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Skin and genes: what research shows

Reviewed by Dr. Daniel Wallerstorfer, molecular biologist and founder of Novogenia · Updated: 13 October 2026 · Reading time: 9 min

MC1R: a pigment gene and the age people see in your face

A gene best known from red hair also plays a part in how old a face looks. That is what an international research team found when it studied 2,693 older people from the Dutch Rotterdam Study. Based on facial photographs, the researchers estimated how old each person looked; then they searched more than eight million gene variants for a link. The strongest signal came from the MC1R gene. People who carried two copies of a particular MC1R version looked on average up to two years older than people without it – regardless of age, sex, skin color and visible sun damage. Two further groups from the Netherlands and the UK confirmed the finding (Liu et al., Current Biology, 2016).

So what does MC1R actually do? Picture it as a switch in the pigment cells. When it is “on,” the cells produce dark pigment that shields the skin from UV radiation. When the switch works less effectively, more red pigment forms and the skin tans less easily. As early as 1995, a British team found MC1R variants in more than 80% of people with red hair or fair skin that barely tans – but in fewer than 20% of people with brown or black hair and in fewer than 4% of those who tan well (Valverde et al., Nature Genetics, 1995).

What makes this exciting: the Rotterdam researchers suggest that MC1R also acts beyond pigment production. For skincare, the practical takeaway is simple: people with reduced-function MC1R genes benefit especially from consistent sun protection and from skincare that protects the skin in everyday life. How MC1R relates to skin hydration is told in the gene story Skin hydration and the MC1R gene.

Twins: same genes, different faces

How much of this is predisposition and how much is everyday life? Identical twins give the best answer, because they share all their genes. At the Twins Day Festival in Twinsburg, Ohio, 186 pairs of identical twins completed a detailed questionnaire and had their photographs taken. A panel then assessed how much older or younger one twin looked than the other. The result reads like a skincare guide: the longer a twin had smoked, the older he or she looked. More sun exposure was also associated with an older appearance, and this link grew stronger with age – and the same applied to a history of outdoor activities and a lack of sunscreen use (Guyuron et al., Plastic and Reconstructive Surgery, 2009).

A study of 102 female twin pairs from Denmark completes the picture: for wrinkles, pigment spots, visible sun damage and perceived age, genes and environment played roughly equal roles (Gunn et al., PLoS One, 2009).

From this we can conclude: genes set the starting point for your skin. Where it goes from there, you help decide every day. Genes are not destiny – they are a pointer to where skincare pays off most.

Collagen: the scaffold and the scissors (MMP1)

Collagen is your skin’s scaffold. It gives the skin firmness and elasticity. To keep the scaffold stable, the body constantly builds new collagen and clears away old collagen. For the clearing, it needs a pair of scissors: the enzyme MMP-1, built from the instructions in the MMP1 gene.

How strongly UV light drives these scissors was shown in a study of 59 adults. A single UV exposure was enough to increase the production of three enzymes in the skin that break down connective tissue, including collagenase. In irradiated skin, collagen breakdown was 58% higher than in non-irradiated skin. After four exposures at two-day intervals, collagenase activity stayed elevated for seven days – at its peak 4.4 times the baseline level (Fisher et al., New England Journal of Medicine, 1997).

How sharply your scissors are set also depends on your genes. The MMP1 gene has a common variant with two versions, called 1G and 2G (rs1799750). In the SALIA cohort of 697 older women, skin wrinkling and lung aging were linked only in carriers of the 2G version, not in women with two 1G copies. The researchers therefore see 2G as an indicator of a common genetic susceptibility to the aging of both tissues (Vierkötter et al., Journal of Investigative Dermatology, 2015).

For skincare, this means: carriers of the 2G version gain the most from daily sun protection and from care that supports firmness and elasticity. More in the gene stories Collagen break-down and the MMP1 gene and Collagen production and the CYP1A2 gene.

Filaggrin: the moisture reservoir of the outer skin layer

The outermost layer of the skin, the stratum corneum, is the border between you and the world. To stay supple, it needs water – and substances that hold on to that water. Together, these substances are called the natural moisturizing factor. Think of them as tiny moisture magnets. A large share of them comes from a protein called filaggrin: when it is broken down in the outer skin layer, its fragments become exactly these magnets.

What happens when the filaggrin gene is defective has been measured directly. People with a defective filaggrin gene have less natural moisturizing factor in the stratum corneum (Kezic et al., Journal of Investigative Dermatology, 2008). And even a single defective gene copy contributes to dry skin – in young adults as well as in older people (Sergeant et al., Journal of Investigative Dermatology, 2009).

From this we can conclude: when the skin produces fewer of its own magnets, care that protects against moisture loss is especially worthwhile. The good news: hydration is one of the topics where daily skincare makes a direct difference.

Free radicals: the fire brigade of SOD2, GPX1 and NQO1

Sunlight releases free radicals in the skin – aggressive particles that attack proteins, fats and DNA. A review by researchers at the University of Salzburg sums it up: extrinsic, environment-driven skin aging is driven to a large extent by this oxidative stress from UV radiation. Against this attack, the skin has a fire brigade. It includes enzymes such as superoxide dismutases, catalases and glutathione peroxidases, as well as substances such as vitamin C, vitamin E, coenzyme Q10 and glutathione. With age, the outermost skin layer also changes: its antioxidant capacity shifts and its barrier function declines (Rinnerthaler et al., Biomolecules, 2015).

Three genes build important parts of this fire brigade:

• SOD2: puts out free radicals where they form most often – in the power plants of the cells.
• GPX1: builds glutathione peroxidase, which defuses harmful peroxides. It needs selenium as a building block to do so.
• NQO1: keeps coenzyme Q10 in its active, protective form – more on this in Personalized cosmetics.

If one of these crews works less effectively, the skin has fewer reserves of its own. For skincare, this means: antioxidant support from outside is especially worthwhile there – selected according to the part of the fire brigade that needs help. The gene stories Oxidative stress and your skin-defence genes and Selenium and the GPX1 gene go deeper.

At a glance: genes, research and skincare

The Beauty analysis covers even more topics, such as collagen production and the skin’s inflammation tendency (TNF-α, IL6). How the messengers behind inflammation tendency relate to skin aging is explained in the gene story Inflammatory skin ageing and your cytokine genes.

Genes are not destiny: what this means for consultations

All these studies point in the same direction: genes give the skin a starting position, and everyday life writes the rest of the story. That is the message you can pass on to your clients. For consultations, this means:

• Predisposition, not forecast: a genetic result shows where the skin is naturally stronger or weaker – not what it will look like in ten years.
• Sun protection first: for MC1R and MMP1, UV is the strongest lever. No skincare product replaces sunscreen.
• Targeted, not more: the skin profile shows which care topics take priority for this person – hydration, antioxidant care or firmness.
• Honest context: the genetic traits are well documented; each gene in the analysis is backed by at least three independent studies. The skincare recommendation derived from them is a logical conclusion and has not been proven in studies for every effect.
• Know the boundary: the Beauty analysis is not a diagnosis. Skin changes and symptoms belong with a dermatologist.

How the skin profile becomes a concrete formula is shown in Personalized cosmetics: how genes shape the formula. How you may talk about skincare effects is explained in Advertising cosmetics.

Frequently asked questions

Related: Personalized cosmetics: how genes shape the formula · Gene story: collagen break-down and the MMP1 gene · BeautyMe: personalized skincare

Note: This guide is general information for businesses and professionals and does not replace legal advice. BeautyMe products are cosmetic products; statements in this guide are not promises of cure. The genetic traits determined in a genetic analysis are well documented (each gene included is backed by at least three independent studies); recommendations for skincare and formulation derived from them are logical conclusions, not scientifically proven. Regulations can change; errors and changes excepted.