WNT4 rs7521902: What Your Genotype Means
The rs7521902 variant is a single nucleotide polymorphism located near the WNT4 gene, which has been identified in large-scale studies as a genetic marker associated with susceptibility to endometriosis. While some research links this variant to the condition, the strength of this association varies significantly depending on the population studied.
What each genotype means
Slightly elevated endometriosis risk
You carry two copies of the A allele at this intergenic locus near WNT4. In genome-wide association studies and meta-analyses, this genotype has been linked to a modestly higher relative statistical risk of developing moderate-to-severe (stage III/IV) endometriosis compared to carriers of the C allele. However, because endometriosis is complex and influenced by many genetic and non-genetic factors, carrying this genotype does not cause or diagnose the condition.
Carried by approximately 40% to 50% of individuals in European and East Asian populations.
Intermediate endometriosis risk
You carry one copy of the A allele and one copy of the C allele at this regulatory locus upstream of WNT4. Research suggests this heterozygous genotype is associated with an intermediate statistical risk for advanced endometriosis relative to homozygous genotypes. Findings across individual cohorts can be variable, and carrying one copy of the risk allele does not imply a clinical diagnosis.
Carried by roughly 40% to 45% of individuals across European and other multi-ethnic populations.
Slightly reduced endometriosis risk
You carry two copies of the C allele at this genetic locus near WNT4. Published meta-analyses of case-control studies indicate that the CC genotype is statistically associated with a modest decrease in the odds of developing endometriosis compared to carriers of the A allele. This protective statistical effect is subtle and does not entirely eliminate the chance of developing reproductive tract conditions.
Carried by roughly 10% to 15% of people of European ancestry and at broadly similar frequencies in East Asian cohorts.
Understanding the rs7521902 Variant
The rs7521902 variant is a single nucleotide polymorphism (SNP) situated on chromosome 1, approximately 21 kilobases away from the WNT4 gene. In genetics, an SNP represents a variation at a single position in the DNA sequence among individuals. Because this variant is located in a regulatory region rather than within the protein-coding sequence of the gene itself, it is thought to influence how the WNT4 gene is expressed or regulated. Researchers study such variants to understand the underlying genetic architecture of complex, multifactorial conditions. It is important to note that the presence of a specific allele at this location does not cause a disease on its own; rather, it is one of many potential genetic factors that may contribute to an individual's overall risk profile for certain health conditions.
The Role of the WNT4 Gene
The WNT4 gene, or Wingless-type MMTV integration site family member 4, plays a critical role in the development of the female reproductive tract. It is involved in various biological processes, including the formation of the Müllerian ducts, which eventually develop into the uterus, fallopian tubes, and the upper portion of the vagina. Because of its essential function in reproductive tissue development and its expression in the endometrium throughout the menstrual cycle, WNT4 has long been considered a strong candidate gene for research into endometriosis. Endometriosis is a complex condition where tissue similar to the lining of the uterus grows outside of it. By investigating how variants like rs7521902 might alter WNT4 activity, scientists aim to better understand the molecular pathways that contribute to the development and progression of this condition.
Research and Evidence Strength
The association between rs7521902 and endometriosis has been the subject of numerous studies, with results that are notably mixed. Large-scale genome-wide association studies (GWAS) have identified this locus as a significant risk factor in certain cohorts. However, replication studies have yielded inconsistent results. For instance, while some meta-analyses have suggested a potential link, other studies conducted in specific ethnic populations—such as Chinese Han or certain Mediterranean groups—have failed to find a statistically significant association. These discrepancies highlight the complexity of genetic research, where environmental factors, gene-gene interactions, and ancestral differences can influence whether a specific variant appears to affect disease risk. Consequently, the evidence for rs7521902 as a definitive predictor of endometriosis remains limited and context-dependent, rather than universally applicable across all human populations.
Interpreting Your Genetic Information
If you have information about your genotype for rs7521902, it is important to view it within the context of current scientific limitations. Genetic variants associated with complex traits like endometriosis rarely act as standalone diagnostic tools. Because the association of this SNP is inconsistent across different ancestries and studies, it cannot be used to predict an individual's health outcomes or to diagnose a medical condition. Genetic testing for such markers is generally not used in clinical practice for risk assessment. If you have concerns about your reproductive health or symptoms related to endometriosis, the most appropriate step is to consult with a healthcare professional, such as a gynecologist. They can provide a comprehensive evaluation based on your personal medical history, physical examinations, and diagnostic imaging, which are far more reliable than any single genetic marker.
How common is this variant?
The rs7521902 variant is a common polymorphism, but its minor allele frequency varies significantly across different global populations and ancestral groups.
Frequently asked questions
Can I use rs7521902 to diagnose endometriosis?
No. This variant is a genetic marker associated with risk in some studies, but it is not a diagnostic test. Endometriosis is a complex condition that requires clinical evaluation by a doctor.
Why do some studies say this variant is linked to endometriosis while others do not?
Genetic associations for complex diseases often vary due to differences in study design, sample sizes, and the ancestral backgrounds of the participants. This is common in research on multifactorial conditions.
Is WNT4 the only gene involved in endometriosis?
No. Endometriosis is a complex, polygenic condition, meaning it is influenced by many different genes and environmental factors working together, rather than a single gene.
Should I be worried if I have the 'risk' allele for this SNP?
No. Having a specific allele does not mean you will develop a condition. Genetic risk factors are only one small part of a much larger picture that includes your overall health and environment.
Sources & further reading
Educational information only, last refreshed 10/26/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the WNT4 locus is significantly associated with the risk of endometriosis and influences reproductive tract development.
Missense mutations in WNT4 are associated with atypical Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome and disorders of sex development.
Variant associated with variation in bone mineral density, timing of menarche, and reproductive span traits.
Common regulatory variant near WNT4 consistently associated with endometriosis risk and female reproductive tract morphology.
Non-coding regulatory variant in the WNT4 region associated with pelvic endometriosis, uterine fibroid risk, and Müllerian duct development.
Regulatory variant near WNT4 associated with risk of endometriosis and ovarian cancer, influencing reproductive hormone regulation.