JHY rs11605693: Pubertal Timing & Age at Menarche
Single-nucleotide polymorphism rs11605693 is a common genetic variant located downstream of the JHY gene on chromosome 11. Genome-wide association research has linked this variant to subtle shifts in female pubertal timing, specifically age at menarche. Its individual biological impact is small and represents just one minor component within a highly polygenic trait influenced heavily by lifestyle and environment.
What each genotype means
Typical menarche timing
You carry two copies of the major T allele at the JHY locus. In population-level association studies, this baseline genotype is correlated with standard timing for age at menarche without the slight delay linked to the minor allele. Because pubertal timing is polygenic and shaped heavily by environmental and nutritional factors, this single marker contributes only a modest effect.
Found in approximately 50% to 60% of East Asian individuals and common across diverse global populations.
Mildly later menarche tendency
You carry one copy of the minor C allele at the rs11605693 marker near JHY. Large-scale genetic studies in East Asian female cohorts link each copy of the C allele to a minor statistical increase in age at menarche, corresponding to slightly later pubertal timing. However, this is a limited statistical correlation rather than a clinical outcome, and pubertal development is influenced by hundreds of genes along with lifestyle and health factors.
Carried by approximately 35% to 45% of individuals of East Asian ancestry, with variable prevalence worldwide.
Modestly later menarche tendency
You carry two copies of the minor C allele at the JHY locus. In published genome-wide association studies, this genotype shows the strongest additive association with slightly delayed onset of female menarche relative to the baseline. Evidence remains limited primarily to East Asian cohorts, and the overall biological effect of this single variant on pubertal timing is small.
Carried by roughly 5% to 10% of individuals in East Asian populations; less common in groups where the C allele frequency is lower.
Genomic Context and the JHY Locus
The variant rs11605693 is a non-coding single-nucleotide polymorphism situated downstream of the JHY (junctional cadherin complex regulator) gene on chromosome 11. In standard genomic reference builds, it represents a single base transition, typically characterized by alleles C and T. Because it resides in an intergenic or flanking regulatory space rather than within an exon, it does not alter an amino acid sequence directly. Instead, research indicates that rs11605693 acts as an expression quantitative trait locus (eQTL), meaning it is statistically correlated with differences in the transcript expression levels of neighboring genes, including JHY itself, across tissues such as subcutaneous adipose tissue, the tibial nerve, and the testes. This positional context suggests that any physiological consequences stem from regulatory fine-tuning rather than loss of protein function.
Biological Function of JHY
The JHY gene encodes a protein that participates in fundamental cellular processes, including motile cilium assembly, cerebrospinal fluid dynamics, and the establishment of planar cell polarity. In animal models, disruptions to Jhy have been implicated in developmental pathways affecting ventricular systems in the brain. Motile cilia and neurodevelopmental signaling structures play key roles during mammalian development, which provides a plausible biological rationale for why variants in this genomic neighborhood might interface with the neuroendocrine pathways regulating pubertal maturation. However, while the neurobiology of the hypothalamic-pituitary-gonadal (HPG) axis governs pubertal activation, the exact functional mechanism through which altered JHY expression downstream influences menarche timing remains under active investigation and requires deeper functional validation.
Association with Age at Menarche
Age at menarche—the timing of a female's first menstrual period—is a complex physiological trait governed by hundreds of loci acting in concert with metabolic and environmental cues. Genome-wide association studies (GWAS), notably in East Asian cohorts such as the Korean Genome and Epidemiology Study (KoGES) and BioBank Japan, identified rs11605693 as a locus associated with pubertal timing. In these studies, carrying the minor C allele was linked to a slight delay in menarche, with an effect size (beta) of roughly 0.05 to 0.08 years per allele. Because this single marker accounts for only a tiny fraction of a year's difference, the current clinical evidence strength for rs11605693 as an independent predictive marker is classified as limited. It serves as a population-level signal rather than a deterministic biological driver.
Ancestry and Population Diversity
The frequency of the rs11605693 alleles varies across global ancestries, demonstrating why genetic background is an essential consideration when evaluating statistical associations. In East Asian populations, where the primary discovery and replication efforts achieved statistical significance, the minor C allele occurs at a frequency roughly between 0.20 and 0.35. In contrast, frequency distributions across African, European, and Indigenous American populations vary, and linkage disequilibrium patterns can differ significantly across ancestries. Because most strong statistical validation for rs11605693 comes from East Asian cohorts, the association may not transfer directly to other ancestries without formal multi-ethnic fine-mapping, highlighting an ongoing need for diverse cohort representation in human reproductive genetics.
Interpreting Your Genetic Data
Discovering your rs11605693 genotype provides an interesting glimpse into the polygenic architecture of human maturation, but it cannot be used to make clinical predictions or diagnostic evaluations. Pubertal onset is heavily shaped by non-genetic factors, such as childhood nutrition, body mass index, physical activity levels, stress, and broader environmental conditions. A few weeks' difference in statistical probability at one locus does not dictate personal reproductive health, fertility outcomes, or the onset of puberty. Individuals with concerns regarding pubertal delay, early menarche, or hormonal irregularities should consult a qualified physician or pediatric endocrinologist for standard clinical evaluation rather than relying on direct-to-consumer genetic markers.
How common is this variant?
The minor C allele frequency ranges between approximately 0.20 and 0.35 in East Asian populations, while presenting at variable frequencies across other ancestral backgrounds.
Frequently asked questions
Can rs11605693 predict the exact year a girl will start her period?
No. The variant rs11605693 only accounts for a statistical difference of a few weeks in population studies. Individual pubertal timing is polygenic and dominated by environmental factors, body mass index, and overall childhood health.
Does having the rs11605693 CC genotype cause delayed puberty or amenorrhea?
No, rs11605693 does not cause clinical disorders such as delayed puberty or primary amenorrhea. The tiny shifts observed in research studies are completely within normal, healthy ranges of pubertal development.
What role does the JHY gene play in reproductive health?
The JHY gene is primarily known for producing a protein involved in ciliary assembly, brain development, and fluid movement. While rs11605693 alters JHY gene expression in some tissues, its exact biological mechanism in hormonal timing is still being actively researched.
Are results for rs11605693 applicable to people of all ancestral backgrounds?
Not necessarily. Most genome-wide significant associations for rs11605693 have been documented in East Asian cohorts, and allele frequencies as well as linkage disequilibrium patterns differ widely across populations.
Sources & further reading
Educational information only, last refreshed 9/12/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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