MAOA rs6323: Understanding This Genetic Variant
The rs6323 variant is a synonymous genetic change located within the MAOA gene, which provides instructions for making the monoamine oxidase A enzyme. Research suggests this variant may correlate with variations in enzyme activity levels and individual responses to certain medications.
What each genotype means
Higher enzyme activity
This genotype is associated with the highest activity form of the monoamine oxidase A enzyme. Research suggests that individuals with this genotype may show a lower magnitude of response to placebo in certain clinical settings. Please discuss any concerns regarding medication response or neurotransmitter metabolism with your clinician or pharmacist.
This genotype is common globally, though exact frequencies vary significantly by ancestry.
Intermediate enzyme activity
This genotype represents a combination of the high-activity and lower-activity alleles for this variant. Because the MAOA gene is located on the X chromosome, the functional impact in females depends on X-inactivation patterns, while males carry only one copy. Please discuss any concerns regarding medication response or neurotransmitter metabolism with your clinician or pharmacist.
This heterozygous genotype is frequently observed in populations where both alleles are prevalent.
Lower enzyme activity
This genotype is associated with lower activity levels of the monoamine oxidase A enzyme compared to the GG genotype. Associations between this variant and neurotransmitter metabolism are complex and may be influenced by other genetic and environmental factors. Please discuss any concerns regarding medication response or neurotransmitter metabolism with your clinician or pharmacist.
This genotype is found across global populations, with the minor allele frequency for the A allele reported at approximately 0.35.
What is rs6323 and Where is it Located?
The rs6323 variant is a single nucleotide polymorphism (SNP) situated within the MAOA gene on the X chromosome. In genetics, a SNP represents a variation at a single position in the DNA sequence. Specifically, rs6323 is classified as a synonymous coding variant, often referred to as R297R. This means that while the DNA sequence changes at this specific location, the change does not alter the amino acid sequence of the resulting protein. Despite this, researchers study such variants because they can sometimes influence how a gene is expressed, how the messenger RNA is processed, or how the final protein functions within the body. Because it sits on the X chromosome, the inheritance pattern and the number of copies of this gene differ between biological males, who have one X chromosome, and biological females, who have two.
The Role of the MAOA Gene
The MAOA gene encodes the monoamine oxidase A enzyme, which plays a critical role in the nervous system by breaking down neurotransmitters. These chemical messengers, including serotonin, norepinephrine, and dopamine, are essential for regulating mood, emotion, and behavior. By degrading these neurotransmitters after they have performed their signaling duties, the MAOA enzyme helps maintain a balanced chemical environment in the brain. When the activity of this enzyme is altered, it can theoretically impact the levels of these neurotransmitters, which has led scientists to investigate the gene's involvement in various neuropsychiatric conditions and personality traits. It is important to note that the MAOA gene is just one of many factors that influence brain chemistry; environmental factors, other genes, and life experiences also play significant roles in shaping human behavior and mental health.
Research Associations and Evidence Strength
Scientific research into rs6323 has explored its potential links to monoamine metabolism and individual responses to selective serotonin reuptake inhibitors (SSRIs). Some studies have suggested that different genotypes at this position might correlate with variations in enzyme activity or the magnitude of response to certain antidepressant medications. Additionally, some research has examined rs6323 as part of larger genetic haplotypes to better understand its role in personality traits or behavioral outcomes. However, the evidence strength for these associations is currently considered limited. Many findings are based on small sample sizes or specific populations, and results have not always been consistent across different studies. Because of this, it is not possible to use this variant to predict clinical outcomes or diagnose conditions. The field of pharmacogenetics is complex, and any observed associations between genetic variants and drug response should be viewed as preliminary.
Population Frequency
The rs6323 variant is relatively common, with a minor allele frequency of approximately 0.35 in global populations. This means that a significant portion of the human population carries the less common allele, making it a widely distributed genetic variation across diverse ancestral groups.
What You Can and Cannot Do With This Information
Understanding your genetic profile can be an interesting way to learn about your biological makeup, but it is vital to maintain realistic expectations. You cannot use information about the rs6323 variant to diagnose yourself with a mental health condition or to predict how you will respond to a specific medication. Genetic variants are only one piece of a much larger puzzle that includes your environment, lifestyle, and overall health history. If you are curious about how your genetics might influence your response to a medication, the most important step is to have a conversation with your clinician or pharmacist. They are the only ones qualified to interpret genetic data in the context of your personal health and to make informed decisions about your treatment plan. Never make changes to your prescribed medications based on genetic test results without professional medical guidance.
How common is this variant?
The rs6323 variant has a minor allele frequency of approximately 0.35 globally, indicating it is a common variation found across many different ancestral populations.
Frequently asked questions
Can rs6323 predict if an antidepressant will work for me?
No, rs6323 cannot predict your response to antidepressants. While some research explores the role of MAOA in drug metabolism, these findings are preliminary and not used for clinical decision-making.
Is rs6323 the same as the 'Warrior Gene'?
No, the term 'Warrior Gene' typically refers to a different type of variation in the MAOA gene known as a variable-number tandem repeat (VNTR) in the promoter region, not the rs6323 SNP.
Should I change my medication based on my MAOA genotype?
Absolutely not. You should never change your medication or dosage based on genetic test results without consulting your doctor or pharmacist, as doing so could be dangerous.
Does having a specific rs6323 genotype mean I have a mental health disorder?
No, having a specific genotype at this location does not mean you have or will develop a mental health disorder. Genetics are only one small factor in complex health outcomes.
Sources & further reading
Educational information only, last refreshed 9/20/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs6323?
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 — $29Related variants in MAOA
Synonymous polymorphism in the monoamine oxidase A gene linked to variations in monoamine metabolism, behavioral traits, and antidepressant response.
This variant in the monoamine oxidase A gene is associated with higher anxiety scales in individuals with low resilience to psychological stress.