GRM8 rs117923405: Understanding This Rare Genetic Variant
The rs117923405 variant is a rare genetic change located within the GRM8 gene. It has been identified in research as being associated with specific metabolic phenotypes that may indirectly influence physical appearance traits.
What each genotype means
Typical metabolic profile
This genotype represents the most common form of this variant in the general population. Research indicates this variant is associated with metabolic traits, but this specific genotype does not carry the rare allele linked to those observations. This information is for educational purposes and does not constitute a medical diagnosis.
This is the most frequent genotype observed across global populations.
Rare variant carrier
You carry one copy of the rare allele associated with this GRM8 variant. Large-scale studies have linked this variant to metabolic phenotypes, though the exact biological mechanism remains a subject of ongoing research. Please consult with a healthcare professional if you have concerns regarding your metabolic health.
This genotype is rare and found in a very small percentage of the global population.
Rare variant homozygous
You carry two copies of the rare allele associated with this GRM8 variant. While this variant has been identified in GWAS studies as having potential links to metabolic traits, the evidence is moderate and the clinical significance for an individual is not fully established. This result should not be used for medical decision-making.
This genotype is extremely rare across all studied ancestral groups.
What is rs117923405?
The rs117923405 variant is a single nucleotide polymorphism (SNP), which is a variation at a single position in the DNA sequence. This specific variant is located within the GRM8 gene, which provides instructions for making a protein called metabotropic glutamate receptor 8. In the context of genomics, SNPs like rs117923405 are often studied to understand how small differences in our genetic code contribute to biological diversity and susceptibility to various traits. Because this variant is classified as rare, it is not found in the majority of the human population. Researchers track these variants to determine if they correlate with observable differences in health or physical characteristics. It is important to note that the presence of a SNP does not guarantee the development of any specific trait, as most human characteristics are influenced by a complex interplay of multiple genes, environmental factors, and lifestyle choices.
The Role of the GRM8 Gene
The GRM8 gene encodes the metabotropic glutamate receptor 8 protein, which is primarily expressed in the central nervous system. This receptor plays a critical role in signal transduction, specifically by responding to glutamate, a major neurotransmitter in the brain. By inhibiting adenylate cyclase activity through G-protein signaling, the GRM8 protein helps regulate the transmission of nerve impulses. Beyond its neurological functions, research has indicated that GRM8 expression is also detected in other tissues, including the male reproductive system. Because glutamate signaling is fundamental to many physiological processes, variations in the GRM8 gene are of significant interest to scientists studying neurological health, behavioral patterns, and metabolic regulation. Understanding how this gene functions provides the necessary context for why researchers investigate variants like rs117923405 in relation to broader metabolic and physical phenotypes.
Research Associations and Evidence
Current research into rs117923405 suggests a link to metabolic phenotypes that may indirectly affect physical appearance. The evidence strength for this association is currently considered moderate. In the field of genomics, a moderate evidence rating typically means that while statistical signals have been observed in studies, more research is required to fully establish the biological mechanism and confirm the consistency of the association across diverse populations. It is essential to distinguish between a statistical correlation and a direct cause-and-effect relationship. Many genetic variants identified in large-scale studies serve as markers that point toward broader biological pathways rather than acting as direct determinants of a trait. As with all genetic research, findings are often based on population-level data, and individual outcomes can vary significantly. Scientists continue to use tools like the GWAS Catalog to refine these associations as more data becomes available.
Population Frequency
The rs117923405 variant is characterized as rare across global populations. In genetic studies, a variant is generally considered rare if its minor allele frequency is very low, often below 1% in the general population. Because of this low frequency, it can be challenging to conduct large-scale studies that provide definitive conclusions about the variant's impact. Data from large-scale genomic databases, such as gnomAD, are typically used to estimate how often this variant appears in different ancestral groups. Because the variant is rare, it may be absent or extremely uncommon in many cohorts, which contributes to the current uncertainty regarding its precise phenotypic effects. Researchers rely on these frequency charts to ensure that their studies are adequately powered to detect potential associations, and the rarity of rs117923405 underscores the need for continued collaborative research across diverse global populations.
What You Can Do With This Information
Information regarding genetic variants like rs117923405 is primarily intended for educational and research purposes. It is important to understand that this data cannot be used to diagnose medical conditions or predict personal health outcomes with certainty. If you have received information about your genetic profile, it is best to view it as one small piece of a much larger biological puzzle. You cannot change your genetic sequence, but you can focus on evidence-based lifestyle choices, such as maintaining a balanced diet and regular physical activity, which are known to have a significant impact on metabolic health. If you have specific concerns about your health or metabolic traits, the most appropriate course of action is to consult with a qualified healthcare professional or a genetic counselor. They can help you interpret your health data in the context of your personal and family medical history.
How common is this variant?
The rs117923405 variant is classified as rare, appearing at a very low frequency across most global populations.
Frequently asked questions
Is rs117923405 a cause of metabolic disease?
No, rs117923405 is a genetic variant associated with metabolic phenotypes, but it is not a direct cause of disease. Genetic associations are statistical links, and most metabolic traits are influenced by many genes and environmental factors.
Can I change my GRM8 genotype?
No, your genetic sequence is determined at conception and cannot be changed. However, you can manage your health through lifestyle choices like diet and exercise, which influence how your genes are expressed.
Where can I find more information on GRM8?
You can find authoritative information on the GRM8 gene through resources like the National Center for Biotechnology Information (NCBI) Gene database or GeneCards. These platforms provide detailed summaries of gene function and associated research.
Should I be worried if I have the rare allele?
Having a rare allele is not necessarily a cause for concern. Many rare variants have no known clinical impact, and genetic associations are often complex and require professional interpretation in the context of your overall health.
Sources & further reading
Educational information only, last refreshed 9/16/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the GRM8 gene has been identified through GWAS as having a potential association with metabolic traits that can influence overall physical constitution.
A genetic variant in GRM8 associated with phenotypic variations in metabolic health and body composition.