LHB rs1057519741: Understanding This Rare Genetic Variant
The rs1057519741 variant is a rare genetic change located within the LHB gene, which provides instructions for creating the beta subunit of luteinizing hormone. This variant is categorized as an inactivating missense mutation and has been associated with hypogonadism and impaired gonadal steroidogenesis.
What each genotype means
Typical luteinizing hormone function
You carry two copies of the standard C allele for the LHB gene. Research indicates this genotype is associated with typical synthesis and function of the luteinizing hormone beta subunit. Individuals with this common genotype are not expected to have an increased genetic risk for isolated luteinizing hormone deficiency from this variant.
Carried by more than 99.9% of individuals across all major global populations.
Carrier of rare inactivating variant
You carry one copy of the rare T missense variant alongside one functional copy of the LHB gene. Because LHB-related isolated hypogonadotropic hypogonadism follows an autosomal recessive inheritance pattern, heterozygous carriers typically produce sufficient functional luteinizing hormone and remain asymptomatic. Evidence regarding subtle reproductive effects in single-copy carriers remains limited.
Extremely rare; observed in fewer than 1 in 10,000 individuals globally in population reference databases such as gnomAD.
Isolated luteinizing hormone deficiency risk
You carry two copies of the rare T variant in the LHB gene. In published medical genetics literature, homozygous inactivation of LHB is associated with isolated luteinizing hormone deficiency, which can result in delayed puberty, hypogonadism, and impaired gonadal steroidogenesis. Anyone with concerns about hormone levels or pubertal development should consult an endocrinologist or medical geneticist for specialized evaluation.
Exceedingly rare globally, documented primarily in isolated clinical case reports and consanguineous pedigrees.
What is the rs1057519741 Variant?
The rs1057519741 variant is a specific single nucleotide polymorphism (SNP) found within the LHB gene. In genetics, a missense mutation occurs when a change in a single DNA building block results in the production of a different amino acid in the final protein. Because this specific variant is described as an inactivating mutation, it is believed to interfere with the normal function of the protein it encodes. This variant is located on chromosome 19, which is the site of the LHB gene. Understanding the location and nature of such variants is a primary focus of clinical genetics, as it helps researchers determine how specific changes in the genetic code might disrupt biological processes. Because this variant is extremely rare, it is not typically included in standard commercial genetic screening panels.
The Role of the LHB Gene
The LHB gene encodes the beta subunit of luteinizing hormone (LH). Luteinizing hormone is a critical glycoprotein hormone produced by the pituitary gland that plays a central role in the reproductive system. In both men and women, LH is essential for normal gonadal function. In men, it stimulates the Leydig cells in the testes to produce testosterone. In women, it is involved in the regulation of the menstrual cycle and the stimulation of ovulation. Because the LHB protein must combine with another subunit to form a functional hormone, any mutation that alters the structure of the beta subunit can potentially impair the hormone's ability to signal effectively. When LH signaling is disrupted, it can lead to a condition known as hypogonadism, where the sex glands produce little or no sex hormones, potentially affecting fertility and pubertal development.
Research and Clinical Associations
Research into LHB variants has established that mutations in this gene can lead to selective luteinizing hormone deficiency. Clinical studies have documented that individuals with certain inactivating mutations in LHB may present with symptoms of hypogonadism, such as delayed puberty, infertility, or secondary amenorrhea. The evidence for the clinical impact of rs1057519741 is currently classified as limited. While the biological mechanism—inactivating the hormone subunit—is well-understood in the context of the LHB gene, the specific clinical outcomes for individuals carrying this exact variant require further study. It is important to note that genetic associations are complex; the presence of a variant does not guarantee a specific health outcome, as other genetic and environmental factors often play a significant role in how a condition manifests in an individual.
Population Frequency and Interpretation
According to large-scale genomic databases like gnomAD, the rs1057519741 variant is extremely rare. In population genetics, 'rare' typically means that the variant is found in a very small percentage of the population, often making it difficult to conduct large-scale statistical studies to determine its exact impact. Because it is so uncommon, there is limited data regarding its distribution across different ancestral groups. When a variant is this rare, it is often identified in clinical settings through targeted testing for individuals who are already experiencing symptoms of hypogonadism, rather than through population-wide screening. If you have received information about this variant from a genetic test, it is essential to discuss the findings with a qualified healthcare provider or a genetic counselor. They can help interpret the results in the context of your personal and family medical history.
How common is this variant?
The rs1057519741 variant is extremely rare in the general population, as noted in gnomAD, making it an uncommon finding in standard genomic datasets.
Frequently asked questions
What is the LHB gene?
The LHB gene provides the instructions for making the beta subunit of luteinizing hormone, a hormone essential for reproductive health and the production of sex hormones.
What does it mean if I have a rare LHB variant?
Finding a rare variant does not necessarily mean you have a medical condition. You should consult with a doctor or genetic counselor to understand what this result means for your specific health profile.
Is this variant associated with infertility?
Some mutations in the LHB gene are associated with hypogonadism, which can impact fertility. However, the clinical impact of this specific variant is limited and requires professional medical evaluation.
Should I be worried about my LHB genotype?
Genetic variants are only one part of your overall health. If you are concerned about reproductive health or hormone levels, speak with an endocrinologist who can order appropriate clinical tests.
Sources & further reading
Educational information only, last refreshed 10/11/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic variant in the luteinizing hormone beta subunit gene associated with hypogonadotropic hypogonadism and infertility due to selective LH deficiency.
A 3-prime UTR single-nucleotide polymorphism in luteinizing hormone subunit beta that influences transcriptional regulation and luteal phase steroidogenesis.