HTR1A rs6295: Understanding the Serotonin Receptor Variant
The rs6295 variant is a single nucleotide polymorphism located in the promoter region of the HTR1A gene, which encodes the serotonin 1A receptor. This genetic variation is associated with differences in how the receptor is expressed, potentially influencing individual stress responses and mood regulation.
What each genotype means
Typical Serotonin Receptor Regulation
You carry two copies of the C allele at the promoter variant historically known as C(-1019)G. Research indicates this genotype permits normal binding of transcription factors that repress serotonin 1A autoreceptor expression in raphe neurons, supporting typical serotonergic signaling during stress. Population studies have generally associated the CC genotype with lower vulnerability to stress-induced anxiety traits and standard antidepressant response rates, though overall clinical evidence remains modest and non-diagnostic.
Carried by approximately 25% to 30% of individuals of European ancestry and roughly 40% to 50% of East Asian populations.
Intermediate Stress Sensitivity
You carry one copy of the C allele and one copy of the G allele. The G allele is linked to disrupted repressor protein binding, which may lead to higher autoreceptor levels and modestly attenuated serotonin transmission during stress. Published research shows mixed results, with some cohorts observing intermediate susceptibility to stress-related mood changes and slight differences in SSRI response; any questions regarding antidepressant medications should always be discussed directly with your healthcare provider or pharmacist.
Carried by approximately 45% to 50% of people of European ancestry and about 40% to 45% of East Asian individuals.
Elevated Stress Reactivity Risk
You carry two copies of the G allele for this regulatory variant. Published studies have associated this genotype with impaired transcriptional repression, potentially leading to increased 5-HT1A autoreceptor expression, reduced serotonin release, and heightened sensitivity to negative life events or threat cues. Findings across psychiatric and antidepressant treatment studies remain heterogeneous and limited, so you should speak with your physician or pharmacist regarding any personal mental health questions or medication choices.
Carried by roughly 20% to 25% of individuals of European ancestry and less than 15% of East Asian populations.
What is the rs6295 Variant?
The rs6295 variant, often referred to as the C(-1019)G polymorphism, is a specific change in the DNA sequence within the promoter region of the HTR1A gene. A promoter region acts as a control switch for a gene, determining how much of a protein is produced. In the case of rs6295, the presence of either a Cytosine (C) or a Guanine (G) nucleotide at this position can alter the binding affinity of transcription factors. These proteins normally bind to the DNA to regulate gene expression. Research indicates that the G-allele may impair the binding of certain transcriptional repressors, such as NUDR (also known as DEAF-1), which normally acts to inhibit the expression of the HTR1A gene. Consequently, this variant is thought to influence the density and activity of serotonin 1A receptors in various regions of the brain, including the raphe nuclei, hippocampus, and cortex.
The Role of the HTR1A Gene
The HTR1A gene provides instructions for creating the serotonin 1A receptor, a G protein-coupled receptor that responds to the neurotransmitter serotonin. This receptor is critical for maintaining the balance of the serotonergic system, which regulates mood, emotion, and stress responses. It functions in two primary ways: as an autoreceptor on serotonin-producing neurons in the brainstem, where it provides negative feedback to control serotonin release, and as a postsynaptic receptor in areas like the hippocampus, where it helps modulate emotional processing. Because serotonin is a key chemical messenger involved in anxiety, depression, and stress resilience, the regulation of its receptors is a major focus of neurobiological research. Variations that change the expression levels of these receptors may theoretically alter how an individual's brain processes emotional stimuli and recovers from stressful life events.
Research Associations and Evidence Strength
Scientific literature has explored the association between the rs6295 G-allele and various psychiatric phenotypes, including depression, anxiety, and panic disorder. Some studies suggest that the G-allele is linked to increased amygdala reactivity to emotional stimuli and altered parasympathetic nervous system activity, which may influence anxiety levels. However, the evidence remains limited and sometimes conflicting. While some research indicates that the G-allele might be a risk factor for mood disorders or reduced response to certain antidepressant treatments, other studies have found no significant association in different populations. Furthermore, the impact of this variant often appears to be context-dependent, meaning it may only manifest in the presence of significant environmental stressors or specific life events. Because of this complexity and the mixed results across different clinical studies, the evidence linking rs6295 to specific health outcomes is not considered definitive or diagnostic.
Population Frequency
The rs6295 variant is common across human populations. According to data from gnomAD, the minor allele frequency is approximately 0.47 in European populations, indicating that both the C and G alleles are present at relatively high frequencies.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs6295 do not determine your health outcomes in isolation. Human traits, especially those related to mood and stress, are polygenic, meaning they are influenced by hundreds of different genes, as well as complex interactions with your environment, lifestyle, and personal history. Having a specific genotype for rs6295 does not mean you will develop a particular condition, nor does it guarantee resilience. This information is for educational purposes and should not be used to make medical decisions or self-diagnose. If you are concerned about your mental health, stress levels, or how you might respond to psychiatric medications, please consult with a qualified healthcare professional or pharmacist. They can provide personalized guidance based on your full clinical picture rather than a single genetic marker.
How common is this variant?
The rs6295 variant is common across human populations, with a minor allele frequency of approximately 0.47 in European populations according to gnomAD.
Frequently asked questions
Is rs6295 a diagnostic test for depression?
No, rs6295 is not a diagnostic test for depression or any other mental health condition. Depression is a complex condition influenced by many genetic, environmental, and lifestyle factors, and this single variant cannot predict a diagnosis.
Does the G-allele mean I will have anxiety?
Not necessarily. While some research has associated the G-allele with altered anxiety levels or stress responses, many people with this genotype do not experience clinical anxiety. Genetics is only one piece of a much larger puzzle.
Can I use this information to choose an antidepressant?
You should not use this information to choose or change medications. Always discuss your treatment options and any concerns about medication response with your doctor or pharmacist, who can consider your entire medical history.
Where can I find more information on HTR1A?
You can find reliable information on the HTR1A gene through resources like the National Library of Medicine's Gene database or MedlinePlus Genetics. These sites provide comprehensive, peer-reviewed summaries of gene functions.
Sources & further reading
Educational information only, last refreshed 10/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs6295?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29