CDKN2B-AS1 rs1333052: What Your Genotype Means
The rs1333052 variant is a genetic marker located within the CDKN2B-AS1 gene region on chromosome 9p21.3. It has been studied for its potential association with endometriosis, a complex condition involving the growth of tissue similar to the uterine lining outside the uterus.
What each genotype means
Typical risk profile
You carry two copies of the C allele at rs1333052 in the CDKN2B-AS1 region on chromosome 9p21.3. Published genome-wide association studies link this baseline genotype with the standard or reference risk of developing severe pelvic endometriosis. Because evidence for this specific variant is limited and influenced by ancestry, this genotype reflects a standard background baseline rather than protection against the condition.
Found in approximately 25% to 30% of individuals of European ancestry and around 36% of individuals of East Asian ancestry.
Slightly increased risk profile
You carry one copy of the T risk allele and one copy of the C allele at rs1333052. Research indicates that each copy of the T allele is associated with a modest statistical increase in the risk of severe pelvic endometriosis and altered endometrial proliferation. However, overall evidence for this marker remains limited, and carrying this allele is only one factor among many contributing to complex reproductive traits.
Carried by approximately 45% to 50% of individuals of European ancestry and roughly 48% of individuals of East Asian ancestry.
Moderately elevated risk profile
You carry two copies of the T risk allele at rs1333052 within the CDKN2B-AS1 locus. In population association studies, homozygous carriage of this allele has been linked to a higher relative predisposition to severe pelvic endometriosis compared to other genotypes. Given the limited strength of evidence and complex genetic architecture of the 9p21.3 locus, this result describes a statistical population association rather than a clinical diagnosis.
Observed in roughly 20% to 25% of individuals of European ancestry and approximately 16% of individuals of East Asian ancestry.
Understanding the Variant and Its Location
The rs1333052 variant is a single nucleotide polymorphism (SNP) situated on chromosome 9p21.3. This specific region of the human genome is well-known in genetic research as a 'hotspot' for various health-related traits. The variant is located within the CDKN2B-AS1 gene, which stands for Cyclin-dependent kinase inhibitor 2B antisense RNA. This gene produces a long non-coding RNA molecule, often referred to as ANRIL. Unlike protein-coding genes that provide instructions for building cellular machinery, non-coding RNAs like ANRIL act as regulators, influencing how other genes in the nearby CDKN2B-CDKN2A cluster are expressed. Because this region is involved in critical cellular processes such as cell cycle regulation and proliferation, variations here are frequently investigated for their potential impact on disease susceptibility.
The Role of CDKN2B-AS1
The CDKN2B-AS1 gene is a functional RNA molecule that plays a significant role in epigenetic regulation. It interacts with protein complexes known as Polycomb Repressive Complexes (PRC1 and PRC2). By binding to these complexes, the RNA molecule helps silence specific genes within the 9p21 cluster. This silencing mechanism is essential for controlling cell growth and preventing uncontrolled proliferation. When genetic variants occur in this region, they may alter the expression levels of these regulatory RNAs, potentially disrupting the balance of cell cycle control. Research into this locus is ongoing, as scientists work to determine exactly how these regulatory changes contribute to the development of complex conditions like endometriosis, where endometrial-like tissue grows in areas where it does not belong.
Research Associations and Evidence Strength
The association between the 9p21.3 locus and endometriosis has been a subject of significant interest in genome-wide association studies (GWAS). While several SNPs in the CDKN2B-AS1 region have shown reproducible signals across different populations, the evidence for any single variant, including rs1333052, is often described as limited or context-dependent. Research indicates that the genetic architecture of endometriosis is complex, involving many small-effect variants rather than a single causative mutation. Some variants in this region show strong associations in Japanese populations but may have different frequencies or effects in European cohorts. Consequently, while the 9p21.3 region is clearly linked to the condition, the specific contribution of rs1333052 remains a topic of active investigation. It is important to note that genetic association does not imply direct causation, and many environmental and lifestyle factors also influence the development of endometriosis.
Population Frequency and Diversity
Genetic variants often show significant differences in frequency across global populations due to evolutionary history and genetic drift. For the CDKN2B-AS1 region, researchers have observed that certain risk alleles are common in some ancestries while being rare or absent in others. The minor allele frequency for variants in this locus typically ranges between 0.40 and 0.50 in European and East Asian populations. These high frequencies suggest that these variants are common polymorphisms rather than rare mutations. However, the specific linkage disequilibrium structure—how closely different SNPs are inherited together—varies significantly between populations. This means that a variant serving as a reliable marker for a trait in one group may not provide the same predictive value in another. Understanding these population-specific patterns is a fundamental part of modern genomics.
Interpreting Your Genetic Information
If you have received information about your genotype for rs1333052, it is important to view it within the context of current scientific understanding. This variant is a marker of statistical association, not a diagnostic tool. Having a specific genotype does not mean you will develop a condition, nor does it guarantee protection from one. Endometriosis is a multifactorial condition influenced by a complex interplay of genetics, environment, and individual health history. You cannot use this information to diagnose yourself or predict future health outcomes. If you have concerns about your reproductive health or symptoms such as pelvic pain, the most effective step is to consult with a healthcare professional. They can provide a clinical evaluation based on your symptoms and medical history, which are far more informative than any single genetic variant.
How common is this variant?
The minor allele frequency for this variant is approximately 0.45-0.50 in European populations and approximately 0.40 in East Asian populations.
Frequently asked questions
Is rs1333052 a diagnostic test for endometriosis?
No, rs1333052 is not a diagnostic test. It is a genetic marker associated with the condition in research studies, but it cannot be used to confirm or rule out a diagnosis of endometriosis.
What does it mean if I have the 'risk' allele?
Having a risk allele simply means you carry a genetic variant that has been statistically associated with a higher likelihood of a condition in large population studies. It does not mean you will develop the condition, as many other factors contribute to health.
Can I change my risk based on my genotype?
Genetic variants are inherited and cannot be changed. However, focusing on overall health, regular medical check-ups, and discussing any symptoms with a doctor are the best ways to manage your health regardless of your genetic profile.
Why do different studies report different results for this gene?
Different results often occur due to variations in study design, the size of the populations studied, and differences in genetic background between ethnic groups. This is common in the study of complex, multifactorial conditions.
Sources & further reading
Educational information only, last refreshed 10/17/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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