NINJ2 rs3806263: Understanding This Genetic Variant
The rs3806263 variant is a single-nucleotide polymorphism located within the NINJ2 gene. Research has investigated this variant for potential associations with behavioral health outcomes, including suicide attempts, though the evidence remains limited.
What each genotype means
Typical NINJ2 genotype
This genotype represents the most common form of the NINJ2 gene variant. While some research has investigated links between NINJ2 polymorphisms and behavioral health outcomes, the evidence remains limited and does not indicate a direct cause for any specific condition.
This is the major allele genotype and is found in the majority of the global population.
Heterozygous NINJ2 variant
Carrying one copy of the variant allele has been studied in the context of potential associations with neurological and behavioral health, but current findings are not conclusive. This result should be viewed as a research-based observation rather than a clinical indicator of health risk.
This heterozygous genotype is observed at variable frequencies across different global populations.
Variant NINJ2 genotype
This genotype represents the minor allele variant, which has been explored in studies regarding its potential role in nerve regeneration and behavioral health. Because the evidence linking this specific variant to clinical outcomes is limited and mixed, it cannot be used to predict individual health outcomes.
This genotype is less common than the major allele and its frequency varies significantly depending on ancestral background.
What is rs3806263?
The rs3806263 variant is a specific change in the DNA sequence, known as a single-nucleotide polymorphism (SNP), located within the NINJ2 gene. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. The NINJ2 gene is situated on chromosome 12 at position 12p13.33. This gene encodes a protein called ninjurin 2, which is a transmembrane adhesion molecule. Scientists study these variations to understand how small differences in our genetic code might influence biological processes or susceptibility to certain health conditions. Because rs3806263 is located within a gene that plays a role in nerve-related processes, it has been a subject of interest in various genetic association studies.
The Role of the NINJ2 Gene
The NINJ2 gene, which stands for 'nerve injury-induced protein 2,' is primarily known for its role in the nervous system. The protein it produces, ninjurin 2, is involved in cell-to-cell adhesion and is thought to promote nerve regeneration and axonal growth following nerve injury. Beyond its role in the nervous system, research has suggested that NINJ2 may also be involved in regulating endothelial inflammation and processes related to atherosclerosis. Because of these functions, variations in or near the NINJ2 gene have been investigated in the context of several complex conditions, including cardiovascular health, stroke, and various behavioral health traits. Understanding the function of the gene helps researchers hypothesize how specific variants might alter protein expression or function, potentially contributing to disease susceptibility.
Research and Evidence Strength
The association between rs3806263 and behavioral health outcomes, such as suicide attempts, is currently considered to have limited evidence. While some studies have explored this link, particularly in specific populations like the Iranian population, the findings are not universally replicated across all ethnic groups. Genetic association studies often face challenges, including the complexity of behavioral traits, which are influenced by a combination of many genetic factors, environmental influences, and socioeconomic conditions. It is important to note that having a specific genotype at this location does not mean an individual will develop a particular condition. The current scientific consensus emphasizes that these associations are preliminary and require further large-scale, diverse studies to confirm their clinical significance and biological mechanisms.
Population Frequency
The frequency of the rs3806263 variant is variable across different global populations. Genetic variants often show different distribution patterns depending on ancestral background, which is a common observation in human genomics. Because the frequency of the alleles (the specific versions of the SNP) can differ significantly between groups, it is difficult to define a single 'normal' or 'common' frequency for the entire human population. Researchers use databases like gnomAD to track these frequencies, but for many variants, the data may be more robust for some ancestries than others. This variability underscores the importance of conducting genetic research in diverse cohorts to ensure that findings are applicable to a broad range of people rather than being limited to a single demographic.
What This Information Means for You
It is crucial to understand that genetic variants like rs3806263 are not diagnostic tools. They represent statistical associations observed in research studies rather than definitive medical predictions. You cannot use this information to diagnose yourself or others with a behavioral health condition. If you have concerns about your mental health or behavioral well-being, the most effective approach is to consult with a qualified healthcare professional, such as a psychiatrist, psychologist, or primary care physician. They can provide a comprehensive evaluation based on your personal history, symptoms, and clinical presentation. Genetic information is only one small piece of a much larger puzzle, and it should never replace professional medical advice, diagnosis, or treatment plans.
How common is this variant?
The frequency of the rs3806263 variant is variable across different global populations, with no single frequency applicable to all ancestral groups.
Frequently asked questions
Can I use rs3806263 to predict my risk of suicide?
No. Genetic variants like rs3806263 are not diagnostic and cannot predict individual risk for complex behavioral health outcomes. Suicide risk is influenced by a wide range of environmental, social, and clinical factors that are far more significant than any single genetic variant.
Is NINJ2 a 'suicide gene'?
No. There is no such thing as a 'suicide gene.' Behavioral health traits are polygenic, meaning they are influenced by hundreds or thousands of genetic variants, each contributing a very small effect, alongside significant environmental and life experiences.
Where can I find more information about my own genetic data?
If you have received genetic testing results, you should discuss them with a certified genetic counselor or your healthcare provider. They can help you interpret the information in the context of your personal and family health history.
Why is the evidence for this variant considered limited?
Evidence is considered limited when studies are small, findings have not been consistently replicated across different populations, or the biological mechanism linking the variant to the trait is not fully understood. Scientific research requires rigorous, large-scale validation before associations can be considered clinically established.
Sources & further reading
Educational information only, last refreshed 9/28/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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