SLC24A4 rs1289253: What Your Genotype Means
The rs1289253 variant is a common genetic marker located within the SLC24A4 gene region. It is statistically associated with variations in human hair and eye pigmentation, particularly in European populations.
What each genotype means
Typical darker hair and eye predisposition
You carry two copies of the C allele at rs1289253 in the SLC24A4 gene region. In genome-wide association studies, this genotype is statistically correlated with a higher likelihood of darker hair tones (such as brown or black) and darker eye colors relative to T allele carriers. However, human pigmentation is polygenic, meaning multiple other genes like HERC2 and OCA2 also strongly shape your actual appearance.
Found in approximately 25% to 35% of individuals of European ancestry, and represents the vast majority of genotypes in East Asian and African populations.
Intermediate pigmentation tendency
You carry one copy of the T allele and one copy of the C allele at rs1289253. Carrying a single T allele is moderately associated with lighter pigmentation traits, including an increased likelihood of blonde hair and blue or lighter eyes compared to the CC genotype. Because this variant exerts modest individual effect sizes, overall pigmentation is determined by the combined influence of many genetic loci and environmental factors.
Carried by approximately 45% to 50% of people of European descent, but is uncommon in individuals of East Asian or African ancestry.
Elevated blonde hair and blue eye tendency
You carry two copies of the T allele at rs1289253 near SLC24A4. Published genome-wide association studies show that this genotype confers the strongest association at this locus with lighter hair pigmentation, notably blonde hair, and blue or light eye coloration. Pigmentation traits remain complex and multifactorial, so this genotype does not guarantee a specific hair or eye color on its own.
Present in roughly 15% to 25% of individuals of European ancestry, but rare to virtually absent in African and East Asian populations.
Understanding the rs1289253 Variant
The rs1289253 variant is a single nucleotide polymorphism (SNP), which is a variation at a single position in the DNA sequence. This specific SNP is located within the SLC24A4 gene, which stands for Solute Carrier Family 24 Member 4. In the context of human genetics, SNPs like rs1289253 are often studied to understand the biological basis of physical traits. Because this variant is non-coding, it does not change the protein sequence itself but may influence how the gene is regulated or expressed in different tissues. Researchers use large-scale genome-wide association studies (GWAS) to identify these markers and determine how they correlate with observable characteristics, such as pigmentation. It is important to note that while this variant is associated with specific traits, it is only one of many genetic factors that contribute to the complex spectrum of human appearance.
The Role of the SLC24A4 Gene
The SLC24A4 gene encodes a protein that belongs to a family of potassium-dependent sodium/calcium exchangers. These proteins are essential for maintaining the balance of ions within cells, a process that is critical for various physiological functions. In the context of pigmentation, SLC24A4 is known to play a role in the development and function of melanocytes, the cells responsible for producing melanin. Melanin is the primary pigment that determines the color of human skin, hair, and eyes. By regulating ion transport, the SLC24A4 protein helps manage the environment within melanosomes, the specialized organelles where melanin is synthesized. Variations in this gene can influence the efficiency of these processes, which in turn may lead to observable differences in pigmentation levels. Research into this gene family has been instrumental in understanding the genetic architecture of human skin, hair, and eye color variation.
Research and Evidence Strength
The association between the SLC24A4 gene and human pigmentation is well-documented in scientific literature. Multiple genome-wide association studies have consistently identified variants in this region as being linked to hair and eye color. Specifically, rs1289253 has been identified as a marker for these traits. However, the evidence strength for this specific SNP is considered limited in terms of its individual predictive power. Pigmentation is a polygenic trait, meaning it is influenced by the cumulative effect of hundreds of genetic variants across the entire genome, as well as environmental factors. While rs1289253 shows a statistically significant association in large cohorts, it does not act as a sole determinant of eye or hair color. Current research emphasizes that human pigmentation is highly complex, and individual variants typically have small effect sizes when considered in isolation.
Population Frequency and Distribution
The frequency of the T allele for rs1289253 varies significantly across different ancestral groups. In European populations, the T allele is relatively common, with frequencies typically ranging between 0.40 and 0.50. This high prevalence in certain populations is why the variant is frequently highlighted in studies focusing on European pigmentation traits. In contrast, the frequency of this allele is generally lower in non-European populations. Understanding these frequency differences is crucial for researchers, as it helps explain why certain genetic associations are more easily detected in specific ancestral groups. Because genetic architecture can differ between populations, findings from one group cannot always be directly applied to another. The study of such variants across diverse populations remains a key area of interest for human evolutionary genetics and the broader understanding of human diversity.
Interpreting Your Genetic Information
If you have received information about your rs1289253 genotype, it is important to view it as a piece of a much larger, complex puzzle. This variant is associated with normal human variation in pigmentation and is not a diagnostic tool for any medical condition. You cannot use this information to predict your physical traits with certainty, nor does it provide information about health risks. Genetic associations are statistical observations made across large groups of people and do not necessarily reflect the outcome for any single individual. If you have questions about your genetic data or how it relates to your health, the best course of action is to consult with a qualified healthcare professional or a genetic counselor. They can provide context and help you understand the limitations of current genetic testing in the context of your personal health history.
How common is this variant?
The T allele frequency is approximately 0.40–0.50 in European populations, with lower frequencies observed in non-European groups.
Frequently asked questions
Does the rs1289253 variant determine my eye color?
No, this variant does not determine your eye color. While it is statistically associated with eye color variation, eye color is a complex trait influenced by many different genes and environmental factors.
Can I use this SNP to predict my child's hair color?
No, you cannot use this SNP to predict a child's hair color. Pigmentation is polygenic, and the inheritance patterns are too complex to be predicted by a single genetic marker.
Is rs1289253 linked to any health conditions?
There is no evidence that this variant is linked to health conditions. It is primarily studied for its association with normal human physical traits like pigmentation.
Why do different populations have different frequencies of this SNP?
Differences in allele frequencies across populations are often the result of evolutionary history, including natural selection and genetic drift. These processes have shaped the genetic diversity observed in humans today.
Sources & further reading
Educational information only, last refreshed 10/12/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Genomic variant associated with human pigmentation traits, specifically hair and eye color variation.
Intergenic regulatory variant associated with hair and eye color pigmentation variation in European ancestry populations.
Variant in the SLC24A4 locus strongly linked to blond versus brown hair color and eye pigmentation variation.
Variant near SLC24A4 associated with human hair and eye color pigmentation.
This intergenic variant near the SLC24A4 and KITLG locus is strongly associated with normal variation in human pigmentation, specifically determining blue versus brown eye color and hair color.
Variant in the SLC24A4 region strongly associated with natural blonde hair color and skin pigmentation variation.