ANXA5 rs62319820: Understanding the Promoter Variant
The rs62319820 variant is a single nucleotide polymorphism located in the promoter region of the ANXA5 gene. It is frequently studied as part of a haplotype structure that researchers have investigated for potential links to deep vein thrombosis and pregnancy-related complications.
What each genotype means
Typical ANXA5 promoter activity
This genotype represents the most common form of the ANXA5 promoter region. Research indicates that individuals with this genotype do not carry the specific promoter variations associated with reduced Annexin A5 protein expression, which has been studied in the context of pregnancy outcomes.
This is the most prevalent genotype observed across major global populations.
Potential reduced promoter activity
This genotype includes one copy of the variant allele, which is part of a broader promoter haplotype that may influence the transcriptional activity of the ANXA5 gene. While some studies have explored links between these promoter haplotypes and pregnancy-related complications, results remain inconsistent and are not considered a definitive diagnostic marker for thrombosis or pregnancy loss.
This genotype is common, appearing in a significant portion of individuals across European and East Asian populations.
Reduced promoter activity profile
Carrying two copies of this variant allele is associated with the M2 haplotype, which has been shown in some research to reduce the transcriptional activity of the ANXA5 gene. While some studies suggest this may be a risk factor for recurrent pregnancy loss, other research has found no significant association with venous thrombosis, and clinical evidence remains mixed. If you are concerned about pregnancy outcomes or clotting risks, please discuss these findings with your clinician.
This genotype is less common than the C/C or C/T genotypes but is still found at measurable frequencies in many populations.
What is rs62319820?
The rs62319820 variant is a specific genetic change located in the promoter region of the ANXA5 gene. In genetics, a promoter is a regulatory sequence of DNA that acts like a switch, determining when and how much of a protein is produced by a gene. Because rs62319820 sits in this control area, scientists have hypothesized that it might influence the expression levels of the Annexin A5 protein. This variant is often analyzed alongside other nearby SNPs to define specific 'haplotypes'—groups of genetic markers that are inherited together. By studying these patterns, researchers aim to understand if certain combinations of variants lead to functional differences in how the body manages blood coagulation and cellular repair processes.
The Role of the ANXA5 Gene
The ANXA5 gene provides instructions for creating the Annexin A5 protein. This protein is well-known for its ability to bind to phosphatidylserine, a type of lipid found on the surface of cell membranes. By coating these surfaces, Annexin A5 acts as a natural anticoagulant, shielding them from coagulation complexes that would otherwise trigger blood clotting. Beyond its role in the blood, Annexin A5 is highly expressed in the placenta, where it is thought to help maintain a healthy environment for pregnancy. Recent research also suggests that Annexin A5 may function as a cell membrane repair protein, helping to reseal tears in cell membranes and potentially reducing inflammation in tissues like the lining of blood vessels.
Research and Evidence Strength
The association between ANXA5 variants and clinical conditions like deep vein thrombosis (DVT) or recurrent pregnancy loss remains a subject of active scientific debate. While some early studies suggested that specific ANXA5 promoter haplotypes might reduce protein expression and increase the risk of thrombosis, subsequent larger studies have often failed to replicate these findings. For instance, research investigating pregnancy-related venous thrombosis has reported no convincing association between these genetic variants and the condition. Because the evidence is mixed and often contradictory across different populations, the clinical significance of rs62319820 is currently considered to be of moderate or uncertain strength. It is important to recognize that genetic associations are statistical observations and do not necessarily imply a direct cause-and-effect relationship in every individual.
Population Frequency
The ANXA5 promoter variants, including those associated with the M2 haplotype, are common across many global populations. Studies have shown that these variants are prevalent in European, East Asian, and Southeast Asian populations, with minor allele frequencies often ranging from 8% to over 20% depending on the specific ancestry. Because these variants are relatively common in the general population, they are considered part of normal human genetic diversity rather than rare mutations. There is no single 'risk' frequency, as the prevalence varies significantly by geographic and ethnic background. Researchers continue to use large-scale genomic databases to better map how these frequencies differ across the globe, which helps in understanding whether findings from one study population can be applied to others.
What This Information Means for You
If you have received information about your rs62319820 genotype, it is important to view it in the context of current scientific uncertainty. Because the link between this variant and health outcomes like thrombosis is not definitively established, this genetic marker is not used as a standard diagnostic tool in clinical medicine. Genetic testing results should never be used to self-diagnose or to make changes to your medical care. If you have concerns about your risk for blood clots, pregnancy complications, or other cardiovascular issues, please consult with a qualified healthcare provider or a genetic counselor. They can evaluate your personal and family medical history, which are far more predictive of health outcomes than a single genetic variant. Always discuss any questions about your health or potential treatments with your clinician.
How common is this variant?
The rs62319820 variant is a common polymorphism found across diverse global populations, with frequencies varying significantly by ancestry.
Frequently asked questions
Is rs62319820 a cause of blood clots?
Current research is inconsistent, and there is no definitive evidence that rs62319820 directly causes blood clots. While some studies have explored this link, many others have found no significant association.
Should I get tested for ANXA5 variants?
Routine testing for ANXA5 variants is not recommended by medical organizations. Because the clinical impact is not well-established, these results are generally not useful for making medical decisions.
Does this variant affect pregnancy?
Some researchers have investigated whether ANXA5 promoter variants contribute to pregnancy complications, but results have been mixed. It is not currently used as a standard screening tool for pregnancy health.
Can I change my risk if I have this variant?
Because the association between this variant and health conditions is not proven, there are no specific lifestyle or medical changes recommended based on this genotype. Focus on established health factors like maintaining a healthy weight and staying active.
Sources & further reading
Educational information only, last refreshed 10/30/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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