SLC24A5 rs2470893: Understanding Pigmentation Genetics
The SLC24A5 gene plays a central role in human skin pigmentation by regulating the production of melanin. The variant rs2470893 is a genetic marker located within this gene region that researchers study to understand the biological basis of skin color variation across different global populations.
What each genotype means
Associated with lighter skin
This genotype is associated with reduced melanin production in melanocytes, which contributes to lighter skin pigmentation. Research indicates this variant acts as a hypomorphic alteration that influences human pigmentation patterns, particularly in European populations.
This genotype is nearly fixed in European populations and is found at varying frequencies in South Asian and admixed populations.
Intermediate pigmentation association
Carrying one copy of each allele is associated with an intermediate effect on skin pigmentation compared to homozygous states. This genotype reflects the genetic contribution of the SLC24A5 locus to the spectrum of human skin color variation.
This heterozygous genotype is commonly observed in populations with recent admixture between European and non-European ancestral groups.
Associated with darker skin
This genotype is the ancestral state and is associated with higher levels of melanin production compared to the alternative allele. It is a primary contributor to the genetic architecture of skin pigmentation in populations of African and other non-European ancestries.
This genotype is the predominant form in African populations and is rare in populations of European ancestry.
What is the rs2470893 Variant?
The rs2470893 variant is a single nucleotide polymorphism (SNP) located on chromosome 15 within the SLC24A5 gene region. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. While the human genome is remarkably similar across all people, these small variations can influence physical traits. Researchers track these specific markers to map how certain traits, such as skin pigmentation, are inherited and distributed. Because rs2470893 is situated in a region known for its influence on melanogenesis—the process of producing melanin—it serves as a key point of interest for scientists studying the evolutionary history of human skin color. It is important to note that this variant is one of many genetic factors that contribute to the complex, polygenic nature of human pigmentation.
The Role of the SLC24A5 Gene
The SLC24A5 gene encodes a protein known as NCKX5, which functions as a cation exchanger. This protein is primarily located in the membranes of melanosomes, the specialized organelles within cells where melanin is synthesized and stored. By transporting ions like calcium and potassium, NCKX5 helps maintain the internal environment necessary for the maturation of melanosomes and the efficient production of eumelanin, the pigment responsible for darker skin, hair, and eye tones. When the function of this protein is altered, it can lead to changes in the amount or type of melanin produced. Research in model organisms, such as zebrafish, first highlighted the importance of this gene in pigmentation, and subsequent human studies have confirmed its significant impact on the variation of skin phototypes observed globally.
Research and Population Associations
Scientific research has consistently identified the SLC24A5 region as a major contributor to skin pigmentation differences. Studies, including genome-wide association studies (GWAS), have shown that variants in this gene account for a significant portion of the variance in skin color, particularly when comparing European populations to African and East Asian populations. While rs2470893 is a marker of interest, it is often studied alongside other functional variants like rs1426654, which is known to have a large effect on pigmentation. The evidence for the gene's role is strong, though the specific contribution of individual SNPs can vary depending on the ancestral background of the population being studied. Because pigmentation is a complex trait influenced by many genes and environmental factors, these genetic associations provide a statistical framework for understanding human diversity rather than a definitive prediction of an individual's physical appearance.
Understanding Your Genetic Information
Information regarding genetic variants like rs2470893 is primarily used for educational and research purposes to understand human evolutionary biology and the genetic architecture of physical traits. It is important to recognize that genetic markers are not diagnostic tools for health conditions, nor do they determine an individual's identity. If you have received genetic testing results, they should be interpreted in the context of your overall health and ancestry. Because this variant is associated with a normal human trait—pigmentation—it does not carry medical implications for disease risk or medication response. If you have questions about your genetic data or how it relates to your health, you should consult with a qualified healthcare provider or a genetic counselor who can provide personalized guidance based on your specific clinical history and needs.
How common is this variant?
The SLC24A5 gene region is highly differentiated across populations, with specific alleles reaching near-fixation in European populations while remaining at lower frequencies in other ancestral groups.
Frequently asked questions
Is rs2470893 a test for skin cancer risk?
No, rs2470893 is a marker associated with normal variation in skin pigmentation. It is not a diagnostic test for skin cancer or any other medical condition.
Does this variant determine my exact skin color?
No, skin color is a complex polygenic trait influenced by many different genes and environmental factors. A single SNP cannot determine or predict an individual's skin color.
Why is this gene important in human evolution?
The SLC24A5 gene is considered a key locus in human evolution because variations in this gene have been under strong selective pressure as human populations migrated to different environments with varying levels of ultraviolet radiation.
Can I change my genotype for this variant?
No, your genotype is determined at conception and remains constant throughout your life. It is a part of your inherited genetic blueprint.
Sources & further reading
Educational information only, last refreshed 10/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs2470893?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in SLC24A5
This SNP is a primary determinant of human skin pigmentation variation globally.
Regulatory variant in the SLC24A5 locus associated with skin pigmentation variation.
Lesser-studied regulatory variant linked to human skin pigmentation gradations and melanogenesis.
Coding variant in SLC24A5 strongly associated with skin pigmentation and melanin distribution.
Non-coding regulatory SNP in strong linkage disequilibrium with Ala111Thr, regulating melanocytic gene expression and skin lightness traits.
A coding variant (Ala111Thr) in SLC24A5 that is a major determinant of human skin pigmentation differences between European and African populations.