WDFY4 rs1913517: Understanding Your Genetic Association
The rs1913517 variant is a single nucleotide polymorphism located within the WDFY4 gene. It has been identified through genome-wide association studies as a genetic marker associated with an increased risk of systemic lupus erythematosus (SLE), specifically in individuals of East Asian ancestry.
What each genotype means
Increased lupus risk profile
This genotype includes two copies of the risk allele associated with systemic lupus erythematosus (SLE) in East Asian populations. Research indicates that individuals with this genotype may have a statistically higher susceptibility to developing SLE compared to those without the risk allele. This is a complex genetic association, and having this genotype does not mean you will develop the condition.
This genotype is common in East Asian populations, where the risk allele frequency is approximately 0.33.
Moderate lupus risk profile
This genotype includes one copy of the risk allele associated with systemic lupus erythematosus (SLE). Statistical studies suggest that carrying one copy of this variant may confer a modest increase in risk for SLE compared to individuals who carry no risk alleles. As with all complex traits, this genetic factor is only one part of a broader picture involving other genes and environmental influences.
This heterozygous genotype is frequently observed in populations where the risk allele is prevalent, such as in East Asian cohorts.
Baseline lupus risk profile
This genotype represents the absence of the specific risk allele associated with systemic lupus erythematosus (SLE) at this location. Individuals with this genotype do not carry the variant identified in GWAS studies as being linked to increased SLE susceptibility in East Asian populations. This profile is considered the baseline for this specific genetic marker.
This genotype is common across various ancestral groups, representing the non-risk state for this specific variant.
What is rs1913517?
A single nucleotide polymorphism (SNP) is a variation at a single position in a DNA sequence among individuals. The variant rs1913517 is located within the WDFY4 gene, which sits on chromosome 10. In the context of genetic research, SNPs like rs1913517 are often studied to understand how specific DNA changes might correlate with complex traits or disease susceptibility. This particular variant has been highlighted in scientific literature as a significant signal in studies focusing on autoimmune conditions. It is important to note that being a 'risk variant' does not mean that an individual will develop a disease; rather, it indicates that the presence of this specific genetic marker is statistically more common in groups of people who have been diagnosed with a particular condition compared to those who have not. These associations are identified through large-scale genome-wide association studies (GWAS) that compare the genomes of thousands of individuals.
The Role of the WDFY4 Gene
The WDFY4 gene, which stands for WDFY family member 4, provides instructions for making a protein that plays a critical role in the immune system. Research has shown that the WDFY4 protein is essential for a process called cross-presentation, where certain immune cells, such as dendritic cells, capture and present antigens to T cells to initiate an immune response. This mechanism is vital for the body's ability to recognize and fight off viral infections and tumors. Because the immune system must be tightly regulated to distinguish between foreign threats and the body's own tissues, disruptions in genes like WDFY4 can potentially influence immune signaling pathways. When these pathways are altered, it may contribute to the development of autoimmune diseases, where the immune system mistakenly attacks healthy cells. Understanding the function of WDFY4 helps researchers piece together the complex biological puzzle of how genetic variations can influence immune system behavior.
Research and Evidence Strength
The association between rs1913517 and systemic lupus erythematosus (SLE) is supported by moderate evidence, primarily derived from GWAS conducted in East Asian populations. SLE is a complex, multifactorial autoimmune disease, and its genetic architecture involves many different variants, each contributing a small amount to the overall risk. Studies have consistently identified the WDFY4 region as a susceptibility locus for SLE. While the statistical association is robust in the populations studied, it is essential to recognize that genetic risk is only one piece of the puzzle. Environmental factors, lifestyle, and other genetic variants also play significant roles in the development of autoimmune conditions. The evidence strength is considered moderate because, while the link is statistically significant, the exact functional mechanism by which this specific SNP influences disease risk is still an active area of investigation. Researchers continue to study how this variant might alter gene expression or protein function to better understand its biological impact.
Population Frequency
Genetic variants are not distributed equally across all human populations. The rs1913517 variant shows a notable frequency in East Asian populations, where it has been reported at a frequency of approximately 0.33. This means that the variant is relatively common in these groups. In contrast, the frequency of this variant may differ significantly in other ancestral groups, such as those of European or African descent. This variation in frequency is a common theme in human genetics, reflecting the unique evolutionary history and migration patterns of different populations. When interpreting genetic data, it is crucial to consider the ancestral context, as a variant that is a significant risk factor in one population may not have the same association or frequency in another. Researchers use this information to refine their understanding of how genetic risk factors are distributed globally and to ensure that medical research is inclusive and representative of diverse human populations.
What This Information Means for You
Learning about a genetic variant like rs1913517 can be an educational experience, but it is important to maintain a balanced perspective. This information is intended for informational purposes and should not be used to diagnose or predict the development of any medical condition. Genetic associations are statistical in nature and do not provide a definitive medical outcome for any individual. If you are concerned about your health or have a family history of autoimmune conditions, the most appropriate step is to consult with a healthcare professional, such as a primary care physician or a rheumatologist. They can provide personalized guidance based on your clinical history, symptoms, and physical examinations, which are far more informative than genetic data alone. Avoid making any changes to your health regimen or medical care based solely on genetic test results without first discussing them with a qualified clinician who can interpret the findings in the context of your overall health.
How common is this variant?
The rs1913517 variant has a reported frequency of approximately 0.33 in East Asian populations, making it a relatively common genetic marker in that demographic.
Frequently asked questions
Does having the rs1913517 variant mean I will get lupus?
No, having this variant does not mean you will develop systemic lupus erythematosus. It is simply a genetic marker that has been statistically associated with a higher risk in certain populations, but many other factors contribute to the development of the disease.
Can I use this information to diagnose myself?
No, you cannot use genetic information to diagnose yourself. Autoimmune diseases are complex and require a clinical evaluation by a healthcare professional, including blood tests and a review of your symptoms and medical history.
Why is this variant only mentioned for East Asian populations?
Genetic studies often find that certain variants are more common or have stronger associations in specific ancestral groups due to historical population patterns. This does not mean the variant is absent in other groups, but the research evidence is most robust for East Asian populations.
Should I change my diet or lifestyle based on this SNP?
There is no evidence that specific lifestyle changes are required based on this SNP. You should always consult with your doctor before making significant changes to your health routine, as they can provide advice tailored to your specific health needs.
Sources & further reading
Educational information only, last refreshed 9/23/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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