SERPINA6 rs2736898: What Your Genotype Means
The rs2736898 variant is a common genetic polymorphism located within the SERPINA6 gene region. Research suggests this variant is associated with the regulation of morning plasma cortisol levels and has been studied for its potential influence on anxiety phenotypes and cardiovascular health.
What each genotype means
Typical cortisol regulation
This genotype is associated with baseline levels of corticosteroid-binding globulin (CBG) expression in the liver. Research indicates that variants in this region influence how cortisol is transported and delivered to tissues, which may play a role in stress response and anxiety susceptibility. Please discuss any concerns regarding stress or anxiety with your healthcare provider.
This is a common genotype found in many global populations.
Typical cortisol regulation
This genotype is associated with baseline levels of corticosteroid-binding globulin (CBG) expression in the liver. Research indicates that variants in this region influence how cortisol is transported and delivered to tissues, which may play a role in stress response and anxiety susceptibility. Please discuss any concerns regarding stress or anxiety with your healthcare provider.
This is a common genotype found in many global populations.
Altered cortisol regulation
This genotype is linked to variations in SERPINA6 gene expression, which influences the production of corticosteroid-binding globulin (CBG) and the bioavailability of cortisol. Studies suggest that these genetic differences may contribute to individual variations in stress response and anxiety levels. Please discuss any concerns regarding stress or anxiety with your healthcare provider.
This is a common genotype found in many global populations.
Understanding the rs2736898 Variant
The rs2736898 variant is a single nucleotide polymorphism (SNP) situated on chromosome 14 within a genomic region that encompasses both the SERPINA6 and SERPINA1 genes. In genomics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant has been identified through genome-wide association studies (GWAS) as a significant marker for morning plasma cortisol levels. Scientists often use such variants as 'instrumental variables' in Mendelian randomization studies, a statistical method that helps determine whether a specific biomarker, like cortisol, has a causal relationship with health outcomes. Because this region influences how the body manages cortisol bioavailability, rs2736898 serves as a useful tool for researchers investigating the complex interplay between stress hormones and various physiological or psychological traits.
The Role of the SERPINA6 Gene
The SERPINA6 gene provides instructions for producing a protein called corticosteroid-binding globulin (CBG). CBG acts as the primary transport protein for cortisol in the bloodstream. Cortisol is a vital hormone involved in many bodily functions, including the regulation of blood glucose, the suppression of inflammation, and the body's response to stress. Under normal conditions, CBG binds to cortisol, rendering it inactive while it is being transported. When the body requires cortisol, CBG releases it to specific tissues where it becomes active. Genetic variations in the SERPINA6 region can influence the expression of this protein in the liver, which in turn affects the total amount of cortisol circulating in the blood. By modulating CBG levels, these genetic factors play a fundamental role in determining how much cortisol is available for the body to use at any given time.
Research Associations and Evidence Strength
Current research into rs2736898 provides moderate evidence regarding its physiological associations. Mendelian randomization studies have linked genetically predicted plasma cortisol levels—influenced by variants in the SERPINA6/SERPINA1 region—to an increased risk of hypertension and higher systolic blood pressure. Furthermore, some studies have observed a statistical association between these genetic instruments and anxiety phenotypes in large cohorts like the UK Biobank. However, it is important to note that these findings are based on statistical correlations across large populations rather than direct clinical causation in individuals. While the evidence suggests a link between this genetic locus and cortisol-related traits, researchers have not found consistent evidence linking these specific variants to major depression or neuroticism. The field continues to evolve, and these associations remain a subject of active scientific investigation.
Population Frequency and Interpretation
The rs2736898 variant is considered a common polymorphism, meaning it is frequently observed across diverse human populations. Because it is common, many individuals carry one or more copies of the variant alleles. When interpreting genetic data, it is crucial to understand that having a specific genotype does not equate to a medical diagnosis or a guaranteed health outcome. Genetic markers like rs2736898 represent only one small piece of a much larger puzzle that includes environmental factors, lifestyle, and the influence of thousands of other genes. This information is intended for educational purposes to help you understand the current state of genomic research. It should not be used to make personal health decisions. If you have concerns about your stress levels, blood pressure, or mental health, please consult with a qualified healthcare professional who can provide personalized medical advice.
How common is this variant?
The rs2736898 variant is a common polymorphism found across various global populations, with its specific genotype frequencies varying by ancestry.
Frequently asked questions
Does my rs2736898 genotype mean I have high cortisol?
No. This variant is associated with statistical trends in cortisol regulation across large populations, but it cannot predict your individual cortisol levels. Many factors, including stress, sleep, and diet, have a much larger impact on your actual hormone levels than this single genetic variant.
Can I use this information to diagnose an anxiety disorder?
Absolutely not. Genetic variants are not diagnostic tools for mental health conditions. Anxiety is a complex condition influenced by many biological and environmental factors, and this SNP should never be used to infer a medical diagnosis.
Should I change my medication based on this result?
No. You should never alter your medication or treatment plan based on genetic information without first consulting your doctor or pharmacist. Always discuss any concerns about your health or medications with a qualified healthcare provider.
Is this variant linked to heart disease?
Some research has used this genetic region to study the relationship between cortisol and cardiovascular health, finding associations with blood pressure. However, these are population-level statistical associations and do not mean that carrying this variant will cause heart disease in an individual.
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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This variant in the SERPINA6 gene region influences cortisol bioavailability and is associated with anxiety risk in Mendelian randomization studies.
Functional missense polymorphism altering corticosteroid-binding globulin affinity, impacting morning awakeness and baseline cortisol dynamics.