CRHR1 rs110402: Understanding Stress Response Genetics
The rs110402 variant is a single nucleotide polymorphism located within the CRHR1 gene, which encodes a receptor critical for the body's stress response system. Research suggests this variant may influence how individuals process stress, regulate cortisol levels, and respond to emotional stimuli.
What each genotype means
Potential stress resilience
Research suggests that individuals with this genotype may show a protective effect against the development of depression following childhood adversity. Studies have also linked this genotype to lower peak cortisol responses during psychosocial stress tasks compared to those carrying the G allele. These findings are based on statistical associations in specific study populations and do not predict individual outcomes.
The frequency of this genotype varies by ancestry, but it is generally considered the minor genotype in many populations.
Intermediate stress response
This genotype represents a combination of the protective A allele and the common G allele. Research indicates that individuals with this profile may exhibit intermediate physiological responses to stress compared to those who are homozygous for either allele. As with all genetic associations, these results reflect population-level trends rather than individual certainty.
This is a common heterozygous genotype found across many global populations.
Potential stress vulnerability
This genotype is often identified as the major allele and has been associated in some studies with increased vulnerability to stress-related psychopathology and higher cortisol reactivity. Research suggests that individuals with this genotype may be more sensitive to the effects of early-life stress on HPA-axis function and emotional processing. These associations are complex and influenced by environmental factors; they are not diagnostic of any health condition.
This is the most common genotype for this variant in many populations worldwide.
What is the rs110402 Variant?
The rs110402 variant is a specific genetic change, or single nucleotide polymorphism (SNP), located in the second intron of the CRHR1 gene. Introns are non-coding regions of DNA that sit between the coding sequences of a gene. While they do not provide the direct instructions for building a protein, they often play essential roles in regulating how genes are expressed or "turned on" and "turned off" within cells. Because rs110402 is located in this regulatory region, scientists have investigated whether it alters the production or function of the CRHR1 receptor. This variant is frequently studied in the context of the hypothalamic-pituitary-adrenal (HPA) axis, the body's primary system for managing stress. By examining this specific location on chromosome 17, researchers aim to understand if subtle differences in DNA sequence contribute to the wide variation in how people physiologically and behaviorally react to stressful life events.
The Role of the CRHR1 Gene
The CRHR1 gene provides instructions for creating the corticotropin-releasing hormone receptor 1. This receptor is a G-protein coupled receptor found throughout the brain and body. It acts as a key "docking station" for corticotropin-releasing hormone (CRH), a neuropeptide that serves as the master switch for the body's stress response. When CRH binds to the CRHR1 receptor, it triggers a cascade of signals that eventually leads to the release of cortisol, the body's primary stress hormone. This system is vital for survival, as it helps the body mobilize energy and focus during immediate threats. However, if this system is overactive or dysregulated, it can contribute to anxiety, mood disorders, and difficulties in recovering from stress. Because CRHR1 is central to this pathway, variations in the gene are of significant interest to researchers studying the biological underpinnings of stress-related conditions and emotional regulation.
Research Associations and Evidence Strength
Scientific evidence linking rs110402 to specific health outcomes is currently considered limited and preliminary. Several studies have observed that this variant may influence cortisol responses to acute psychosocial stress, with some data suggesting that certain genotypes are associated with different patterns of brain activity in regions involved in emotional processing. Other research has explored whether rs110402 interacts with environmental factors, such as childhood trauma or work-related stress, to influence mental health outcomes or cognitive performance. However, these findings are often based on small sample sizes and have not always been consistently replicated across different populations. It is important to note that while these associations are statistically significant in specific studies, they do not establish a direct cause-and-effect relationship. The scientific community views these results as exploratory, meaning more large-scale, diverse research is required to confirm the clinical relevance of this variant.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs110402 represent only a tiny fraction of the factors that influence human health and behavior. Stress response is a complex trait shaped by a combination of thousands of genetic variants, environmental exposures, life experiences, and psychological factors. Having a particular genotype for rs110402 does not mean an individual will have a specific stress response or develop a particular condition. This information is intended for educational purposes and should not be used to make medical decisions or self-diagnose. If you are concerned about your stress levels, mental health, or how you respond to challenging situations, the most effective approach is to consult with a qualified healthcare professional. They can provide personalized guidance based on your full medical history and current symptoms, rather than relying on isolated genetic data that lacks clinical validation.
How common is this variant?
There is no standardized, globally recorded population frequency for the rs110402 variant in major public databases. Frequency data is often specific to the cohorts used in individual research studies.
Frequently asked questions
Does the rs110402 variant cause anxiety?
No, this variant does not cause anxiety. While some research suggests it may be associated with how individuals process stress, anxiety is a complex condition influenced by many genetic, environmental, and psychological factors.
Can I use this SNP to predict my stress response?
No, you cannot use this SNP to predict your stress response. Genetic markers like rs110402 provide only a very small piece of a much larger puzzle and are not currently used for clinical prediction.
Is rs110402 a diagnostic test for mental health?
No, rs110402 is not a diagnostic test. Mental health conditions are diagnosed by clinicians based on clinical interviews, symptoms, and history, not by genetic testing of single variants.
Should I change my lifestyle based on this genotype?
You should not change your lifestyle based on this genotype. Any decisions regarding your health or wellness should be discussed with a healthcare provider who can evaluate your overall health status.
Sources & further reading
Educational information only, last refreshed 10/7/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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HPA-axis modulating variant in CRHR1 that interacts with psychosocial stress exposure to affect emotional reactivity and stress-coping traits.
Key intronic polymorphism in the corticotropin-releasing hormone receptor 1 gene that moderates endocrine and emotional vulnerability after exposure to early life trauma.
Polymorphism within the CRHR1 locus tagged to haplotypes modulating cortisol release during the Trier Social Stress Test.
Variant in the corticotropin-releasing hormone receptor 1 gene that moderates hypothalamic-pituitary-adrenal axis reactivity and vulnerability to stress-induced mood disturbances.
Intronic CRHR1 variant associated with neuroendocrine stress sensitivity.
Tag variant in the CRHR1 locus associated with HPA axis regulation.