ABCC11 rs17822931: wet vs dry earwax (and body odor)

Genetics explainer · Updated June 2026

The one-SNP trait

Most things genetics can tell you about — height, metabolism, disease risk — come from many genes each contributing a sliver. Read enough of these explainers and you get used to the caveat that DNA nudges rather than decides: eye color, for instance, is mostly steered by HERC2 and OCA2 but still involves many other genes, and even a "single-gene" trait like red hair depends on which MC1R variants you carry and in what combination. Earwax type is the rare, refreshing exception. It's governed almost entirely by one variant in one gene, which makes it a favorite teaching example for how a single base-pair change can flip a visible trait.

ABCC11 stands for "ATP-binding cassette subfamily C member 11" — a mouthful that describes a family of proteins that use cellular energy to pump molecules across membranes. The gene codes for a transporter: a protein that sits in the cell membrane and shuttles specific compounds out of the cell. The rs17822931 variant is a single change in the gene's sequence (a G becoming an A), and that one letter swaps one amino acid in the finished protein.

The consequence is surprisingly dramatic for such a tiny change. The A version of the protein is unstable — the cell recognizes it as faulty and breaks it down before it can reach the membrane and do its job. With little functional transporter present, the glands that depend on ABCC11 secrete far less. And because the same transporter is used in two different places — the wax-making glands of the ear canal and the sweat glands of the armpit — that single letter shows up as two seemingly unrelated traits at once.

What the genotypes are associated with

The dry type is recessive, meaning you need two copies of the A allele to get it:

If you have even one G, you'll have wet earwax. Only the AA genotype gives the dry, crumbly kind — and that same genotype is associated with producing less underarm odor.

The recessive pattern is worth pausing on, because it explains something people often find counterintuitive: two wet-earwax parents can absolutely have a dry-earwax child. If both parents are AG (wet, but each carrying one hidden A), each has a one-in-four chance of passing A to a given child, and roughly a quarter of their children will land on AA and come out dry. The trait can appear to "skip" generations precisely because carriers show the wet type themselves. This is the same textbook Mendelian inheritance you'd draw in a Punnett square, which is part of why ABCC11 keeps turning up in genetics classes.

The earwax–armpit connection

Why would earwax and body odor be controlled by the same gene? Because the glands responsible are cousins. Both your ear-canal glands (the ceruminous glands, a specialized type of apocrine gland) and your underarm apocrine sweat glands rely on the ABCC11 transporter to move certain compounds out of the cell. Same protein, same variant, two body parts — so knocking down the transporter dials back both secretions together.

Underarm odor itself isn't produced by your body directly. Your apocrine glands release relatively odorless precursor molecules — including certain fatty acids and sulfur-containing compounds — and skin bacteria living in the armpit then break those down into the pungent molecules we recognize as sweat smell. In other words, the odor is a collaboration between your glands and your microbes. The ABCC11 transporter is one of the proteins that helps ferry those precursors to the surface. When the gene is in its non-working AA form, fewer precursors reach the skin — so there's simply less raw material for bacteria to convert into odor.

This is why the AA (dry earwax) type is associated with a milder body-odor tendency. It's a tendency, not a guarantee: diet, hormones, hygiene, and your particular skin bacteria all still play a role, and researchers have noted that some people carry the "low-odor" genotype yet still perceive that they smell — and vice versa. Genes set the baseline; the rest of daily life fills in the details.

The deodorant angle

There's a genuinely practical footnote to all this. People with the AA genotype make fewer odor precursors, and some of them go through life needing little or no deodorant at all — a fact that has real-world consequences for how personal-care products are marketed and used across different regions. In populations where dry earwax is common, a large share of people simply don't have much to mask. Some researchers studying the trait have pointed out the mismatch between near-universal deodorant marketing and the fraction of people who biologically don't need it.

None of this is a recommendation to throw out your deodorant on the strength of a genotype. It's worth remembering that antiperspirant (which blocks sweat) and deodorant (which reduces or masks odor) are different products solving different problems, and comfort is personal. But it is a nice example of biology quietly shaping an everyday habit: for a meaningful number of people, the "should I reapply?" question was answered by a single letter of DNA long before they ever stood in a drugstore aisle.

The striking population differences

Here's where it gets genuinely fascinating. The frequency of the dry-earwax A allele varies enormously around the world:

• In many East Asian populations, the A allele is the majority — so dry earwax is the norm.
• In people of European and African descent, the A allele is uncommon — so wet earwax dominates, often in the vast majority of people.

That makes rs17822931 one of the most geographically variable common traits in the human genome. The dry-earwax variant is thought to have risen to high frequency in East Asian ancestral populations long ago, which is why the trait — and its quieter-armpit side effect — clusters so strongly by ancestry today.

It even has a cultural footprint: in Japan, where the wet type is the minority, wet earwax has historically been notable enough to be discussed in everyday life. Few single genes leave such a clear fingerprint across both biology and geography.

Other things ABCC11 has been linked to — honestly

Because ABCC11 is a transporter, and transporters move all sorts of molecules, the gene has shown up in research beyond earwax and armpits. Two associations get mentioned most often:

• Colostrum and apocrine secretions. The ABCC11 transporter is active in the mammary glands, which are themselves modified apocrine glands. The variant has been associated with differences in the makeup of certain apocrine secretions. This is a biology-of-glands observation, not a health verdict.
• Drug transport in cancer research. Because ABCC11 can pump certain compounds — including some chemotherapy-related molecules — out of cells, it has been studied as a possible factor in how some tumors handle particular drugs. This is an active, unsettled research area, and it is emphatically not something a consumer earwax genotype can tell you anything actionable about.

The honest summary: outside the earwax-and-odor story, most ABCC11 associations are either preliminary, small, or belong to specialized clinical research rather than everyday self-knowledge. The clean, confident, teach-it-in-a-classroom part of the ABCC11 story is the wet/dry earwax and body-odor link. The rest is interesting background, not a takeaway to act on.

Why this trait is such a clean example

It's worth appreciating just how unusual rs17822931 is. The vast majority of "DNA trait" claims you'll encounter come with heavy hedging because dozens or hundreds of variants each contribute a little, the environment does much of the work, and any single marker explains only a sliver. ABCC11 is the opposite: one variant, one clear mechanism (a transporter that either works or doesn't), and a visible, binary-ish outcome you can literally check with a cotton swab. That combination — strong effect, known mechanism, and an easy-to-observe result — is why it's one of the first examples textbooks reach for when explaining how genotype maps to phenotype. If you've ever wanted a case where "your DNA says X" is actually close to true, this is it.

What it does and doesn't tell you

ABCC11 is a delightfully clean marker — knowing your genotype tells you, with unusual confidence, which earwax type to expect and which way your odor tendency leans. But it's still one variant, it describes tendencies rather than certainties, and it is not medical advice. Earwax type isn't something to treat; it's just a fun, tangible window into how your DNA shows up in everyday life.

The fun part is that, unlike most genetic findings, you can fact-check this one yourself. Look up your rs17822931 genotype, then check your own earwax. If you're AA, odds are good it's dry and flaky; if you carry a G, expect the sticky, yellow-brown kind. It's one of the few times your DNA readout and your bathroom mirror should simply agree — a small, satisfying demonstration that the genotype-to-trait arrow can, occasionally, point straight. And if you enjoy that kind of tangible, low-stakes genetics, it pairs nicely with other single-marker curiosities like why cilantro tastes like soap to some people, thanks to a smell-receptor variant.

Want to see this and other well-studied markers in your own file? Browse the Quanome gene library, try our free DNA explorer — which reads your raw data in your browser with nothing uploaded — or explore the rest of the Quanome blog.

Frequently asked questions

What does the ABCC11 gene control?

ABCC11 controls whether your earwax is wet (sticky, yellow-brown) or dry (flaky, grey). The very same variant also influences how much your underarm sweat glands secrete, which is why it's linked to body-odor tendency.

Which genotype gives dry earwax?

The dry type is recessive. Two copies of the A allele at rs17822931 (the AA genotype) give dry, flaky earwax. Having at least one G allele (AG or GG) gives the wet type. Dry earwax is associated with less underarm odor.

Why is wet earwax so much more common in some populations?

The dry-earwax A allele is very common in East Asian populations and rare in people of African and European descent. So dry earwax dominates in East Asia while wet earwax is the norm almost everywhere else. It's one of the most striking single-gene population differences known.

Does ABCC11 really predict body odor?

It predicts tendency, not destiny. The AA (dry) type produces fewer of the compounds underarm bacteria turn into odor, so people with it tend to produce less. Diet, hygiene, hormones, and bacteria all still matter. This is educational, not medical advice.

What does the ABCC11 protein actually do?

ABCC11 codes for a membrane transporter — a protein that pumps specific molecules out of cells. It's active in the ceruminous glands that make earwax and in the apocrine glands under your arms. The rs17822931 A allele changes one amino acid, and the altered protein is broken down inside the cell instead of doing its job, so those glands secrete less.

If I have the dry-earwax gene, do I still need deodorant?

Many AA (dry-type) people find they need much less deodorant, and some genuinely don't need it at all because they produce fewer odor precursors. But it varies from person to person, and antiperspirant (which reduces sweat) is a different product from deodorant (which masks or reduces odor). Use whatever keeps you comfortable — genetics just explains why some people can skip it.

Is wet or dry earwax better?

Neither is better or worse for health — they're just different secretions. Wet earwax is sticky and yellow-brown; dry earwax is flaky and pale. Both do the same job of protecting the ear canal. Earwax type is a trait, not a condition to fix.

Can 23andMe or AncestryDNA data show my ABCC11 type?

Often yes. rs17822931 is a well-known, commonly genotyped position, so it frequently appears in raw data files from consumer tests. A tool like Quanome's DNA explorer can read that marker on your own device without uploading your genome anywhere. Availability depends on the chip version your test used.