Chronic low-grade inflammation is the common biological thread linking cardiovascular disease, neurodegeneration, metabolic syndrome, and accelerated aging.
The IL6 promoter variant, which influences baseline production of interleukin-6, one of the body's main inflammatory signals.
The Biology
Acute inflammation is protective and essential. Chronic, low-grade systemic inflammation is associated with many age-related diseases. Signaling proteins called cytokines, such as interleukin-6 (IL-6), set this inflammatory tone, and how much of them a person makes varies partly because of variants in the genes that encode them.
What Varia Analyzes
IL6 (rs1800795), the -174 promoter variant, associated with differences in baseline IL-6 transcription and plasma IL-6 levels (Fishman et al., 1998).
Why It Matters
IL-6 is one of the most studied inflammatory signals in aging research. In an Italian study of 700 people aged 60 to 110, men with two copies of the G allele at this position had higher IL-6 levels and were less common among centenarians; the same pattern was not seen in women (Bonafè et al., 2001). The variant describes a tendency seen in population studies, not your current level of inflammation, which a blood test measures.
Not in Varia's Catalog
Other inflammation variants often discussed are not in the catalog: IL1A (rs1800587), IL1B (rs1143634, rs16944), IL10 (rs1800896), TNF (rs1800629), and SOD2 Val16Ala (rs4880). Varia does not read these from your file, so a scan reports nothing about them either way.