TPH2 rs7305115: What Your Genotype Means
The rs7305115 variant is a single nucleotide polymorphism located within the TPH2 gene. Research has investigated its potential association with the risk of suicide attempts in individuals diagnosed with major depressive disorder.
What each genotype means
Lower suicide attempt risk
Research, particularly in Chinese populations, has associated the AA genotype with a significantly lower risk of suicide attempts in patients diagnosed with major depressive disorder. This variant is located in the TPH2 gene, which is involved in brain serotonin production, though findings across different global populations have been inconsistent and sometimes contradictory.
Frequency varies significantly by ancestry, with the A allele being more commonly studied in East Asian populations.
Variable risk profile
The AG genotype represents a heterozygous state for this TPH2 variant. While some studies suggest that carrying the G allele may be associated with higher risks of suicidal behavior compared to the AA genotype, other research has found no significant association, indicating that the impact of this genotype is not uniform across all populations.
This genotype is found in various populations, though its prevalence is highly dependent on the specific ethnic background of the individual.
Potential higher risk profile
The GG genotype has been investigated for potential associations with an increased risk of suicidal behavior in some studies, though results remain inconsistent across different ethnic groups. Additionally, the G allele has been linked in some research to lower TPH2 mRNA expression in the brain and may influence the response to certain non-SSRI antidepressant medications; please discuss any medication concerns with your clinician.
The frequency of the GG genotype is variable and has been documented across diverse populations, including European and Asian cohorts.
Understanding the rs7305115 Variant
The rs7305115 variant is a specific genetic change, or single nucleotide polymorphism (SNP), located on chromosome 12. In the context of human genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This particular variant is situated within the TPH2 gene, which provides instructions for making the tryptophan hydroxylase 2 enzyme. Scientists study such variants to understand how subtle differences in our genetic code might influence biological processes or susceptibility to certain health conditions. Because this variant is located in a gene involved in neurotransmitter production, it has been a subject of interest in psychiatric genetics research, particularly regarding its potential role in mood-related traits and behaviors.
The Role of the TPH2 Gene
The TPH2 gene encodes the tryptophan hydroxylase 2 enzyme, which is primarily expressed in the brain. This enzyme is responsible for the first and rate-limiting step in the biosynthesis of serotonin, a critical neurotransmitter that helps regulate mood, sleep, appetite, and emotional responses. By controlling the production of serotonin, TPH2 plays a fundamental role in maintaining chemical balance within the central nervous system. Disruptions or variations in this gene can theoretically alter serotonin levels, which is why researchers have long hypothesized that TPH2 variants might contribute to the underlying biology of psychiatric disorders, including major depressive disorder and associated behavioral traits like suicide attempts.
Research and Evidence Strength
Evidence regarding the association between rs7305115 and suicide attempts is considered moderate and is primarily derived from candidate gene studies. Some research, particularly in Chinese populations, has suggested that the AA genotype may be associated with a lower risk of suicide attempts in patients with major depressive disorder compared to other genotypes. However, it is important to note that genetic associations can be complex and are often influenced by ancestry, environmental factors, and the polygenic nature of psychiatric traits. While some studies have identified potential links, other research in different populations has yielded mixed results. Consequently, this variant is not considered a definitive diagnostic tool, and the scientific community continues to explore how such markers interact with broader genetic and environmental landscapes.
Population Frequency and Context
The frequency of the rs7305115 variant varies significantly across different global populations. Much of the existing literature focusing on this specific SNP has been conducted in Chinese cohorts, where the distribution of the A and G alleles has been documented in the context of psychiatric research. Because genetic studies are often ancestry-specific, the findings observed in one population may not necessarily translate to others. Understanding the prevalence of this variant requires looking at large-scale genomic databases, which show that allele frequencies are not uniform worldwide. Researchers emphasize that these frequency differences are a normal part of human genetic diversity and highlight the importance of conducting diverse, large-scale studies to fully understand the impact of any genetic variant.
Interpreting Genetic Information
It is essential to understand that having a specific genotype for rs7305115 does not determine one's health outcomes. Psychiatric conditions like major depressive disorder are highly complex, involving a combination of genetic, environmental, and social factors. Genetic information should never be used to diagnose a condition or make medical decisions independently. If you are concerned about your mental health or have questions about how genetics might relate to your personal health history, please consult with a qualified healthcare professional or a genetic counselor. They can provide context based on your individual circumstances and help you navigate medical decisions. Never change or stop any prescribed medication based on genetic test results without first discussing it with your clinician or pharmacist.
How common is this variant?
The frequency of the rs7305115 variant is variable across different ancestral groups, with most research to date focusing on Chinese populations.
Frequently asked questions
Does the rs7305115 variant cause depression?
No, this variant does not cause depression. Major depressive disorder is a complex condition influenced by many genetic and environmental factors, and this SNP is only one of many potential markers being studied.
Can I use this SNP to predict my risk of suicide?
No. Genetic variants like rs7305115 are not predictive tools for individual risk. Suicide risk is multifactorial, and genetic markers cannot account for the complex interplay of life experiences and mental health.
Should I change my medication based on this result?
Absolutely not. You should never alter your medication regimen based on genetic test results. Always consult your doctor or pharmacist before making any changes to your prescribed treatment.
Why do studies show different results for this SNP?
Genetic associations can vary due to differences in study design, sample sizes, and the ancestral backgrounds of the participants. This is common in psychiatric genetics, where many small effects contribute to a trait.
Sources & further reading
Educational information only, last refreshed 10/14/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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