ABO rs687621: What Your Genotype Means for Longevity
The rs687621 variant is a single nucleotide polymorphism located within the ABO gene, which is best known for determining human blood types. Research has identified this specific variant as being associated with healthy longevity and favorable aging profiles in various populations.
What each genotype means
Associated with healthy longevity
Research indicates that the G allele at this position is associated with healthy aging profiles. Individuals carrying the GG genotype have shown a positive statistical association with healthy longevity and specific metabolic markers, including normal BMI levels and certain lipid profiles, in large-scale population studies. This association is based on statistical trends and does not predict individual health outcomes.
This genotype is common, though exact frequencies vary significantly across different global ancestral populations.
Potential longevity-associated profile
The CG genotype contains one copy of the G allele, which has been identified in research as a variant associated with healthy longevity. While the association is most pronounced in those with the GG genotype, carriers of the CG genotype may share some of the observed statistical trends related to healthy aging and metabolic markers. These findings are based on population-level data and should not be used to infer personal health status.
This is a common genotype found in many populations worldwide.
Baseline longevity profile
The CC genotype represents the alternative state at this variant site, which does not carry the G allele associated with the longevity signals observed in specific studies. Research suggests that individuals with this genotype do not exhibit the same statistical associations with healthy aging markers as those carrying the G allele. This is a common genetic variation and is not considered a marker of disease.
This genotype is frequently observed across diverse ancestral groups.
Understanding the rs687621 Variant
The rs687621 variant is a specific change in the DNA sequence located on chromosome 9 within the ABO gene. In genomics, a single nucleotide polymorphism, or SNP, represents a variation at a single position in the DNA chain. This particular SNP is situated in a region of the genome that influences the expression and function of the ABO blood group system. Because it is a common variant, many individuals carry one of the possible allele combinations. Scientists study these variations to understand how subtle differences in our genetic code might contribute to complex traits like lifespan and the ability to maintain health into older age. By mapping these positions, researchers can identify patterns that appear more frequently in individuals who reach advanced ages compared to the general population.
The Role of the ABO Gene
The ABO gene provides instructions for making enzymes that determine your ABO blood type. These enzymes modify the sugar molecules on the surface of red blood cells, creating the A, B, or O antigens. Beyond blood typing, the ABO gene is involved in various physiological processes, including the regulation of certain proteins in the blood that affect clotting and inflammation. Because these processes are linked to cardiovascular health and immune function, the ABO gene has become a subject of interest in longevity research. Variations in this gene may influence how the body manages systemic inflammation or blood viscosity, both of which are critical factors in maintaining health as the body ages. Understanding the ABO gene's broader role helps explain why specific variants within it might be associated with different health outcomes.
Evidence and Longevity Associations
Scientific research, including genome-wide association studies, has identified rs687621 as a marker associated with healthy longevity. Studies have observed that certain alleles of this SNP appear at higher frequencies in long-lived individuals compared to control groups. While the evidence is considered moderate, it suggests that the ABO locus plays a role in the complex genetic architecture of human aging. It is important to note that longevity is a polygenic trait, meaning it is influenced by hundreds or thousands of genetic variants, as well as environmental factors like diet, lifestyle, and access to healthcare. Therefore, while rs687621 is statistically linked to longevity in some studies, it is not a deterministic factor. The association highlights the importance of the ABO gene in biological aging, but it does not guarantee any specific health outcome for an individual.
Population Frequency and Distribution
The rs687621 variant is considered common across diverse human populations. Because it is a widespread genetic marker, the distribution of the C and G alleles varies significantly depending on ancestral background. In many global cohorts, the frequency of these alleles is well-documented in databases like gnomAD, which aggregate genomic data from thousands of individuals. This high frequency allows researchers to conduct large-scale studies to confirm associations with health traits. However, the impact of a variant can sometimes differ between populations due to the surrounding genetic context, known as linkage disequilibrium. This means that while the variant is common, its association with longevity might be more pronounced in some ancestral groups than in others. Researchers continue to analyze these differences to build a more comprehensive understanding of how genetic diversity influences human healthspan.
Interpreting Your Genetic Information
If you have access to your genetic data, you may see rs687621 listed with your specific genotype. It is essential to understand that this information is for educational purposes and should not be used to predict your personal health future or diagnose any condition. Genetic associations are based on statistical trends observed in large groups of people, not individual predictions. You cannot change your genotype, but you can focus on well-established lifestyle factors that support healthy aging, such as regular physical activity, a balanced diet, and routine medical screenings. If you have concerns about your health or family history, the best course of action is to consult with a healthcare professional or a genetic counselor. They can provide context based on your complete medical history, which is far more informative than any single genetic variant.
How common is this variant?
The rs687621 variant is common across global populations, with allele frequencies varying by ancestry. It is widely represented in major genomic databases, reflecting its status as a common polymorphism.
Frequently asked questions
Does having the 'favorable' genotype guarantee a long life?
No. Longevity is influenced by a complex combination of genetics, environment, and lifestyle. A single genetic variant only provides a very small piece of the puzzle and does not determine your lifespan.
Can I change my genotype for rs687621?
No, your genotype is determined at conception and remains the same throughout your life. You cannot alter your DNA sequence, but you can influence your health through lifestyle choices.
Is rs687621 a diagnostic test for aging?
No. This variant is used in research to study population-level trends. It is not a clinical diagnostic tool and cannot predict how you will age or your risk for specific diseases.
Where can I learn more about my own genetic data?
If you have taken a direct-to-consumer genetic test, you can often download your raw data. However, you should discuss any findings with a qualified healthcare provider or genetic counselor to understand their relevance to your health.
Sources & further reading
Educational information only, last refreshed 9/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Variant in the ABO blood group locus associated with plasma alkaline phosphatase levels and blood group determination.
A missense variant (Leu266Met) in the ABO gene that, in combination with other SNPs, determines ABO blood group status and is associated with cardiovascular and metabolic traits.
A common variant in the ABO blood group locus robustly associated with circulating levels of soluble adhesion molecules (sICAM-1) and venous thromboembolism risk.
Located near the ABO locus and associated in GWAS with circulating lipid levels and markers of cardiovascular disease risk.
This single nucleotide polymorphism in the ABO locus is strongly associated with circulating E-selectin, soluble ICAM-1 levels, and thrombosis risk.
Tagging variant in ABO associated with blood group phenotypes and longevity.