SLC45A2 rs26722: Understanding Your Pigmentation Genetics
The rs26722 variant is a specific genetic change located within the SLC45A2 gene. It is statistically associated with natural variations in human skin, hair, and eye pigmentation.
What each genotype means
Typical pigmentation profile
This genotype is considered the common or reference state for this variant. Research suggests that individuals with this genotype are more likely to exhibit standard pigmentation levels for their ancestral background, as they do not carry the T allele associated with darker pigmentary traits.
This is the most common genotype observed in many populations, particularly those of European ancestry.
Likely darker pigmentation traits
Carrying one copy of the T allele is statistically associated with a tendency toward darker eye, hair, and skin pigmentation compared to those without the allele. This variant contributes to the natural spectrum of human appearance, though individual results vary based on the influence of other genetic and environmental factors.
This genotype is found at moderate frequencies in various populations, though it is less common than the homozygous CC state.
Increased darker pigmentation traits
Individuals with two copies of the T allele are statistically more likely to exhibit darker eye, hair, and skin pigmentation. This association reflects the role of the SLC45A2 gene in regulating melanin production and melanosome function, which influences the depth of pigment in these tissues.
The T allele is relatively rare in many populations, making this homozygous genotype the least common of the three.
What is the rs26722 Variant?
The rs26722 variant is a single nucleotide polymorphism (SNP) located on chromosome 5. In genetics, a SNP represents a variation at a single position in the DNA sequence. Specifically, rs26722 involves a change where the amino acid glutamic acid is replaced by lysine at position 272 of the protein, often referred to as the Glu272Lys substitution. This variant sits within the SLC45A2 gene, which provides the blueprint for a protein involved in the complex biological pathways that determine human pigmentation. Because this change occurs in the coding region of the gene, it has the potential to alter the structure or function of the resulting protein, which in turn may influence how melanin—the primary pigment in human skin, hair, and eyes—is synthesized or transported within specialized cells called melanocytes.
The Role of the SLC45A2 Gene
The SLC45A2 gene, also known as MATP (Membrane-Associated Transporter Protein), encodes a protein that resides within the membranes of melanosomes. Melanosomes are the specialized organelles inside melanocytes where melanin production occurs. While the exact mechanism of the SLC45A2 protein is still a subject of ongoing research, it is widely understood to be essential for the proper maturation and function of these organelles. By facilitating the transport of molecules necessary for melanin synthesis, the SLC45A2 protein acts as a key regulator of pigment density. Variations in this gene are well-documented in scientific literature as contributors to the wide spectrum of human pigmentation observed globally. Beyond normal variation, rare and severe mutations in this same gene are known to cause Oculocutaneous Albinism type 4, a condition characterized by significantly reduced melanin production.
Research and Evidence Strength
The evidence linking rs26722 to pigmentation traits is considered moderate. Numerous genome-wide association studies (GWAS) have identified SLC45A2 as a major locus influencing skin, hair, and eye color, particularly in European and Asian populations. Statistical analyses suggest that the presence of certain alleles at this site correlates with darker pigmentation phenotypes. However, it is important to note that pigmentation is a polygenic trait, meaning it is influenced by the cumulative effect of many different genes, including OCA2, HERC2, and TYR, rather than a single variant. Therefore, while rs26722 contributes to the overall genetic architecture of appearance, it does not act in isolation. The strength of the association can also vary depending on the ancestral background of the population being studied, reflecting the complex evolutionary history of human skin and hair color diversity.
Population Frequency
The frequency of the rs26722 variant varies significantly across different global populations. In European lineages, the minor allele frequency (MAF) is approximately 0.08, though this can fluctuate based on specific regional cohorts. The variant is observed at higher frequencies in certain East Asian lineages. Because human populations have experienced different selective pressures related to ultraviolet radiation exposure throughout history, the distribution of pigmentation-related alleles like those in SLC45A2 is not uniform. Researchers use these frequency differences to study how human traits have adapted to diverse environments over thousands of years. It is common for such variants to be nearly fixed in some populations while remaining polymorphic in others, providing a window into the genetic diversity that defines human appearance.
Interpreting Your Genetic Information
Understanding your genotype for rs26722 provides insight into the genetic factors that contribute to your natural pigmentation. However, it is essential to recognize that genetic markers are only one piece of the puzzle. Phenotypic traits like skin and hair color are the result of a complex interplay between your unique genetic makeup and environmental factors. This information is intended for educational purposes and should not be used to make medical decisions or health assessments. If you have concerns about skin health, such as changes in moles or sensitivity to sunlight, you should consult a dermatologist or a qualified healthcare professional. Genetic testing for appearance-related SNPs cannot predict your exact physical appearance or health outcomes, and it should not be used as a substitute for professional medical advice or clinical evaluation.
How common is this variant?
The rs26722 variant has a minor allele frequency of approximately 0.08 in European populations, with higher frequencies observed in East Asian lineages.
Frequently asked questions
Does rs26722 determine my exact skin color?
No, rs26722 is only one of many genetic variants that influence pigmentation. Skin color is a complex, polygenic trait determined by the interaction of numerous genes and environmental factors.
Can I use this information to predict my child's eye color?
Genetic testing for a single SNP like rs26722 cannot accurately predict a child's eye color. Pigmentation is inherited through complex patterns involving multiple genes, making simple predictions unreliable.
Is rs26722 related to skin cancer risk?
While pigmentation genes are related to how skin reacts to UV light, rs26722 is primarily studied for its role in normal appearance variation. Always consult a dermatologist for concerns regarding skin cancer risk.
What should I do if I have the T/T genotype?
The T/T genotype is a normal variation found in many people. It does not require any medical action, as it is simply a marker associated with natural differences in pigmentation.
Sources & further reading
Educational information only, last refreshed 9/29/2026. 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.
This variant (p.Phe374Leu) is strongly associated with lighter skin, hair, and eye pigmentation, as well as an increased sensitivity to UV-induced skin damage.
The p.Phe374Leu variant in SLC45A2 is a major determinant of human pigmentation variation, influencing skin, hair, and eye color across global populations.