Pointy noses are shaped by a combination of your genes, your ancestors’ climate, and in some cases, DNA inherited from Neanderthals. The sharpness or projection of your nasal tip comes down to how cartilage grows and positions itself during development, and that process is controlled by several specific genes that vary across populations. No single factor explains it, but researchers have identified the key players.
The Genes Behind Nose Shape
A landmark 2016 study of over 6,000 Latin Americans identified several genes directly tied to nose shape. The gene with the strongest connection to a pointy, projected nose is called DCHS2, which sits on chromosome 4. This gene produces a protein involved in cartilage development during the formation of your face. Specific variants in DCHS2 influence columella inclination (the angle of the strip of tissue between your nostrils), nose tip angle, and how far your nose sticks out from your face. Together, these three measurements largely determine whether a nose reads as “pointy” or flat.
Another gene, RUNX2 on chromosome 6, controls the width of the nasal bridge. Variants that produce a narrower bridge contribute to the overall appearance of a pointed nose, even if the tip itself isn’t especially projected. A third gene, GLI3, affects nostril width. When you combine a narrow bridge, narrow nostrils, and a projected tip, you get what most people picture as a classically pointy nose.
Each of these genes explains only a small fraction of overall nose variation on its own. DCHS2 variants account for about 0.5% of the variation in columella angle, for example. That sounds tiny, but facial features are shaped by dozens or hundreds of genetic variants working together, each nudging cartilage and bone growth slightly in one direction.
Why Climate Shaped the Nose
Your nose isn’t just decorative. It warms and humidifies the air you breathe before it reaches your lungs. In cold, dry environments, a longer, narrower nasal passage does this more efficiently because air travels a greater distance over moist tissue. In hot, humid climates, there’s less need for that conditioning, so wider nostrils and shorter nasal passages work fine.
A 2017 study confirmed this relationship by comparing nose measurements across populations with the temperature and humidity of their ancestral regions. Nostril width correlated with both temperature and absolute humidity, meaning populations from cold, dry areas tended to have narrower noses, while populations from warm, humid areas tended to have wider ones. This pattern, sometimes called Thomson’s Rule after the anthropologist Arthur Thomson, has been recognized for over a century but only recently confirmed with genetic and statistical tools.
This doesn’t mean every person from a cold climate has a narrow nose. It means that over thousands of years, natural selection slightly favored narrower nasal passages in those environments, shifting the average across a population.
Neanderthal DNA and Nasal Height
Some of the genetic variation behind pointy noses is genuinely ancient. A 2023 study found that a gene called ATF3, which increases nasal height (the distance from the bridge to the base of the nose), was inherited from Neanderthals. People with Native American and East Asian ancestry frequently carry this Neanderthal-derived version of ATF3. The gene shows signs of natural selection, meaning it likely gave an advantage to early humans adapting to colder climates after migrating out of Africa.
A taller nose creates a longer internal passage, which again helps warm and moisten cold air. So this is a case where an ancient interbreeding event tens of thousands of years ago left a visible mark on modern faces. If you have a nose that’s tall from top to bottom with a pronounced bridge, part of that shape may trace back to Neanderthal ancestors.
How Anthropologists Classify Nose Shape
Scientists use a measurement called the nasal index to categorize nose shape. It’s the ratio of nose width to nose height, multiplied by 100. A nasal index below 70 is classified as leptorrhine, meaning long and narrow. Between 70 and 85 is mesorrhine, or medium. Above 85 is platyrrhine, or broad. Most Western Europeans fall into the leptorrhine category, while populations in sub-Saharan Africa and indigenous Australians tend toward platyrrhine noses. Most of the world’s population falls somewhere in the mesorrhine range.
These categories are statistical descriptions of population averages, not rigid boxes. Within any population, you’ll find the full spectrum of nose shapes. They’re useful for researchers studying how climate and genetics interact, but they don’t predict what any individual person’s nose will look like.
When Your Nose Takes Its Final Shape
If you’re wondering whether a pointy nose is something you’re born with or something that develops, the answer is both. The basic genetic blueprint is set at conception, but the nose doesn’t reach its adult form until the teenage years. The bony framework of the nasal bridge and the cartilage of the tip grow at different rates.
In girls, nasal height and bridge length typically reach their mature size by age 12, with nasal tip protrusion finalizing around 13. In boys, the same landmarks mature about two to three years later, with the bridge reaching adult size around 15 and tip projection finishing around the same age. This is why the nose can seem to change shape dramatically during puberty. It’s not just getting bigger. The proportions shift as cartilage and bone grow at different speeds, and the final result depends on which genetic variants you carry.
Children often have softer, rounder noses because the cartilage hasn’t fully elongated yet. A nose that looks unremarkable at age 8 can develop a pronounced point or bridge by 15, purely because of the timing of cartilage growth encoded in genes like DCHS2 and ATF3.