LDLR rs121918407: Understanding This Genetic Variant
The rs121918407 variant is a specific change located within the LDLR gene, which plays a critical role in how the body processes cholesterol. This variant is recognized in clinical research for its association with elevated levels of low-density lipoprotein (LDL) cholesterol.
What each genotype means
Potential cholesterol risk
This genotype is associated with the LDLR gene, which plays a critical role in regulating cholesterol levels. Research indicates that certain variants in this gene can contribute to familial hypercholesterolemia, a condition characterized by elevated LDL cholesterol; please consult with a healthcare provider to discuss your lipid profile and cardiovascular health.
This specific genotype is considered rare in the general population.
Potential cholesterol risk
This genotype involves one copy of the variant associated with the LDLR gene, which is involved in cholesterol metabolism. Because this variant is linked to potential elevations in LDL cholesterol, it is important to discuss these findings with a clinician to determine if further screening or monitoring is appropriate for your health.
This specific genotype is considered rare in the general population.
Typical genetic profile
This genotype represents the common or reference state for this specific location in the LDLR gene. It is not associated with the specific clinical risks linked to the variant form of this gene, though overall cholesterol levels are influenced by many genetic and lifestyle factors.
This is the most common genotype observed in the general population.
What is the rs121918407 Variant?
The rs121918407 variant is a specific genetic alteration identified within the LDLR gene. In genomics, an rsID (reference SNP cluster ID) acts as a unique identifier for a specific location in the human genome where a variation has been observed. This particular variant is categorized as a trait-associated marker. When researchers study such variants, they look at how the specific sequence change might influence the structure or function of the protein encoded by the gene. Because this variant is located in the LDLR gene, it is of particular interest to scientists studying lipid metabolism and cardiovascular health. It is important to note that the presence of a variant does not automatically imply a specific health outcome, but rather serves as a point of study for its potential impact on biological processes.
The Role of the LDLR Gene
The LDLR gene provides the essential instructions for creating the low-density lipoprotein receptor protein. These receptors are located on the surface of cells, particularly in the liver, and act like docking stations for LDL particles circulating in the bloodstream. By binding to these LDL particles, the receptors facilitate their removal from the blood and into the cells, where the cholesterol can be processed or recycled. This process is vital for maintaining healthy cholesterol levels in the blood. When the LDLR gene contains variants that disrupt the production or function of these receptors, the body's ability to clear LDL cholesterol is impaired. This can lead to higher concentrations of cholesterol remaining in the blood, a condition often investigated in the context of familial hypercholesterolemia.
Research and Evidence Strength
Current research classifies the evidence for the association between rs121918407 and cholesterol-related traits as moderate. Scientific studies, including those cataloged in databases like ClinVar and the GWAS Catalog, examine how such variants correlate with clinical phenotypes like high LDL cholesterol. While many variants in the LDLR gene are well-documented drivers of lipid disorders, the functional impact of every specific variant can vary. Researchers use both population-based association studies and functional laboratory assays to determine if a variant significantly alters receptor activity. Because the evidence for this specific variant is considered moderate, it remains a subject of ongoing investigation. Scientists continue to refine our understanding of how this specific genetic change influences the efficiency of LDL uptake compared to the standard, or reference, genetic sequence.
Population Frequency
The rs121918407 variant is classified as rare across global populations. In genetic research, a variant is typically considered rare if it appears in a very small percentage of the individuals sampled in large-scale genomic databases like gnomAD. Because it is rare, it is not commonly found in the general population, which often makes it more challenging to conduct large-scale statistical studies on its specific effects. The rarity of this variant is consistent with many pathogenic variants associated with inherited lipid disorders, which are often maintained at low frequencies in the gene pool. Researchers monitor these frequencies to better understand the distribution of genetic traits across different ancestral backgrounds and to improve the accuracy of genetic risk assessments.
Interpreting Genetic Information
Understanding your genetic information is a complex process that should always be approached with the guidance of a qualified healthcare professional. While genetic variants like rs121918407 provide insights into biological predispositions, they are only one piece of a much larger puzzle that includes diet, lifestyle, and other genetic factors. You cannot use this information to self-diagnose or make independent medical decisions. If you have concerns about your cholesterol levels or family history, it is essential to discuss these findings with a doctor or a genetic counselor. They can help interpret what these results mean in the context of your overall health and determine if any clinical testing or management strategies are appropriate for your specific situation.
How common is this variant?
The rs121918407 variant is rare, appearing at a very low frequency across diverse ancestral populations in global genomic databases.
Frequently asked questions
What does it mean if I have the rs121918407 variant?
Having this variant means you carry a specific change in your LDLR gene. Because this gene is involved in cholesterol regulation, it is a subject of research regarding lipid levels, but it does not provide a medical diagnosis on its own.
Is rs121918407 the same as familial hypercholesterolemia?
No, the variant is a genetic marker that researchers study in the context of cholesterol metabolism. Familial hypercholesterolemia is a clinical diagnosis made by a doctor based on blood tests, family history, and physical exams.
Should I change my diet if I have this variant?
You should not make changes to your diet or health regimen based solely on a genetic variant. Always consult with your physician or a registered dietitian to create a health plan tailored to your specific clinical needs.
Where can I find more information about LDLR variants?
You can explore resources like MedlinePlus Genetics or the NCBI ClinVar database for general information on the LDLR gene. These sites provide educational summaries on how genes influence health and disease.
Sources & further reading
Educational information only, last refreshed 10/2/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic missense variant altering low-density lipoprotein receptor function and predisposing to severe familial hypercholesterolemia.
This pathogenic variant in the LDLR gene is a contributor to familial hypercholesterolemia, leading to significantly elevated LDL cholesterol levels.
Variant in the LDLR 3' UTR region associated with statin efficacy, often studied in East Asian cohorts.
A variant in the 3' UTR of the LDLR gene associated with variations in statin therapeutic response.
Synonymous variant in the LDLR gene associated with plasma LDL cholesterol levels.
This variant is a well-established marker associated with LDL cholesterol levels and risk of coronary artery disease.