GRID2 rs77534195: Understanding This Reproductive Health Variant
The rs77534195 variant is a single nucleotide polymorphism located within the GRID2 gene. Recent research has identified a statistical association between this specific genetic marker and cases of azoospermia and severe oligozoospermia in certain male populations.
What each genotype means
Potential reproductive health association
This genotype has been identified in research involving a cohort of Greek males as being associated with an increased risk of azoospermia and severe oligozoospermia. Because this is an intronic variant, its exact biological mechanism remains under investigation, and these findings should be interpreted with caution as they may not apply to all populations.
The specific frequency of this genotype is not currently well-documented in global population databases.
Potential reproductive health association
This genotype has been identified in research involving a cohort of Greek males as being associated with an increased risk of azoospermia and severe oligozoospermia. Because this is an intronic variant, its exact biological mechanism remains under investigation, and these findings should be interpreted with caution as they may not apply to all populations.
The specific frequency of this genotype is not currently well-documented in global population databases.
Potential reproductive health association
This genotype has been identified in research involving a cohort of Greek males as being associated with an increased risk of azoospermia and severe oligozoospermia. Because this is an intronic variant, its exact biological mechanism remains under investigation, and these findings should be interpreted with caution as they may not apply to all populations.
The specific frequency of this genotype is not currently well-documented in global population databases.
What is rs77534195?
The identifier rs77534195 refers to a specific location in the human genome where a single nucleotide change can occur. This variant is situated within an intronic region of the GRID2 gene. Introns are non-coding segments of DNA that lie between the exons, which are the parts of the gene that provide instructions for building proteins. While intronic variants do not directly alter the amino acid sequence of a protein, they can sometimes influence how a gene is regulated, spliced, or expressed. Scientists track these variants using 'rs' numbers, which act as unique labels in global databases like dbSNP, allowing researchers to consistently refer to the same genomic position across different studies and populations.
The Role of the GRID2 Gene
The GRID2 gene provides instructions for producing a protein known as the glutamate delta-2 receptor (GluD2). This protein is primarily recognized for its role in the nervous system, where it functions as a subunit of ionotropic glutamate receptors. These receptors are critical for synaptic plasticity, which is the ability of connections between neurons to strengthen or weaken over time, a process fundamental to learning and memory. While the gene is most famous for its neurological functions, researchers are increasingly investigating its expression in other tissues. The presence of GRID2-related variants in studies of reproductive health suggests that the gene's influence may extend beyond the brain, potentially playing a role in complex biological processes related to spermatogenesis.
Research and Evidence Strength
The association between rs77534195 and male reproductive health is based on findings from a genome-wide association study (GWAS) conducted on a cohort of Greek males. This study identified the variant while investigating the genetic architecture of azoospermia (the absence of sperm in ejaculate) and severe oligozoospermia (a very low sperm count). The evidence for this association is currently classified as moderate. It is important to note that GWAS findings represent statistical correlations rather than direct causation. Because this research was conducted in a specific population, it is not yet clear if the same association holds true across diverse global ancestries. Further replication studies in larger, more diverse cohorts are necessary to confirm the strength and generalizability of this genetic link.
Interpreting Your Genetic Information
If you encounter this variant in your genetic data, it is essential to understand that it is not a diagnostic tool. The presence of a specific genotype does not mean an individual will experience reproductive health issues, nor does its absence guarantee fertility. Genetic variants often act as small pieces of a much larger puzzle involving environmental factors, lifestyle, and other genetic interactions. You cannot use this information to self-diagnose or predict medical outcomes. If you have concerns regarding reproductive health or fertility, the most appropriate step is to consult with a qualified healthcare provider or a reproductive specialist. They can provide personalized medical advice, order appropriate clinical testing, and help you interpret your health status in the context of your overall medical history.
How common is this variant?
Specific population frequency data for rs77534195 is not widely documented in major public databases, and the variant was identified in a specific study of Greek males.
Frequently asked questions
Is rs77534195 a cause of infertility?
No, rs77534195 is a genetic variant associated with certain reproductive conditions in a specific study, but it is not considered a direct cause of infertility. Genetic associations are statistical findings and do not imply that the variant alone determines reproductive health.
Should I be worried if I have the G allele?
Genetic variants are common and often have no impact on your health. You should not be worried based on a single variant; instead, focus on your overall health and consult a doctor if you have specific concerns about your fertility.
Where can I get tested for this variant?
This variant is typically identified through research-grade genome-wide association studies rather than standard clinical diagnostic tests. If you are concerned about fertility, speak with a reproductive endocrinologist or urologist who can order clinically validated tests.
Does this variant affect my brain health?
While the GRID2 gene is primarily known for its role in the brain, the association of rs77534195 is specific to reproductive health research. There is no current evidence suggesting this specific intronic variant impacts neurological function.
Sources & further reading
Educational information only, last refreshed 10/27/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs77534195?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29