SLC45A2 rs16897810: What Your Genotype Means
The rs16897810 variant is a genetic marker located within the SLC45A2 gene, which plays a key role in human pigmentation. It is statistically associated with variations in skin, hair, and eye color across different human populations.
What each genotype means
Likely lighter pigmentation
You carry two copies of the derived G allele (encoding leucine at position 374), which is strongly associated with lighter skin, lighter eye color, and blonde or light brown hair. This genotype is also linked to reduced cutaneous melanin production and an increased sensitivity to UV-induced sunburn. Evidence indicates this is a natural human pigmentary variation rather than a medical condition.
Carried by more than 95% of individuals of European ancestry, but is very rare in individuals of African and East Asian ancestries.
Intermediate pigmentation tendency
You carry one copy of the ancestral C allele and one copy of the derived G allele. Research shows that heterozygous individuals typically display intermediate pigmentation characteristics and melanin synthesis between the two homozygous types. Your exact skin tone and sun response will also depend on other genetic loci and environmental factors.
Found uncommonly in European populations (around 1% to 4%) and at variable low-to-moderate frequencies in admixed populations, such as Latin American cohorts.
Likely darker pigmentation
You carry two copies of the ancestral C allele (encoding phenylalanine at position 374), which is associated with darker skin, darker hair, and brown eyes. Studies show this genotype produces higher melanosomal melanin levels, offering naturally greater protection against UV-induced damage. While associated with lower sensitivity to sunburn, standard sun protection remains generally advisable.
Carried by more than 95% of individuals of African and East Asian ancestries, but is found in fewer than 1% of individuals of European ancestry.
Understanding the SLC45A2 Gene
The SLC45A2 gene, also known as MATP, provides the genetic blueprint for a protein located in specialized cells called melanocytes. These cells are responsible for producing melanin, the primary pigment that determines the color of human skin, hair, and eyes. Melanin is also present in the retina, where it is essential for normal vision. By regulating the environment within melanosomes—the structures where pigment is synthesized—the SLC45A2 protein helps control the amount and type of melanin produced. Because of its central role in pigment production, variations in this gene are frequently studied to understand the biological basis of human physical diversity. While most variations in this gene are associated with normal differences in appearance, mutations in SLC45A2 can also lead to rare conditions such as oculocutaneous albinism type 4, which affects pigmentation levels throughout the body.
What is the rs16897810 Variant?
The rs16897810 variant is a single nucleotide polymorphism (SNP) situated within the SLC45A2 gene. In genetics, a SNP represents a variation at a single position in the DNA sequence. This specific variant is often studied alongside other well-known markers in the same gene, such as the p.Phe374Leu (rs16891982) variant, which is widely recognized for its strong influence on light skin and hair pigmentation. Research indicates that rs16897810 sits in a region of the genome that has been subject to evolutionary pressure, particularly in populations where lighter skin tones became more prevalent. Scientists use these markers to map how specific genetic changes contribute to the wide spectrum of human pigmentation observed globally. While rs16897810 is a useful tool for researchers studying the genetics of appearance, it is important to note that human pigmentation is a complex trait influenced by many different genes working in concert, rather than the result of a single genetic change.
Research and Evidence Strength
Current scientific literature identifies SLC45A2 as a major contributor to human pigmentation variation. Genome-wide association studies (GWAS) have consistently linked variants in this gene to differences in skin, hair, and eye color. However, the evidence strength for any single SNP, including rs16897810, can vary depending on the population studied and the specific trait being measured. While some variants in SLC45A2 show very strong statistical associations with light pigmentation in European cohorts, the effect sizes for other markers may be more modest or context-dependent. It is also important to recognize that the relationship between these genetic markers and physical traits is statistical, meaning they describe trends across large groups of people rather than predicting an individual's exact appearance. Because pigmentation is a polygenic trait—meaning it is influenced by many genes—the presence of a specific variant does not guarantee a particular phenotype. Researchers continue to investigate how these variants interact with environmental factors and other genetic markers to shape human diversity.
Population Frequency and Distribution
The distribution of SLC45A2 variants varies significantly across different ancestral groups, reflecting the history of human migration and natural selection. Some variants associated with lighter pigmentation are nearly fixed in European populations, meaning they are present in almost every individual, while remaining rare or absent in African and East Asian populations. This pattern of distribution is a classic example of how genetic markers can track with ancestral geography. For rs16897810, frequency data shows that the prevalence of specific alleles differs markedly between populations. Understanding these frequency differences is crucial for genetic research, as it helps scientists distinguish between variants that are common due to evolutionary history and those that might be associated with specific health traits. When interpreting genetic data, it is essential to consider that these frequencies are population-level averages and do not reflect the diversity found within any single individual or family.
Interpreting Your Genetic Information
Information about your genotype for rs16897810 provides insight into your genetic ancestry and the biological factors that contribute to your physical traits. However, it is important to understand the limitations of this data. Genetic associations with pigmentation are complex and are not diagnostic of any health condition. You cannot use this information to predict your exact skin, hair, or eye color, nor can it be used to determine your risk for skin-related health issues. If you have concerns about skin health, such as sensitivity to sunlight or changes in skin appearance, the most appropriate course of action is to consult a dermatologist or a qualified healthcare provider. They can offer personalized advice based on your clinical history and physical examination, which are far more informative than genetic data alone. Treat your genetic results as a tool for educational curiosity rather than a medical assessment, and always prioritize professional medical guidance for any health-related questions.
How common is this variant?
The frequency of SLC45A2 variants varies significantly by ancestry, with some alleles being nearly fixed in European populations while remaining rare in African and East Asian groups.
Frequently asked questions
Does this variant determine my skin color?
No, this variant does not determine your skin color on its own. Pigmentation is a complex trait influenced by many different genes and environmental factors, and a single SNP only provides a small piece of the puzzle.
Can I use this result to assess my skin cancer risk?
No, you should not use this genetic information to assess your risk for skin cancer. If you have concerns about your skin health or sun sensitivity, please consult a dermatologist for a professional evaluation.
Why is this gene important?
The SLC45A2 gene is important because it produces a protein that helps regulate melanin synthesis in melanocytes. It is considered one of the key genes involved in the natural variation of human pigmentation.
Are these results diagnostic?
No, these results are not diagnostic. They are based on statistical associations observed in large research studies and are intended for educational purposes only.
Sources & further reading
Educational information only, last refreshed 10/10/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This synonymous variant is in high linkage disequilibrium with functional alleles that influence human skin, hair, and eye pigmentation.
This missense variant (p.Phe374Leu) is a major determinant of human skin, hair, and eye pigmentation, showing strong evidence of selection in European populations.
Synonymous marker in the SLC45A2 locus associated with skin reflectance, tanning response, and freckling phenotypes.
This missense variant (p.Phe374Leu) is a key ancestry-informative marker and a classic signature of recent positive selection, strongly associated with skin pigmentation and melanoma risk.
The p.Phe374Leu variant in SLC45A2 is a major determinant of human pigmentation variation, influencing skin, hair, and eye color across global populations.
Promoter-associated regulatory variant implicated in hair and skin pigmentation variation across human populations.