ADRB2 rs2267735: Stress Response & Receptor Expression
The genetic variant rs2267735 is a single nucleotide polymorphism located in the region of the ADRB2 gene, which encodes the human beta-2 adrenergic receptor. Research associates this variant with subtle variations in autonomic stress reactivity, receptor expression, and cardiovascular responses to physical or psychological stress. However, published clinical evidence remains limited, and it does not serve as a diagnostic marker for any medical condition.
What each genotype means
| Genotype | What the research suggests | Reading |
|---|---|---|
| CC | Homozygous for the C allele. In candidate-gene investigations of autonomic function, this genotype is evaluated for baseline adrenergic receptor density and standard physiological recovery following acute stress protocols. | Informational |
| CT | Heterozygous carrying one C allele and one T allele. Individuals with this genotype possess intermediate expression dynamics in observational research, displaying typical cardiovascular reactivity to adrenergic stimulation. | Informational |
| TT | Homozygous for the T allele. Some exploratory studies investigate whether this genotype correlates with slight shifts in receptor downregulation or cardiovascular reactivity under physical or psychosocial strain, though evidence remains limited. | Informational |
Genetic Location and Molecular Characteristics
The single nucleotide polymorphism rs2267735 is located within the chromosomal region housing the ADRB2 gene on chromosome 5. The ADRB2 gene encodes the beta-2 adrenergic receptor, a classical G protein-coupled receptor integral to autonomic nervous system signaling. At the DNA level, this polymorphism involves a base substitution that commonly alternates between a reference allele and an alternative allele across global populations. Because of its genomic location near regulatory regions, researchers have evaluated rs2267735 primarily for its potential role in modulating transcriptional efficiency and messenger RNA stability rather than causing a missense change in the final protein structure. In genetic association studies, rs2267735 is frequently analyzed alongside other well-known functional ADRB2 variants to assess linkage disequilibrium and evaluate composite haplotype effects on receptor density.
The Biological Role of ADRB2 in the Stress Response
The beta-2 adrenergic receptor plays a fundamental role in the human sympathetic nervous system's 'fight-or-flight' response. When the body encounters physical exertion, mental arousal, or psychological threat, the adrenal medulla and sympathetic nerve terminals release the catecholamines epinephrine and norepinephrine. These chemical messengers bind to beta-2 adrenergic receptors located in vascular smooth muscle, bronchial tissue, the heart, and metabolic organs. Receptor activation initiates intracellular cyclic adenosine monophosphate (cAMP) cascades, leading to physiological changes such as bronchodilation, vasodilation of skeletal muscle beds, and altered cardiac output. Variation in the genes governing these receptors, including ADRB2, can theoretically influence how rapidly receptors desensitize or downregulate after agonist exposure, leading to modest population-level variations in autonomic recovery and cardiovascular reactivity.
Current Scientific Evidence and Clinical Strength
The current clinical and epidemiological evidence linking rs2267735 directly to distinct physiological stress reactivity profiles remains categorized as limited. While early candidate-gene investigations observed statistical correlations between specific alleles of rs2267735 and differences in blood pressure surges, heart rate variability, or post-stress autonomic recovery, large-scale genome-wide association studies (GWAS) often show modest effect sizes that can vary across cohorts. Furthermore, many studies examining adrenergic signaling evaluate multi-SNP haplotypes—such as combinations involving the well-characterized Arg16Gly and Gln27Glu polymorphisms—rather than rs2267735 in isolation. In the broader literature, confusion sometimes arises because certain behavioral and stress-pathway studies examine different candidate receptors, underscoring that candidate-gene findings require rigorous replication in diverse, prospective cohorts before drawing firm clinical conclusions.
Interpreting Your Genetic Data Responsibly
Discovering your rs2267735 genotype on a consumer genetic test provides educational context about common human variation rather than a clinical prognosis. This SNP does not diagnose cardiovascular disease, anxiety disorders, hypertension, or autonomic dysfunction. Polygenic architecture, lifestyle factors, physical fitness, personal background, and overall health status exert far greater influence on how an individual experiences and manages acute stress than any single genetic variant. If you are reviewing genetic data in the context of cardiovascular medications—such as beta-blockers or beta-agonist inhalers—never alter, begin, or discontinue prescription regimens based on genetic reports. Always discuss any questions regarding medication dosing, autonomic symptoms, or stress management directly with a licensed clinician or pharmacist.
How common is this variant?
The minor allele frequency for rs2267735 generally ranges between 0.38 and 0.44 across multi-ancestry populations, indicating that heterozygous and homozygous genotypes are commonly distributed worldwide.
Frequently asked questions
What does the rs2267735 variant do in the body?
The rs2267735 variant is a single nucleotide polymorphism in the ADRB2 region, which codes for the beta-2 adrenergic receptor. Scientists study it to see whether small variations in DNA sequence influence how receptors respond to epinephrine and manage autonomic cardiovascular reactivity during stress.
Does having a specific rs2267735 genotype mean I will experience high stress or anxiety?
No, carrying a specific genotype at rs2267735 does not determine your stress levels or cause anxiety disorders. The scientific evidence connecting this individual SNP to overall stress phenotypes is limited, and psychological well-being is shaped by complex genetic networks, environmental conditions, and lifestyle factors.
Should I change my beta-blocker or asthma inhaler dosage based on this SNP?
No, you should never adjust prescription medication regimens based on direct-to-consumer genetic variants. While ADRB2 is an important pharmacogene, current clinical guidelines do not recommend dosing changes based solely on rs2267735; any medication concerns must be reviewed with your doctor or pharmacist.
How common is the rs2267735 variant across different populations?
The minor allele occurs at an estimated frequency of approximately 38% to 44% across diverse global ancestral groups. Because it is so widespread, both heterozygous and homozygous genotypes are commonly observed in the general population.
Sources & further reading
Educational information only, last refreshed 9/5/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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