DENND1A rs2479102: What Your Genotype Means
The rs2479102 variant is an intronic single nucleotide polymorphism located within the DENND1A gene on chromosome 9. In genome-wide association studies, genomic regions harboring DENND1A have been linked to susceptibility to polycystic ovary syndrome (PCOS). However, direct evidence connecting rs2479102 specifically to clinical outcomes remains limited and varies significantly across different ancestral populations.
What each genotype means
Typical risk profile
You carry two copies of the C allele at this locus, which represents the standard background genetic variation in this region of the DENND1A gene. Research studies have not identified an increased statistical association with polycystic ovary syndrome (PCOS) for this baseline genotype. Because PCOS is a multifactorial condition influenced by many genes and environmental factors, this result reflects only a baseline risk profile at this specific position.
Carried by approximately 81% of individuals of European ancestry and roughly 52% of individuals of East Asian ancestry.
Modestly elevated PCOS susceptibility
You carry one copy of the T risk allele for rs2479102 in the DENND1A gene. Genome-wide association research has linked this allele to a modest statistical increase in susceptibility to polycystic ovary syndrome (PCOS), though evidence across different ethnic groups remains limited and mixed. Carrying this single copy does not indicate a diagnosis of PCOS, as complex reproductive traits are shaped by many combined genetic and lifestyle influences.
Carried by approximately 18% of people of European ancestry and about 40% of people of East Asian ancestry.
Elevated PCOS susceptibility
You carry two copies of the T risk allele in the DENND1A gene, which has been associated with increased susceptibility to polycystic ovary syndrome (PCOS) in population genetics studies. However, the strength of this association varies among different populations, and overall clinical evidence for this specific variant remains limited. Having this genotype is a statistical risk factor and does not mean you have or will develop PCOS.
Carried by roughly 1% of individuals of European descent and approximately 8% of individuals of East Asian descent.
What is rs2479102 and Where is It Found?
The single nucleotide polymorphism (SNP) rs2479102 is a common variation located within an intronic, non-protein-coding region of the DENND1A gene on human chromosome 9. Because it lies within an intron, rs2479102 does not change the amino acid sequence of the resulting DENND1A protein. Instead, non-coding variants of this kind typically act as markers in linkage disequilibrium with other nearby genetic markers or potentially influence regulatory elements that dictate how, when, or how strongly a gene is transcribed. Researchers commonly investigate such intronic markers in large cohorts to isolate regional association signals with reproductive and metabolic health.
The Biological Role of the DENND1A Gene
The DENND1A gene encodes the protein DENN domain containing 1A (connecdenn 1), which functions as a guanine nucleotide exchange factor for Rab family GTPases, specifically Rab35. These GTPases play central roles in clathrin-mediated endocytosis, intracellular receptor recycling, and vesicular membrane trafficking. In reproductive biology, laboratory studies have highlighted DENND1A as an important factor in ovarian function. In particular, alternative splice variants such as DENND1A variant 2 (DENND1A.V2) have been shown to be overexpressed in the ovarian theca cells of women with polycystic ovary syndrome, driving increased CYP17A1 expression and stimulating androgen biosynthesis.
What the Research Associates with rs2479102
DENND1A was initially pinpointed as a prime susceptibility locus in genome-wide association studies (GWAS) investigating polycystic ovary syndrome (PCOS). While several tag SNPs in this genomic block—such as rs2479106 and rs10818854—have repeatedly replicated across East Asian and European cohorts, individual evidence specifically isolating rs2479102 is limited and mixed. While early GWAS cataloged the region as harboring strong disease susceptibility, follow-up fine-mapping and tag SNP replication studies in specific cohorts, such as Han Chinese populations, have reported that rs2479102 did not reach statistical significance independently, suggesting it may serve as an indirect marker tagging other primary causal or regulatory variants within the locus.
Ancestry and Population Variations
The distribution of alleles at the rs2479102 locus shows measurable variation across global populations. In East Asian populations, the minor allele frequency is observed at roughly 0.28, whereas in populations of European descent, it occurs at an estimated frequency of approximately 0.10. Such divergence in allele frequencies and local linkage disequilibrium structures is common across human genomes and often explains why genetic association signals discovered in one ancestral background do not always directly transfer or exhibit identical effect sizes in others.
Understanding What You Can and Cannot Do With This Information
It is critical to interpret rs2479102 results with caution. Having a genotype that correlates with PCOS susceptibility in population studies does not mean an individual has PCOS or will ever develop it, just as lacking risk alleles provides no guarantee against the condition. Complex conditions like PCOS stem from a multi-factorial interplay between dozens of common genetic variants, rare variations, and environmental factors like diet, exercise, and metabolic health. Genetic test results for non-diagnostic variants like rs2479102 should never be used as a standalone medical diagnosis. Anyone experiencing irregular menstrual cycles, signs of hyperandrogenism, or fertility challenges should consult an endocrinologist or gynecologist for a comprehensive clinical assessment.
How common is this variant?
The minor allele frequency for rs2479102 is approximately 0.28 in East Asian populations and approximately 0.10 in European populations, reflecting distinct regional allele distributions.
Frequently asked questions
Does having the rs2479102 risk allele mean I will develop PCOS?
No, carrying a variant allele at rs2479102 does not mean you have or will develop PCOS. PCOS is a complex multi-factorial condition influenced by many genetic loci, hormone regulation, and lifestyle factors. This SNP is merely an intronic statistical marker with limited standalone effect.
What is the function of the DENND1A gene?
The DENND1A gene encodes a protein involved in endosomal trafficking and membrane receptor recycling. In ovarian theca cells, specific isoforms of the protein play an active role in regulating steroidogenesis and excess androgen production.
Why do different studies show conflicting results for rs2479102?
Genetic studies often yield variable results due to differences in linkage disequilibrium patterns across ancestral populations, sample sizes, and diagnostic criteria for PCOS. In many cases, rs2479102 may simply tag a broader genomic region rather than acting as the functional causal variant itself.
Can a genetic test for rs2479102 replace a clinical evaluation for PCOS?
No, clinical diagnosis of PCOS relies on established clinical frameworks like the Rotterdam criteria, which require evaluating symptoms such as irregular ovulation, clinical or biochemical hyperandrogenism, and ovarian morphology via ultrasound. Direct consumer genetic tests cannot diagnose PCOS.
Sources & further reading
Educational information only, last refreshed 9/11/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Prominent susceptibility locus within DENND1A linked across global GWAS cohorts to ovarian theca cell hyperfunction, hyperandrogenism, and polycystic ovary syndrome (PCOS).
Intronic DENND1A variant strongly implicated in altered theca cell androgen biosynthesis and increased risk for polycystic ovary syndrome.