseline systemic inflammatory tone compared to those carrying the C allele, though the clinical significance of this difference remains a subject of ongoing study.
This is the major homozygous genotype in most global populations.
Intermediate inflammatory profile
Carrying one copy of the C allele has been investigated for its potential association with inflammatory responses and cardiovascular health. Some studies have observed associations between this variant and the incidence or severity of coronary heart disease, particularly in specific clinical contexts like diabetes, but evidence remains limited and mixed across different ancestries.
The C allele is a minor allele with a frequency of approximately 0.05 to 0.10 in European populations and is found at higher frequencies in East Asian populations.
Elevated inflammatory risk profile
Individuals with this genotype carry two copies of the minor C allele. Some research has linked this specific promoter polymorphism to variations in systemic inflammatory markers and potential associations with cardiovascular outcomes, such as brain infarcts in certain populations. Because these associations are based on observational studies, they should not be used to predict individual health outcomes.
This is the least common genotype, occurring at a frequency consistent with the lower prevalence of the C allele in most populations.
Understanding the rs1800625 Variant
The rs1800625 variant is a specific genetic change, often referred to as a -572G>C polymorphism, situated within the promoter region of the IL6 gene. A promoter region acts as a control switch for a gene, determining how much of a protein is produced by the cell. By altering this regulatory sequence, the rs1800625 variant may influence the transcriptional activity of the IL6 gene. Because this site is located in a regulatory area rather than the protein-coding sequence itself, it does not change the structure of the IL-6 protein, but rather the quantity or timing of its expression. Researchers track this SNP to understand how subtle variations in gene regulation contribute to individual differences in inflammatory responses and long-term health outcomes.
The Role of the IL6 Gene
The IL6 gene provides instructions for creating interleukin-6, a multifunctional cytokine that plays a central role in the human immune system. Interleukin-6 acts as both a pro-inflammatory cytokine and an anti-inflammatory myokine, helping the body respond to infections, tissue damage, and physical stress. It is a key messenger that triggers the liver to produce acute-phase proteins, which are essential for the body's immediate defense mechanisms. Because of its central role in inflammation, the IL6 gene is a frequent subject of study in conditions where immune regulation is critical, such as chronic inflammatory diseases and cardiovascular health. Understanding how IL6 expression is modulated by genetic variants like rs1800625 helps scientists map the complex pathways that link immune system activity to systemic health.
Research and Evidence Strength
The association between rs1800625 and health outcomes is currently considered to have limited evidence strength. While some studies have explored its role in baseline systemic inflammatory tone and cardiovascular disease risk, results across different populations have been mixed. Recent large-scale genetic research has highlighted that while IL-6 signaling pathways are causally involved in atherosclerotic cardiovascular disease, the specific impact of individual promoter variants like rs1800625 remains a subject of ongoing investigation. It is important to note that genetic associations are statistical in nature and do not imply a direct cause-and-effect relationship for any single individual. Because the evidence is not definitive, this variant is not currently used in clinical settings to predict disease risk or guide medical treatment.
Population Frequency
The frequency of the rs1800625 variant varies significantly across different ancestral groups. In European populations, the minor allele frequency is typically observed between 0.05 and 0.10. The variant is generally found at higher frequencies in East Asian populations. These differences highlight the importance of considering ancestry when interpreting genetic data, as the prevalence of specific alleles can change the statistical context of a variant's potential impact. Researchers use these frequency data to ensure that genetic studies are representative of diverse populations, which is essential for understanding the global landscape of human genetic variation and its potential influence on health.
Interpreting Your Genetic Information
If you have received information about your rs1800625 genotype, it is important to view it as a small piece of a much larger biological puzzle. Genetic variants are only one factor among many, including lifestyle, environment, and other genetic markers, that influence health. You cannot use this information to diagnose a condition or predict your future health status. If you are concerned about cardiovascular health or inflammatory markers, the most effective approach is to consult with a healthcare professional who can evaluate your overall health profile, including blood tests and clinical history. Never make changes to your diet, exercise, or medication based on a single genetic variant. Always discuss any health-related questions or concerns with your doctor or a qualified genetic counselor.
How common is this variant?
The minor allele frequency for rs1800625 is approximately 0.05-0.10 in European populations and is observed at higher frequencies in East Asian populations.
Frequently asked questions
What does the rs1800625 variant do?
The rs1800625 variant is a change in the promoter region of the IL6 gene. It is thought to potentially influence how much interleukin-6 protein the body produces in response to signals.
Is rs1800625 linked to heart disease?
Research has investigated the role of IL6 in cardiovascular health, but the specific evidence linking the rs1800625 variant to heart disease risk is currently limited and mixed. It is not considered a definitive predictor of cardiovascular outcomes.
Should I be worried if I have the CC genotype?
No, you should not be worried. Genetic variants like rs1800625 are common and represent normal human variation. They do not act as a diagnosis and should be discussed with a doctor in the context of your overall health.
Can I change my IL6 expression through diet?
While lifestyle factors like diet and exercise influence systemic inflammation, there is no evidence that you can specifically target or change the expression of the IL6 gene based on your rs1800625 genotype. Focus on general healthy habits and consult your physician for personalized health advice.
Sources & further reading
Educational information only, last refreshed 9/27/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Promoter variant (-572 C/G) in interleukin-6 affecting baseline systemic inflammation and cardiovascular risk biomarkers.
This variant is associated with variations in C-reactive protein levels, a key marker of systemic inflammation.
This variant shows a borderline association with late-life survival in European cohorts.
A promoter variant in the Interleukin-6 gene that influences systemic inflammation levels (C-Reactive Protein).