LHCGR rs121912659: Understanding Rare Reproductive Variants
The rs121912659 variant is a rare genetic alteration located within the LHCGR gene. It is associated with recessive loss-of-function effects that can impact reproductive development and hormonal signaling.
What each genotype means
Typical LHCGR function
This genotype represents the common, functional version of the LHCGR gene. Individuals with this profile possess the standard genetic sequence required for normal luteinizing hormone receptor signaling, which is essential for typical reproductive development and function.
This is the most common genotype found in the general population across all ancestries.
Carrier of LHCGR variant
This genotype indicates you carry one copy of the pathogenic variant associated with LHCGR-related reproductive conditions. Because this condition is inherited in an autosomal recessive manner, carriers typically do not exhibit the primary clinical symptoms, though they should discuss reproductive implications with a genetic counselor.
This genotype is extremely rare in the general population.
LHCGR loss-of-function
This genotype indicates the presence of two copies of the pathogenic variant, which results in a loss of function of the luteinizing hormone receptor. Research associates this profile with conditions such as primary amenorrhea, lack of secondary sexual characteristics, or disorders of sex development, depending on the individual's biological sex and clinical context.
This genotype is ultra-rare and is typically only identified in clinical settings involving individuals with specific reproductive or developmental symptoms.
What is the rs121912659 Variant?
The rs121912659 variant is a specific single nucleotide polymorphism (SNP) found within the LHCGR gene. In genetics, a SNP represents a variation at a single position in the DNA sequence. This particular variant is categorized as a loss-of-function mutation, meaning it disrupts the normal activity of the protein the gene is responsible for creating. Because this variant is recessive, an individual typically needs to inherit two copies of the altered gene—one from each parent—to potentially experience the associated clinical features. It is important to note that genetic variants are common in the human population, but those that significantly alter protein function, like this one, are often much rarer.
The Role of the LHCGR Gene
The LHCGR gene provides the essential instructions for building the luteinizing hormone/chorionic gonadotropin receptor. This receptor protein is found on the surface of specific cells in the reproductive system, including the ovaries in females and the Leydig cells in the testes of males. Its primary job is to receive signals from luteinizing hormone and human chorionic gonadotropin, which are critical for regulating reproductive processes. These signals are necessary for the production of sex hormones like testosterone and for the maturation of eggs. When the LHCGR gene is functioning correctly, it ensures that these hormonal pathways remain balanced and responsive to the body's needs throughout development and adulthood.
Research and Clinical Associations
Scientific research has linked inactivating variants in the LHCGR gene to various reproductive health conditions. In females, these variants have been associated with primary amenorrhea, which is the absence of menstruation by the expected age, and a lack of secondary sexual characteristics. In males, loss-of-function variants can lead to Leydig cell hypoplasia, a condition that affects the development of external genitalia and hormonal balance. The evidence for these associations is considered moderate to strong in clinical literature, as documented in various case studies and systematic reviews. Because this variant is classified as pathogenic in databases like ClinVar, it is recognized by the medical community as a significant factor in specific disorders of sexual development.
Population Frequency and Interpretation
The rs121912659 variant is classified as ultra-rare in the general population. Because it is so uncommon, it is not typically found in standard population screening panels. Most individuals will not carry this variant, and even among those who do, the clinical impact depends heavily on whether they have inherited one or two copies. If you have received information about this variant from a genetic test, it is essential to understand that this is not a diagnosis. Genetic data should always be interpreted by a qualified healthcare professional, such as a genetic counselor or a reproductive endocrinologist, who can place the findings in the context of your personal and family medical history.
Managing Genetic Information
If you are concerned about your genetic results, the most important step is to consult with a clinician. A doctor can help determine if further testing is necessary or if the variant is relevant to your specific health situation. You cannot change your genetic code, but understanding it can help you and your medical team make informed decisions about your reproductive health. Avoid making medical decisions based solely on online reports or raw data files. Always rely on the guidance of a licensed medical provider who can offer personalized advice, explain the implications of your results, and discuss any potential next steps for your care.
How common is this variant?
The rs121912659 variant is ultra-rare across all major global populations, making it an uncommon finding in standard genetic testing.
Frequently asked questions
What does it mean if I have a pathogenic LHCGR variant?
A pathogenic variant means that the specific change in your DNA is known to disrupt the function of the LHCGR gene. You should discuss this result with a genetic counselor or a specialist to understand what it means for your health.
Can I fix a mutation in the LHCGR gene?
Currently, there is no medical procedure to 'fix' or edit a genetic variant in your DNA. Medical management focuses on treating the symptoms or hormonal imbalances that may arise from the variant's effect on the body.
Is this variant the same as a diagnosis?
No, identifying a genetic variant is not the same as a clinical diagnosis. A diagnosis requires a physical examination, hormonal testing, and a review of your medical history by a qualified healthcare provider.
Should I be worried if I am a carrier?
Being a carrier for a recessive condition usually means you do not have the condition yourself. However, it is helpful to discuss your carrier status with a genetic counselor, especially if you are planning to start a family.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Intronic regulatory variant in LHCGR modulating luteinizing hormone and human chorionic gonadotropin signaling sensitivity during human folliculogenesis.
Polymorphism in the luteinizing hormone/choriogonadotropin receptor gene linked to variation in ovarian sensitivity to gonadotropins during assisted reproduction.
A missense polymorphism (N291S) in the luteinizing hormone/choriogonadotropin receptor gene that influences receptor signaling efficiency and sensitivity to exogenous gonadotropins in ovarian stimulation protocols.
Regulatory SNP in LHCGR associated with ovarian responsiveness.
Luteinizing hormone/choriogonadotropin receptor gene locus polymorphism linked to polycystic ovary syndrome susceptibility.
Intronic regulatory variant in LHCGR modulating luteinizing hormone and human chorionic gonadotropin signaling, linked to susceptibility to polycystic ovary syndrome (PCOS).