NRXN3 rs76191705: What Your Genotype Means
The rs76191705 variant is a specific genetic change located within the NRXN3 gene. It has been identified in clinical research as a potential marker that may influence how individuals respond to antidepressant medications.
What each genotype means
Potential antidepressant response marker
This genotype has been investigated in clinical studies for its potential association with symptom improvement during treatment with citalopram or escitalopram. However, research findings have been inconsistent, and this association failed to replicate in some large-scale studies. Please discuss your treatment plan and any medication concerns with your clinician or pharmacist.
This is a rare genotype found in human populations.
Potential antidepressant response marker
This genotype has been investigated in clinical studies for its potential association with symptom improvement during treatment with citalopram or escitalopram. However, research findings have been inconsistent, and this association failed to replicate in some large-scale studies. Please discuss your treatment plan and any medication concerns with your clinician or pharmacist.
This is a rare genotype found in human populations.
Potential antidepressant response marker
This genotype has been investigated in clinical studies for its potential association with symptom improvement during treatment with citalopram or escitalopram. However, research findings have been inconsistent, and this association failed to replicate in some large-scale studies. Please discuss your treatment plan and any medication concerns with your clinician or pharmacist.
This is a rare genotype found in human populations.
Understanding the SNP and Its Location
A single nucleotide polymorphism, or SNP, is a variation at a single position in a DNA sequence among individuals. The variant rs76191705 is located within the NRXN3 gene, which stands for Neurexin 3. In the human genome, this gene is situated on chromosome 14. SNPs like rs76191705 are essentially tiny differences in the genetic code that can occur across a population. While most SNPs have no observable effect on health or drug response, researchers study them to see if they correlate with specific biological traits or clinical outcomes. Because this variant is classified as rare, it is not found in the majority of the population, making it a subject of interest for specialized pharmacogenomic studies rather than broad, common-variant research.
The Role of the NRXN3 Gene
The NRXN3 gene provides instructions for making a protein called neurexin-3. Neurexins are a family of cell-surface proteins that play a critical role in the nervous system. They are primarily involved in the formation and maintenance of synapses, which are the junctions where nerve cells communicate with one another. By helping to organize the structure of these connections, neurexins facilitate the proper transmission of chemical signals between neurons. Because synaptic function is fundamental to brain health and mood regulation, variations in genes like NRXN3 are frequently investigated in the context of psychiatric conditions and the efficacy of medications that target neurotransmitter systems. Understanding how NRXN3 functions helps scientists hypothesize why certain genetic changes might alter the brain's response to therapeutic interventions.
Evidence and Antidepressant Response
The evidence linking rs76191705 to antidepressant treatment response is currently considered moderate. Clinical studies have identified this SNP as a potential marker, suggesting that individuals with specific genotypes might experience different outcomes when taking certain antidepressants. However, it is important to note that antidepressant response is a complex, polygenic trait, meaning it is influenced by many different genes and environmental factors working in combination. Most research in this field indicates that no single SNP can perfectly predict how a patient will respond to a specific drug. While the association with NRXN3 is a promising area of investigation, it remains a subject of ongoing scientific inquiry. Larger, more diverse clinical trials are necessary to confirm the strength and clinical utility of this association across different populations.
What You Can Do With This Information
If you have information about your genotype for rs76191705, it is essential to interpret it with caution. Genetic testing results should never be used to make independent medical decisions, such as starting, stopping, or changing the dosage of a prescribed medication. Because the science regarding this variant is still evolving, it is not currently used as a standard diagnostic tool in clinical practice. If you are concerned about your response to an antidepressant or are experiencing side effects, the most important step is to discuss these findings with your clinician or pharmacist. They can provide context based on your full medical history, current symptoms, and established clinical guidelines. Your healthcare provider is the only person qualified to determine if your genetic profile warrants any adjustments to your treatment plan.
How common is this variant?
The rs76191705 variant is documented as a rare SNP, meaning the minor allele occurs at a low frequency across most global populations.
Frequently asked questions
Can this genetic test tell me which antidepressant will work best?
No. While some genetic variants are associated with drug response, antidepressant efficacy is influenced by many factors. This SNP is not a definitive predictor of treatment success.
Should I change my medication based on my NRXN3 genotype?
Absolutely not. You should never alter your medication regimen without consulting your doctor. Genetic information is only one piece of a much larger clinical puzzle.
Is NRXN3 related to depression risk?
Research into NRXN3 often focuses on its role in synaptic function and brain health. While it is studied in the context of psychiatric conditions, it is not a diagnostic test for depression.
Where can I find more information on pharmacogenomics?
You can visit resources like PharmGKB or MedlinePlus Genetics for reliable, evidence-based information on how genes affect drug response. Always discuss these resources with your healthcare provider.
Sources & further reading
Educational information only, last refreshed 10/3/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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