TNFAIP3 rs6920220: What Your Genotype Means
The genetic variant rs6920220 is a common single nucleotide polymorphism located in an intergenic region of chromosome 6q23 near the TNFAIP3 gene. Genome-wide association studies have linked the minor A allele to a modest, statistically significant increase in susceptibility to several autoimmune conditions, notably rheumatoid arthritis and systemic lupus erythematosus. However, it functions only as a polygenic risk factor rather than a direct diagnostic cause of disease.
What each genotype means
| Genotype | What the research suggests | Reading |
|---|---|---|
| GG | Carries two copies of the major G allele. This is the baseline and most frequent genotype in most global populations, associated with standard population-level risk for autoimmune conditions. | Informational |
| GA | Carries one copy of the reference G allele and one copy of the minor A allele. Statistical studies associate this heterozygous genotype with a modestly higher relative predisposition to certain autoimmune conditions compared to GG homozygotes. | Higher attention |
| AA | Carries two copies of the minor A allele. This genotype has been associated with a slightly higher relative risk profile for conditions such as rheumatoid arthritis and systemic lupus erythematosus in population studies. | Higher attention |
Genomic Location and Variant Characteristics
The single nucleotide polymorphism rs6920220 represents a substitution between guanine (G) and adenine (A) on chromosome 6 at band 6q23. This variant sits in an intergenic non-coding regulatory region adjacent to the TNFAIP3 gene. Because it is located outside protein-coding exons, rs6920220 does not alter the primary amino acid sequence of any cellular protein. Instead, researchers believe it may influence gene expression regulatory elements, such as distant enhancers or chromatin architecture, which help coordinate how neighboring genes are transcribed in immune cell subsets. In cataloged references, the G allele represents the ancestral reference base, whereas the A allele represents the minor, alternative variant allele.
The Biological Role of the TNFAIP3 Gene
The TNFAIP3 gene encodes tumor necrosis factor alpha-induced protein 3, commonly known as A20. This enzyme exhibits dual ubiquitin-editing activities, functioning as a critical natural 'brake' on inflammatory signaling pathways inside immune cells. When inflammatory triggers stimulate cells via tumor necrosis factor receptors or toll-like receptors, A20 is rapidly expressed to restrict the nuclear factor kappa B (NF-kappa-B) pathway. By terminating excessive NF-kappa-B signaling, A20 prevents runaway inflammation and protects tissues from continuous immune-mediated damage. Severe loss-of-function coding mutations in TNFAIP3 can cause rare, severe monogenic autoinflammatory syndromes like haploinsufficiency of A20, highlighting the central role this locus plays in immune homeostasis.
Autoimmune Associations and Evidence Strength
Multiple candidate gene studies and genome-wide association studies (GWAS) have established that the 6q23 locus containing rs6920220 is associated with autoimmune phenotypes. The minor A allele is statistically correlated with a moderately elevated relative risk for polygenic autoimmune conditions, including rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), and primary Sjogren's syndrome (pSS). In studies of European cohorts, the odds ratios associated with carrying the risk allele typically hover in modest ranges, such as 1.2 to 2.0. However, the evidence strength for rs6920220 acting directly on disease expression remains characterized as limited to moderate because the variant confers only a small fraction of overall disease susceptibility in complex polygenic traits.
Clinical Interpretation and Limitations
Having an autoimmune-associated genotype at rs6920220 is not a clinical diagnosis and cannot predict whether an individual will develop rheumatoid arthritis, lupus, or any other autoimmune disorder. Autoimmune conditions are complex, multi-factorial traits shaped by hundreds of background genetic variants, sex hormones, lifestyle factors, and environmental triggers such as infections. The presence of the A allele slightly shifts statistical risk across large populations, but the vast majority of individuals carrying this allele never experience autoimmune pathology. Genetic findings for this variant cannot replace formal medical evaluation, laboratory markers, or physical examinations by a healthcare professional.
How common is this variant?
The minor A allele frequency is approximately 0.20 to 0.25 in populations of European ancestry, while it occurs at substantially lower frequencies in East Asian populations.
Frequently asked questions
Does having the A allele at rs6920220 mean I will develop an autoimmune disease?
No, it does not. The A allele confers a minor statistical increase in population-level risk, but it does not cause disease on its own. The vast majority of people with this allele remain healthy and never develop rheumatoid arthritis or lupus.
What does the TNFAIP3 gene do in the body?
TNFAIP3 produces the A20 protein, an essential regulator of the immune system. A20 acts as an off switch for the NF-kappa-B pathway, helping the body shut down inflammatory responses once an infection or threat is resolved.
Can I use rs6920220 results to guide my medical treatments?
No, this genetic variant is not used in clinical decision-making or pharmacogenomic dosing algorithms. If you have symptoms or questions regarding autoimmune disease management or medications, consult a qualified physician or rheumatologist.
How common is this genetic variant across different ancestries?
The minor A allele is relatively common in European-descended populations, with an allele frequency between 20% and 25%. In contrast, it is observed at much lower rates in East Asian populations.
Sources & further reading
Educational information only, last refreshed 9/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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