ESR1 rs13277013: Timing of Menarche and Menopause
The genetic variant rs13277013 is a single nucleotide polymorphism located in an intronic region of the ESR1 gene on chromosome 6. Research has identified it as a marker associated with subtle population-level differences in reproductive milestones, including the timing of menarche and age at natural menopause. Because this variant resides in non-coding DNA and has limited overall effect sizes, it represents a minor statistical contributor rather than a direct predictor of individual reproductive timelines.
What each genotype means
Typical reproductive timing
You carry two copies of the C allele at this ESR1 locus, which is the more common baseline genotype. Genome-wide association studies have evaluated this intronic variant for subtle variations in female reproductive milestones, such as timing of menarche or natural menopause, but evidence remains limited and shows minimal individual phenotypic effect. Having this genotype is generally associated with typical, population-average reproductive timing without strong predisposition to early or delayed onset.
Carried by approximately 40% to 45% of individuals of European ancestry, and common across other global populations.
Intermediate reproductive timing profile
You have one copy of the C allele and one copy of the T minor allele at this intronic ESR1 site. Genetic association studies indicate limited and modest statistical correlations between this variant and the timing of reproductive events, including age at menarche or natural menopause. Because this variant exerts only a very small influence among many interacting genetic and environmental factors, carrying one T allele does not reliably predict noticeable differences in your reproductive lifespan.
Found in roughly 45% of individuals of European ancestry, representing the most common heterozygous group in populations where the minor allele frequency is around 35%.
Slight variation in reproductive milestones
You carry two copies of the minor T allele at this ESR1 locus. Published genome-wide association research has explored links between this genotype and slight shifts in the timing of menarche or natural menopause; however, existing scientific evidence is considered limited and effect sizes are very small. Carrying two copies of this variant does not indicate a reproductive disorder or determine your specific reproductive timeline, which is shaped by complex genetic networks and lifestyle factors.
Carried by approximately 10% to 15% of people of European ancestry, based on a minor allele frequency of about 0.35 in gnomAD.
Understanding rs13277013 and the ESR1 Gene
The rs13277013 variant represents a single nucleotide change located within an intron of the estrogen receptor 1 gene, known as ESR1, situated on chromosome 6. ESR1 encodes estrogen receptor alpha (ER-alpha), a nuclear transcription factor that binds estrogenic hormones and regulates gene expression throughout female reproductive development, bone homeostasis, cardiovascular physiology, and metabolic regulation. Because rs13277013 is situated within non-protein-coding intronic sequence, it does not alter the amino acid sequence of the estrogen receptor itself. Instead, genetic variants in these non-coding areas frequently act as regulatory markers that may subtly modulate transcription efficiency, alternative splicing, or serve as statistical proxies for other tightly linked functional sequence variants through linkage disequilibrium across the chromosome.
Research on Reproductive Milestones and Evidence Strength
Large-scale genome-wide association studies (GWAS) exploring reproductive aging have repeatedly highlighted loci across the ESR1 chromosomal region. Statistical analyses have correlated rs13277013 with minor shifts in the onset of menarche (the start of menstrual periods) and the timing of natural menopause. However, scientific evidence supporting this individual SNP remains categorized as limited. The associated effect sizes observed in study cohorts are exceptionally subtle, typically corresponding to shifts in reproductive milestones measured in weeks or months rather than distinct years. Complex traits such as menstrual onset and ovarian reserve depletion are governed by hundreds of polygenic loci operating alongside substantial nutritional, socioeconomic, and lifestyle factors.
Population Frequency and Global Distribution
Data from large genomic aggregation cohorts, including gnomAD and the 1000 Genomes Project, demonstrate that rs13277013 is a common human polymorphism rather than a rare pathogenic mutation. In populations of European ancestry, the minor allele maintains a frequency of approximately 0.35, making both heterozygous and homozygous variant genotypes common across healthy populations. Because allele distributions fluctuate between global ancestral groups, the statistical associations reported in predominantly European-ancestry cohorts cannot be directly applied across all ethnic backgrounds without careful validation. This underscores the necessity of considering multi-ancestry datasets when evaluating polygenic reproductive signals.
What This Information Means for You
Knowing your genotype at rs13277013 does not provide a definitive timetable for puberty, menstrual health, or the onset of menopause. Complex reproductive traits are influenced by extensive networks of common variants as well as broad lifestyle and environmental inputs such as physical activity, childhood nutrition, smoking status, and overall metabolic health. An individual genotype at a single intronic locus cannot diagnose reproductive disorders, assess fertility reserves, or predict individual health outcomes. If you have questions regarding menstrual irregularity, family planning, or menopausal symptoms, you should discuss them directly with your qualified healthcare provider rather than relying on consumer genetic markers.
How common is this variant?
The minor allele occurs at an estimated frequency of approximately 0.35 in European populations according to gnomAD datasets, with frequencies varying modestly across other ancestral groups.
Frequently asked questions
Can rs13277013 tell me when I will reach menopause?
No. While research studies observe small statistical associations between this variant and the average age at natural menopause in large cohorts, the individual effect size is far too small to predict your personal timeline.
Does having the minor allele cause fertility problems?
No. The rs13277013 variant is a common intronic polymorphism found in millions of healthy individuals and has not been established as a causal factor for infertility or reproductive dysfunction.
Why is the evidence for rs13277013 considered limited?
The evidence is considered limited because individual non-coding SNPs like rs13277013 contribute only fractional differences to complex traits and often serve merely as markers linked to other functional changes in the genomic region.
Does rs13277013 alter how my body responds to estrogen therapy?
There are currently no approved clinical guidelines or CPIC recommendations linking rs13277013 to estrogen therapy dosing or hormone replacement responses. Always consult your prescribing physician or pharmacist about hormone therapies.
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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This variant in the estrogen receptor 1 gene is associated with human reproductive behavior and influences estrogen-responsive gene expression.
This variant in the estrogen receptor 1 gene is associated with an increased risk of endometriosis and may influence cognitive aging.
Estrogen receptor 1 variant associated with altered circulating estradiol levels, follicular maturation, and variability in age at natural menopause.
Variant in estrogen receptor 1 associated with variation in female reproductive timing, including age at menarche and natural menopause onset.
Common polymorphism in estrogen receptor alpha (ESR1) affecting target tissue responsiveness to estrogen, recurrent pregnancy loss risk, and bone-reproductive axis interactions.
Estrogen receptor 1 regulatory variant associated with variation in timing of menarche and bone density response to sex hormones.