GNRHR rs193922615: Genetic Insight and Reproductive Health
The genetic variant rs193922615 represents a rare missense substitution located within the GNRHR gene on chromosome 4. It has been documented in clinical and reproductive genetics research in connection with normosmic congenital hypogonadotropic hypogonadism (nIHH). Disruptions in this gene can impair normal gonadotropin-releasing hormone signaling, affecting pubertal development and reproductive hormone production.
What each genotype means
Typical GNRHR function
You carry two copies of the common reference allele for the GNRHR gene at this position. This genotype is associated with normal gonadotropin-releasing hormone receptor signaling and typical pubertal development. It does not carry the elevated risk for congenital hypogonadotropic hypogonadism linked to the rare missense variant.
Carried by more than 99.9% of individuals across all global populations.
Carrier of rare variant
You carry one copy of the rare pathogenic missense allele in the GNRHR gene. GNRHR-related congenital hypogonadotropic hypogonadism typically follows an autosomal recessive pattern of inheritance, meaning a single altered copy generally does not cause clinical symptoms on its own. However, carrying this variant means you could potentially pass it to biological offspring or have reproductive implications if paired with another altered allele.
Extremely rare, found in approximately 1 in 2,500 individuals of Non-Finnish European descent (allele frequency ~0.0002) and even less frequently in other ancestries.
High risk of hypogonadotropic hypogonadism
You carry two copies of the rare missense substitution in the GNRHR gene. Biallelic loss-of-function variants in GNRHR are strongly linked in clinical research to normosmic congenital hypogonadotropic hypogonadism, which can impair gonadotropin secretion and pubertal development. If you are experiencing symptoms or have family planning questions, a consultation with a clinical geneticist or endocrinologist can help contextualize your endocrine health.
Exceedingly rare in the general population, with an expected prevalence of fewer than 1 in several million individuals globally.
Genomic Location and Variant Characteristics
The single nucleotide polymorphism rs193922615 is situated within the human GNRHR gene on chromosome 4q13.2. As recorded in databases such as dbSNP and ClinVar, this variant represents a missense substitution that alters the primary amino acid sequence of the encoded receptor protein. Missense variants in coding regions can potentially modify protein folding, alter surface receptor stability, or interrupt critical binding interactions. In the context of rs193922615, the altered nucleotide sequence is evaluated for its potential to disturb normal molecular behavior, although population databases classify it as an extremely rare event across general community cohorts.
The Biological Function of the GNRHR Gene
The GNRHR gene provides instructions for making the gonadotropin-releasing hormone receptor, a seven-transmembrane G-protein coupled receptor predominantly expressed on the surface of pituitary gonadotrope cells. Under healthy physiological conditions, the hypothalamic peptide gonadotropin-releasing hormone (GnRH) binds to this receptor, initiating an intracellular signaling cascade. This biochemical trigger stimulates the synthesis and pulsatile secretion of two crucial reproductive hormones: luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Together, LH and FSH govern the production of sex steroids in the gonads and regulate gametogenesis, playing an essential role in sexual maturation and fertility.
Research Associations and Normosmic Hypogonadotropic Hypogonadism
In scientific literature, pathogenic variations in GNRHR are a recognized cause of normosmic congenital hypogonadotropic hypogonadism (nIHH). Unlike Kallmann syndrome, which involves an impaired sense of smell due to defective olfactory axon migration, nIHH typically presents with normal olfaction alongside delayed, absent, or incomplete pubertal development and reduced circulating sex steroids. Inherited typically in an autosomal recessive or oligogenic pattern, severe receptor dysfunction usually requires biallelic mutations—either homozygous or compound heterozygous—to produce full clinical manifestation. However, the direct evidence base specifically evaluating rs193922615 remains classified as limited due to scarce individual case reports and restricted functional validation.
Population Frequency and Ancestry Considerations
According to broad population genomic resources such as the Genome Aggregation Database (gnomAD), rs193922615 is exceptionally uncommon worldwide. The minor allele frequency in Non-Finnish European populations is approximately 0.0002, and it is observed at similarly vanishing or absent frequencies in other continental ancestry groups. Because severe Mendelian conditions linked to GNRHR are rare, disease-causing alleles are generally held at very low frequencies by purifying natural selection. The extreme scarcity of the minor allele means that homozygous individuals are rarely encountered outside consanguineous pedigrees or multi-variant clinical cohorts.
Understanding Your Genetic Data in Context
Identifying a rare variant such as rs193922615 on a genetic panel provides biological data, but it cannot be treated as a definitive medical diagnosis. Because hypogonadotropic hypogonadism linked to GNRHR generally follows an autosomal recessive inheritance model, carrying a single copy of an atypical allele is frequently asymptomatic without a second pathogenic mutation. Genetic testing interpretation requires careful synthesis with clinical history, endocrine profiling, and physical evaluations. Anyone with concerns regarding pubertal delay, hormonal imbalances, or reproductive fertility should consult an endocrinologist or certified genetic counselor for formal evaluation.
How common is this variant?
The rs193922615 alternative allele is extremely rare in general population databases, with an allele frequency of approximately 0.0002 in Non-Finnish Europeans in gnomAD and near-zero detection across most other ancestral groups.
Frequently asked questions
What is normosmic congenital hypogonadotropic hypogonadism?
Normosmic congenital hypogonadotropic hypogonadism (nIHH) is a hormonal condition characterized by deficient production of sex hormones and delayed or absent puberty, occurring alongside a completely normal sense of smell. It differs from Kallmann syndrome, which features hypogonadism combined with an impaired or absent sense of smell.
Does carrying a single copy of rs193922615 cause infertility?
Generally, no. GNRHR-associated hypogonadotropic hypogonadism typically follows an autosomal recessive pattern, meaning an individual usually requires two altered alleles (either homozygous or compound heterozygous) to cause noticeable endocrine deficits. Heterozygous carriers usually experience normal pubertal development and fertility.
How common is rs193922615 across different populations?
The variant is exceedingly rare in the general public. Large-scale sequencing databases such as gnomAD record its frequency at approximately 0.02% (0.0002) in Non-Finnish Europeans, with similarly negligible frequencies observed in other global ancestral backgrounds.
What should I do if a commercial DNA test shows a variant in GNRHR?
Commercial consumer genotyping arrays can occasionally produce false-positive calls on rare genetic variants. If you or a family member have symptoms related to delayed puberty or hormonal concerns, you should review the data with an endocrinologist or genetic counselor who can order diagnostic clinical-grade sequencing.
Sources & further reading
Educational information only, last refreshed 9/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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