What you carry at this position in your DNA and what research says about it.
Inflammation and Longevity: 6/10 evidence, 25 publications.
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Sample genotype (not yours): A/A
Enhanced Longevity and Lower Alzheimer's Risk
This genotype is associated with a higher likelihood of exceptional lifespan and a reduced risk of late-onset Alzheimer's disease. However, it may also lead to higher inflammatory responses during certain acute infections.
What this genotype means: Increased likelihood of exceptional longevity; Reduced risk of late-onset Alzheimer's disease; Potentially higher inflammatory response during acute infections.
Sample genotype (not yours): A/G
Typical Inflammatory Response and Average Lifespan
This genotype represents a balanced genetic profile with typical baseline IL-6 expression and average risks for age-related conditions. It carries one copy of each allele, resulting in intermediate inflammatory activity.
What this genotype means: Typical baseline IL-6 expression; Standard risk for age-related cognitive decline; Average susceptibility to inflammatory complications.
Sample genotype (not yours): G/G
Lower Infection Severity but Higher Alzheimer's Risk
This genotype is protective against severe inflammatory complications from infections but is associated with a higher risk of Alzheimer's disease and reduced longevity.
What this genotype means: Reduced risk of critical illness during severe infections; Increased risk of late-onset Alzheimer's disease; Lower likelihood of exceptional longevity.
Gene function and biological role
Gene Function: Interleukin 6, encoded by the IL6 gene, is a key cytokine that acts as both a pro-inflammatory agent and an anti-inflammatory signal. It plays a central role in regulating the body's immune response to infections and tissue injuries. Chronic elevation of this cytokine is widely linked to systemic inflammation, which accelerates biological aging and drives age-related diseases. Conversely, tightly regulated expression helps maintain tissue homeostasis and supports healthy aging.
Variant Impact: The rs2069837 variant is an intronic single nucleotide polymorphism located within an enhancer region of the IL6 gene. This genetic change alters the binding of transcription factors, directly modulating the expression levels of IL-6 and nearby immune-related genes [1]. Specifically, the A allele is associated with higher baseline IL-6 activity and the suppression of certain anti-inflammatory pathways [1]. In contrast, the G allele reduces IL-6 expression, which significantly dampens the systemic inflammatory response during acute immune challenges [2].
Key Insight: This variant represents an evolutionary trade-off where the same genetic copy that protects against late-life cognitive decline also increases susceptibility to rare autoimmune blood vessel inflammation.
Location: IL6. Chromosome 7 · 7p15.3 · 22.7 Mb
Estimated prevalence by population
Global 81.8%; European 85.9%; African 76.7%; East Asian 68.9%; South Asian 70.2%; Americas 83.4%; Ashkenazi 75.8%; Finnish 87.5%; Middle Eastern 65.0%; Amish 83.8%.
Estimated AA genotype frequency.
Global 17.2%; European 13.6%; African 21.7%; East Asian 28.2%; South Asian 27.2%; Americas 15.8%; Ashkenazi 22.5%; Finnish 12.1%; Middle Eastern 31.3%; Amish 15.5%.
Estimated AG genotype frequency.
Global 1.0%; European 0.5%; African 1.5%; East Asian 2.9%; South Asian 2.6%; Americas 0.7%; Ashkenazi 1.7%; Finnish 0.4%; Middle Eastern 3.8%; Amish 0.7%.
Estimated GG genotype frequency.
Showing effects for A/A genotype
Lifestyle, Fitness & Aging
Aging & Longevity
Lifespan. Evidence: 6/10. Source: PMID 31413261. Increased Lifespan.
Neurology & Mental Health
Neurodegenerative Diseases
Alzheimer's Disease. Evidence: 3/10. Source: PMID 22272811. Lower Risk.
Immunity & Inflammation
Infection Susceptibility & Resistance
COVID-19 Severity. Evidence: 4/10. Source: PMID 35368020. Increased Severity.
Autoimmune Diseases
Takayasu Arteritis. Evidence: 4/10. Source: PMID 25604533. Increased Risk.
Showing effects for A/G genotype
Lifespan. Evidence: 6/10. Source: PMID 31413261. Typical Lifespan.
Alzheimer's Disease. Evidence: 3/10. Source: PMID 22272811. Typical Risk.
COVID-19 Severity. Evidence: 4/10. Source: PMID 35368020. Typical Severity.
Takayasu Arteritis. Evidence: 4/10. Source: PMID 25604533. Typical Risk.
Showing effects for G/G genotype
Lifespan. Evidence: 6/10. Source: PMID 31413261. Reduced Lifespan.
Alzheimer's Disease. Evidence: 3/10. Source: PMID 22272811. Increased Risk.
COVID-19 Severity. Evidence: 4/10. Source: PMID 35368020. Lower Severity.
Takayasu Arteritis. Evidence: 4/10. Source: PMID 25604533. Lower Risk.
What this genotype means for the people who carry it
Sample genotype: AA (Homozygous)
Carrying two copies of the A allele is linked to a significantly increased probability of reaching extreme old age [1]. Research indicates that this genetic profile is highly protective against late-onset Alzheimer's disease, potentially due to its long-range regulatory effects on immune pathways [2]. On the other hand, the A allele is associated with higher baseline levels of the inflammatory cytokine IL-6 [3]. This elevated inflammatory state can increase susceptibility to rare autoimmune conditions such as Takayasu arteritis [4]. Additionally, during severe respiratory infections like COVID-19, higher IL-6 expression may contribute to a more intense cytokine storm, leading to a higher risk of critical illness [3]. Despite these acute risks, the overall statistical trend strongly favors healthy cognitive aging and extended lifespan for carriers of this genotype [1] [2].
Increased likelihood of exceptional longevity; Reduced risk of late-onset Alzheimer's disease; Potentially higher inflammatory response during acute infections.
Sample genotype: AG (Heterozygous)
Having one copy of each allele results in a balanced genetic influence on systemic inflammation and aging. Baseline levels of the IL-6 cytokine and associated immune responses generally fall within the typical range for the population [1]. The risk of developing late-onset Alzheimer's disease remains at the standard baseline level, without the pronounced protection seen in the homozygous A/A genotype [2]. Similarly, the likelihood of experiencing severe complications from acute inflammatory events, such as critical COVID-19, is typical [1]. This intermediate profile does not significantly elevate or lower the risk for rare autoimmune vascular conditions like Takayasu arteritis [3]. Overall, this genotype represents the common genetic baseline, meaning lifestyle factors such as diet and exercise will play the primary role in determining long-term inflammatory health and lifespan.
Typical baseline IL-6 expression; Standard risk for age-related cognitive decline; Average susceptibility to inflammatory complications.
Sample genotype: GG (Homozygous)
Carrying two copies of the G allele leads to significantly lower baseline and induced levels of the inflammatory cytokine IL-6 [1]. This reduced inflammatory response is highly protective during acute infections, dramatically lowering the risk of critical illness and cytokine storms in conditions like COVID-19 [1]. It is also associated with a decreased risk of rare autoimmune vascular disorders such as Takayasu arteritis [2]. However, this lower inflammatory activity comes with a significant long-term trade-off. Individuals with this genotype have a lower statistical probability of reaching exceptional longevity [3]. Furthermore, the G allele is associated with an increased risk of developing late-onset Alzheimer's disease, likely due to altered immune surveillance and tissue repair mechanisms in the brain [4]. Managing systemic health through anti-inflammatory lifestyle choices remains highly beneficial to support healthy brain aging.
Reduced risk of critical illness during severe infections; Increased risk of late-onset Alzheimer's disease; Lower likelihood of exceptional longevity.
Variants with shared genetic architecture
rs1800795 · IL6 Gene · Chr 7 · Inflammation and Diabetes Risk
rs1800797 · IL6 Gene · Chr 7 · Inflammation and Joint Risk
rs1800796 · IL6 Gene · Chr 7 · Inflammatory Response
A genetic variant in IL-6 lowering its expression is protective for critical patients with COVID-19.
A meta-analysis of genome-wide association studies identifies multiple longevity genes.
Content updated August 2026.
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