The ABCC11 Gene: Why Your Earwax Type Reveals a Body-Odor Secret

The 1-Minute Summary

• A single gene called ABCC11 decides whether you have wet earwax or dry earwax — and it also influences your underarm body odor.
• The trigger is one tiny change in your DNA (the SNP rs17822931). Inherit the "dry" version from both parents (genotype AA) and you tend to have dry earwax and less body odor.
• People of East Asian descent (Chinese, Korean, Japanese) mostly have dry earwax, while Thais and Southeast Asians sit in the middle, with a mix of both types.
• "Less body odor" does not mean you can skip showering or deodorant — odor still depends on skin bacteria, diet, and hygiene.
• This is a fun example of how one small gene can visibly shape the body. It is not a disease or a health risk to worry about.

Hi there, GeneusDNA readers! Today we have a small but genuinely fun story to tell. Ever wondered why some people find sticky, brownish, wet earwax when they clean their ears, while others find dry, flaky, crumbly stuff? The answer has nothing to do with hygiene — it was written in your DNA from birth. And here is the cool part: the very same gene also quietly hints at your body odor. Let's meet ABCC11, one of geneticists' favorite classic examples.

What Is the ABCC11 Gene, and Why Does It Matter?

ABCC11 is a gene that builds a transporter protein — a molecular "pump" that moves certain substances out of cells, especially in the glands that make earwax and in the apocrine sweat glands under your arms. The deciding factor sits at a single spot on this gene, a SNP called rs17822931, where one genetic letter changes from G to A. One letter, big effect.

We inherit one copy from each parent, so there are three possible outcomes:

• GG or GA (at least one G): the transporter works normally and pumps substances out, giving wet earwax and typical body odor.
• AA (an A from both parents): the transporter barely works, so very little is pumped out — resulting in dry earwax and usually less body odor.

What makes ABCC11 special is that it is one of the few human traits with a clear "single-gene" (Mendelian) pattern — unlike most traits such as height or skin tone, which are shaped by hundreds of genes working together.

How Are Earwax and Body Odor Even Connected?

It sounds like an odd pairing, right? The secret lies in the apocrine sweat glands under your arms. These glands release odor precursors — molecules that are actually odorless on their own, until skin bacteria break them down into the strong-smelling compounds we recognize as body odor.

The ABCC11 protein is exactly what pumps those odor precursors out. So in people with the AA genotype, where the transporter barely works, fewer precursors are released, leaving bacteria with less "raw material" to work on — and lighter body odor as a result. In short, dry earwax and reduced body odor come from the same genetic switch, which is why they tend to go together. It's also part of why deodorant products vary so much in popularity from region to region around the world.

Why Do East and Southeast Asians Have More Dry Earwax?

Here is the part that fascinates population geneticists. The frequency of the "dry" version (the A allele) varies dramatically around the globe:

• East Asia (China, Korea, Japan): the AA genotype is very common — in some populations, such as Koreans, nearly everyone has dry earwax.
• Southeast Asia, including Thailand: sits in the middle, with a genuine mix of dry and wet earwax that reflects the region's blended genetic heritage.
• Europe and Africa: the AA genotype is very rare, so most people have wet earwax.

Scientists believe the dry version became common in East Asia because the variant arose and spread among the region's ancestors, possibly aided by some form of natural selection — though exactly "why" is still debated. What's certain is that ABCC11 has become a handy genetic marker for studying human migration and population diversity.

Curious what other fun traits tiny genes can shape? Read more in our article on surprising genetic traits, and if you've ever wondered why cilantro tastes like soap to some people, check out the cilantro taste gene.

What the Science Does NOT Say

To keep things fair, let's clear up some common misconceptions:

• Dry earwax doesn't mean zero body odor: it just tends toward lighter odor. Real-world body odor also depends on your skin bacteria, diet, hormones, and hygiene. Showering and self-care still matter for everyone.
• This gene is not a disease: both wet and dry earwax are perfectly normal. Neither is "better" or "unhealthier" — it's simply natural human variation.
• Don't jump to other health conclusions: some studies have tried to link ABCC11 to other health topics, but the evidence remains limited and debated, so it shouldn't be over-interpreted.
• Association is not destiny: a DNA result is one piece of information that helps you understand yourself better — not a verdict. If you have health concerns, always consult a doctor.

References

1. Yoshiura K, et al. A SNP in the ABCC11 gene is the determinant of human earwax type. Nature Genetics. 2006. nature.com
2. Martin A, et al. A functional ABCC11 allele is essential in the biochemical formation of human axillary odor. Journal of Investigative Dermatology. 2010. jidonline.org