IL6 rs1800796: What Your Genotype Means
The rs1800796 variant is a well-studied genetic polymorphism located in the promoter region of the IL6 gene, which plays a critical role in regulating inflammation. While occasionally miscataloged in older databases under other genes like MLH1, current genomic research links rs1800796 primarily to baseline interleukin-6 levels and altered risks for inflammatory and cardiovascular conditions.
What each genotype means
Typical mismatch repair profile
This genotype represents the homozygous state for the A allele at this position. Research into this specific variant has shown mixed results regarding its association with colorectal cancer risk, and it is not considered a primary driver of hereditary cancer syndromes. You should continue to follow standard population-based screening guidelines for colorectal health.
The frequency of this genotype varies by ancestry, but it is generally observed as a common variant in global populations.
Typical mismatch repair profile
This heterozygous genotype contains both the A and G alleles. Studies have not consistently linked this specific variant to a significant change in DNA mismatch repair efficiency or overall cancer risk in the general population. Please discuss any personal or family history of cancer with your healthcare provider to determine if standard screening is sufficient for your needs.
This genotype is found at moderate frequencies across many diverse ancestral groups.
Typical mismatch repair profile
This genotype represents the homozygous state for the G allele. Current scientific literature does not identify this variant as a significant independent risk factor for colorectal cancer. As with all individuals, maintaining a healthy lifestyle and adhering to recommended cancer screening schedules is the best approach to managing your long-term health.
This is a common genotype observed frequently across various global populations.
What is the rs1800796 Variant?
The rs1800796 single nucleotide polymorphism (SNP) is located on chromosome 7 within the promoter region of the IL6 gene. Specifically, it is often referred to in scientific literature as the -572G>C polymorphism, indicating a substitution of a guanine (G) for a cytosine (C) base near the start of the gene sequence. Because it sits in the promoter region—the control panel that dictates how actively a gene is turned on or off—this variant can influence how much of the gene's product is manufactured by the body. It is important to note that while some legacy catalog entries might mistakenly associate this rsID with the MLH1 gene and DNA mismatch repair, authoritative databases like dbSNP and ClinVar confirm its location in IL6. Understanding this variant provides insight into genetic predispositions related to immune function, though it is just one of many factors that determine overall health.
The Role of the IL6 Gene in the Body
The IL6 gene provides instructions for making interleukin-6, a powerful cytokine that acts as a major messenger in the immune system. Interleukin-6 is primarily responsible for regulating the body's inflammatory response, which is a natural and necessary defense mechanism against infection, injury, and disease. When the body detects a threat, IL-6 levels rise rapidly to stimulate immune cells and trigger acute inflammation. However, while short-term inflammation is protective, chronic or systemic inflammation is linked to a wide array of health issues, including cardiovascular disease, autoimmune disorders, and bone density loss. Genetic variants in the IL6 promoter, such as rs1800796, can subtly alter the baseline production of this cytokine or change how aggressively the body ramps up IL-6 during an immune challenge. Consequently, individuals with different genotypes may experience slight variations in their lifelong inflammatory burden.
Research and Statistical Associations
Scientific research has investigated rs1800796 for its potential links to various inflammation-driven conditions, though the evidence remains moderate and sometimes mixed. According to the GWAS Catalog and PubMed literature, the minor C allele has been statistically associated with an increased risk of abdominal aortic aneurysm (AAA) and certain cardiovascular traits, likely due to altered inflammatory pathways in blood vessels. Other studies have explored its connection to ischemic stroke, venous thromboembolism, and even bone health, with some evidence suggesting the variant influences osteoporosis risk. Additionally, research indicates that the G allele may be associated with different responses to chronic viral infections, such as hepatitis B. It is crucial to understand that these are statistical associations observed across large populations, not deterministic rules. The effect sizes are generally small, meaning that carrying a specific allele at rs1800796 does not guarantee the development of any of these conditions.
Population Frequency and Ancestry
The frequency of the rs1800796 alleles varies dramatically across different global populations, highlighting the importance of ancestry in genetic research. According to population databases like gnomAD and published literature, the C allele is highly prevalent in East Asian populations, where it appears in approximately 79 percent of individuals. It is also relatively common in South Asian (about 39 percent) and Admixed American (about 30 percent) populations. In stark contrast, the C allele is considered rare in individuals of African and European descent, appearing in only about 10 percent and 5 percent of these populations, respectively. This striking geographic distribution means that the predictive value and clinical relevance of this variant can differ significantly depending on a person's genetic background. Researchers must account for these ancestry-specific frequencies when designing studies to ensure that associations are genuinely linked to the variant rather than broader population structures.
What You Can Do With This Information
Discovering your rs1800796 genotype can be an interesting window into your genetic blueprint, but it is not a medical diagnosis. Because this variant only exerts a moderate influence on interleukin-6 levels and inflammation, it should be viewed as one small piece of a much larger health puzzle. You cannot use this information to predict whether you will definitely develop cardiovascular disease, osteoporosis, or any other condition. Instead, individuals concerned about inflammation or cardiovascular health should focus on modifiable lifestyle factors that have a much larger impact, such as maintaining a balanced diet, engaging in regular physical activity, managing stress, and avoiding smoking. If you are taking medications related to inflammation or cardiovascular health, never alter your dosing based on a genetic test result. Always discuss your genetic findings and any health concerns with a qualified clinician or pharmacist who can provide personalized medical advice.
How common is this variant?
The rs1800796 variant exhibits strong ancestry-specific distribution; the C allele is highly frequent in East Asian populations (approximately 79 percent) but rare in European (5 percent) and African (10 percent) populations.
Frequently asked questions
What is the rs1800796 variant?
The rs1800796 variant is a genetic polymorphism located in the promoter region of the IL6 gene. It influences the body's production of interleukin-6, a key protein involved in regulating inflammation and immune responses.
Does rs1800796 cause colorectal cancer?
No. While some older or unverified catalog entries mistakenly link this rsID to the MLH1 gene and colorectal cancer, authoritative genomic databases confirm rs1800796 is in the IL6 gene. It is primarily associated with inflammation and cardiovascular traits, not mismatch repair or hereditary colorectal cancer.
What does the IL6 gene do?
The IL6 gene provides instructions for making interleukin-6, a cytokine that acts as a messenger in the immune system. It helps trigger acute inflammation to fight infections but can contribute to chronic health issues if levels remain elevated long-term.
Is the C allele at rs1800796 bad for my health?
Not necessarily. While the C allele has been statistically associated with a slightly higher risk for certain cardiovascular conditions like abdominal aortic aneurysms in some studies, the overall effect size is small. It is also the most common allele in East Asian populations, demonstrating that it is a normal human variation.
Can I change my IL-6 levels if I have a risk genotype?
Yes, genetic variants only play a partial role in determining your inflammation levels. Lifestyle choices such as a healthy diet, regular exercise, and avoiding smoking have a profound impact on systemic inflammation and can help mitigate genetic predispositions.
Sources & further reading
Educational information only, last refreshed 9/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs1800796?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in MLH1
Located in the MLH1 mismatch repair gene promoter, this variant is studied for its role in colorectal cancer susceptibility and DNA repair efficiency.
This promoter variant is associated with altered expression levels and potential risk for Lynch syndrome-related cancers.