MAOA rs1491551510: Understanding This Rare Genetic Variant
The rs1491551510 variant is a rare single nucleotide polymorphism (SNP) located within the MAOA gene. It is currently classified as an intronic variant, meaning it sits in a non-coding region of the gene, and its specific functional impact remains under investigation.
What each genotype means
Common variant genotype
This genotype represents the most frequently observed sequence at this specific intronic location in the MAOA gene. As an intronic variant, its direct impact on the production or function of the MAOA enzyme is currently unknown and not established in clinical literature. Because this variant is rare and evidence is limited, it is not considered a diagnostic marker for any health condition.
This is the most common genotype observed in global populations for this specific variant.
Rare heterozygous variant
You carry one copy of the rare T allele at this intronic position. Current scientific research has not identified a functional consequence for this specific variant, and it is not linked to changes in MAOA enzyme activity or clinical health outcomes. Please note that this variant is distinct from well-studied MAOA functional polymorphisms like the uVNTR or rs6323.
This genotype is rare and observed at very low frequencies across most ancestral populations.
Rare homozygous variant
You carry two copies of the rare T allele at this intronic position. There is currently no published evidence suggesting that this specific genotype alters gene expression or contributes to any known clinical phenotype. As this is an intronic variant with limited research, it is not used to predict health risks or behavioral traits.
This genotype is extremely rare and is found in a very small fraction of the population.
What is rs1491551510?
The rs1491551510 variant is a specific genetic change identified in the MAOA gene. In genomics, a SNP (single nucleotide polymorphism) represents a variation at a single position in the DNA sequence. This particular variant is categorized as an intronic variant, which means it is located within an intron—a segment of DNA that does not provide direct instructions for building the MAOA protein. While exons contain the coding information for proteins, introns are often involved in regulatory processes that determine how much of a protein is produced or when it is expressed. Because rs1491551510 is a relatively recently annotated variant in major databases like gnomAD and TOPMED, it has not yet been the subject of extensive clinical or functional characterization compared to more well-known MAOA polymorphisms.
The Role of the MAOA Gene
The MAOA gene provides the blueprint for the enzyme monoamine oxidase A. This enzyme plays a critical role in the nervous system by breaking down neurotransmitters such as serotonin, norepinephrine, and dopamine. By regulating the levels of these chemical messengers, the MAOA enzyme helps maintain balance in brain signaling pathways. When the MAOA enzyme functions normally, it ensures that these neurotransmitters are cleared from the synapse after they have transmitted their signals. Variations in the MAOA gene, particularly those in the promoter region (often referred to as MAOA-uVNTR), have been extensively studied for their potential influence on behavioral traits, emotional regulation, and responses to environmental stressors. However, it is important to distinguish these well-characterized promoter variants from intronic variants like rs1491551510, which may have different or currently unknown regulatory roles.
Research and Evidence Strength
Current evidence regarding the clinical significance of rs1491551510 is limited. While the variant is documented in genomic repositories, it has not been linked to specific health outcomes, behavioral traits, or disease risks in peer-reviewed literature. Much of the existing research on MAOA focuses on the 'uVNTR' polymorphism, which has been investigated for associations with aggression, impulsivity, and mood regulation. Because rs1491551510 is a distinct, rare intronic variant, it should not be conflated with these better-studied markers. Genomic databases currently report no established clinical significance for this variant in ClinVar. As with many rare variants identified through large-scale sequencing projects, the scientific community is still in the early stages of determining whether this specific SNP has any measurable impact on human biology or if it is a neutral variation with no clinical consequence.
Population Frequency
The rs1491551510 variant is considered rare across global populations. Data from large-scale genomic projects, such as gnomAD, indicate that the vast majority of individuals carry the common (reference) allele at this position. Because the variant is so infrequent, it is difficult to draw conclusions about its distribution across different ancestral groups. In many populations, the frequency of the alternative allele is near zero, which is typical for rare variants that have not undergone significant selective pressure or population expansion. This rarity is a primary reason why functional studies are challenging to conduct; there are simply very few individuals who carry the variant to allow for meaningful statistical analysis of potential phenotypic associations.
Interpreting Your Genetic Information
If you have encountered this variant in a personal genetic report, it is important to maintain perspective on the current state of genomic science. Because rs1491551510 lacks established clinical associations, it is not currently used to predict health outcomes, personality traits, or medication responses. Genetic information is complex, and most traits are influenced by a combination of many genes, environmental factors, and lifestyle choices. You cannot use this information to diagnose a condition or guide medical decisions. If you have concerns about your health or behavioral patterns, the most appropriate step is to consult with a qualified healthcare provider or a genetic counselor. They can help you interpret your overall health profile in the context of validated clinical evidence, rather than focusing on individual, uncharacterized variants that have no clear medical application.
How common is this variant?
The rs1491551510 variant is rare, with the reference allele (T) being present in the vast majority of individuals across all major ancestral populations.
Frequently asked questions
Is rs1491551510 associated with aggression?
No. While other variants in the MAOA gene, such as the MAOA-uVNTR, have been studied for potential links to behavior, there is no scientific evidence linking rs1491551510 to aggression or any other behavioral trait.
Should I be worried if I have this variant?
No. This variant is currently considered to have no known clinical significance. It is a common occurrence to find rare, uncharacterized variants in your DNA, and most do not have any impact on your health.
Can this variant affect how I respond to medication?
There is no evidence that rs1491551510 affects medication response. If you have questions about how your genetics might influence your response to a specific drug, please discuss this with your doctor or pharmacist.
Where can I find more information about MAOA variants?
You can search the NCBI ClinVar or dbSNP databases for the most up-to-date clinical information. For general information on the MAOA gene, MedlinePlus Genetics provides reliable, plain-language summaries.
Sources & further reading
Educational information only, last refreshed 11/2/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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