By Russell Browne (Dip. Adv. Nut.) · Specialist in Genetic Nutrition & Methylation Protocols
MAO-A is famous for the wrong reason. Somewhere along the way it got nicknamed the “warrior gene,” and that label — dramatic, sticky, and badly oversimplified — now shapes most of what people read about it. This guide gives you the accurate version: what MAO-A does, what its common variant is, and why the “warrior gene” framing does more harm than good.
What the MAO-A gene does
MAO-A stands for monoamine oxidase A — an enzyme that helps break down several neurotransmitters, including serotonin, dopamine, and norepinephrine. It’s part of how your body clears these signaling molecules after they’ve done their work. That’s a normal, essential housekeeping role.
The common variant
The variant most often listed on consumer reports is rs6323. (There’s also a well-known promoter-region repeat, sometimes labeled the “high” or “low” activity version, that features heavily in the “warrior gene” stories.) These variants are common — a large share of the population carries them.
Why “warrior gene” is misleading
The “warrior gene” label came from studies linking a low-activity MAO-A version to aggression — but those findings were narrow, context-dependent, and heavily influenced by environment, especially early-life experiences. The science never supported the leap to “this gene makes you aggressive,” and researchers have repeatedly cautioned against that reading.
A single variant in one enzyme does not determine temperament, behavior, or character. Any associations found are relative, probabilistic, and entangled with environment and many other genes. Treat “warrior gene” content as pop-science shorthand, not a description of who you are.
What the research reasonably supports
The defensible summary: MAO-A influences the activity of an enzyme that clears certain neurotransmitters, and researchers have studied its variants in connection with mood- and behavior-related traits. The findings are nuanced, environment-dependent, and far from deterministic. Carrying either version is common and normal.
How to find your result
Your existing 23andMe or AncestryDNA file already contains this marker (look up rs6323). As with other variants, raw files may report a different strand than papers use, so an analysis tool that reports your genotype directly is less error-prone than reading the file by hand.
What your result means — and what to do
If you find your MAO-A genotype:
- It’s a common variant and, on its own, not a diagnosis or a verdict on your personality.
- Any associations are modest, population-level, and shaped heavily by environment.
- If you’re exploring this alongside real questions about mood or mental health, that’s a conversation for a qualified practitioner who can see the whole picture — not something to act on from a gene result or a “warrior gene” article. We don’t give treatment or supplement advice here.
See your own result
Curious what you carry, minus the mythology? Your existing raw file already contains rs6323 — no new test needed.
Upload your 23andMe or AncestryDNA file to see your MAO-A result in a plain-language variant report, and interpret it with a professional rather than the “warrior gene” headline.
About the Author
Russell Browne (Dip. Adv. Nut.)
Specialist in Genetic Nutrition & Methylation Protocols
Russell Browne is a qualified practitioner of Advanced Nutrition, Advanced Herbalism, and Homeopathy, with a specialized clinical focus on genetic nutrition, methylation pathways, and detoxification. With years of dedicated clinical experience helping patients decode complex chronic health issues, Russell is also the author of How to Treat Your MTHFR Gene Mutations the Right Way – The Genetic Advantage and several works on genetic wellness. He is committed to bridging the gap between complex genetic data and practical, root-cause clinical care.
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