ASIP rs4911466: What Your Genotype Means
The rs4911466 variant is a genetic marker located near the ASIP gene, which plays a key role in human pigmentation. Research indicates this variant is associated with variations in skin tanning sensitivity, freckling, and hair color.
What each genotype means
Typical pigmentation profile
This genotype represents the common version of this regulatory variant. Research suggests this version is associated with a lower likelihood of red hair and freckling compared to the G allele, though individual traits are influenced by many other genetic and environmental factors.
This is the most common genotype in European populations, where the G allele frequency is approximately 0.26.
Increased freckling and tanning sensitivity
Carrying one copy of the G allele is associated with a higher propensity for freckling and increased sensitivity to sun tanning. This variant acts as a regulatory element for the ASIP gene, which influences pigment production, and its effects may interact with other genes like MC1R.
This heterozygous genotype is found in a significant portion of individuals of European ancestry, reflecting the common occurrence of the G allele.
Higher red hair and freckling propensity
Carrying two copies of the G allele is statistically associated with a higher likelihood of red hair, increased freckling, and greater skin sensitivity to sun exposure. Because this variant is intergenic and regulatory, its influence on pigmentation is complex and often depends on epistatic interactions with other genes involved in melanin synthesis.
This genotype is less common than the AA or AG combinations, appearing in a smaller subset of European populations where the minor allele frequency is roughly 0.26.
Understanding the rs4911466 Variant
The rs4911466 variant is a single nucleotide polymorphism (SNP) situated in an intergenic region near the ASIP gene on chromosome 20. In genetics, an intergenic variant is one that lies in the DNA sequence between genes rather than within the protein-coding portion of a gene itself. Despite its location outside of the coding sequence, this variant is frequently studied because it acts as a regulatory marker. It is often identified in genome-wide association studies (GWAS) as a signal that correlates with specific physical traits. Because it is located in a regulatory region, researchers hypothesize that it may influence how the nearby ASIP gene is expressed in skin cells, thereby affecting the production of different types of melanin pigments.
The Role of the ASIP Gene
The ASIP gene encodes the agouti signaling protein, a crucial regulator of human pigmentation. This protein functions as an antagonist to the melanocortin 1 receptor (MC1R), which is a primary switch for determining whether melanocytes produce eumelanin (dark brown or black pigment) or pheomelanin (red or yellow pigment). By binding to MC1R, the agouti signaling protein effectively shifts the balance toward the production of lighter, reddish-yellow pigments. Because of this mechanism, variations in or near the ASIP gene are biologically linked to the spectrum of human hair, skin, and eye color. The gene's influence is part of a complex network of signaling pathways that determine how our skin responds to ultraviolet radiation and how our hair follicles develop their characteristic colors.
Research Associations and Evidence Strength
Scientific research has consistently identified the ASIP locus as a significant contributor to pigmentation-related traits. Studies have linked variants in this region to increased sensitivity to sun exposure, a higher propensity for freckling, and the presence of red hair. The evidence for these associations is considered robust in European populations, where the locus has been repeatedly flagged in large-scale genetic studies. However, the evidence strength for rs4911466 specifically is often categorized as limited in terms of its individual causal impact, as it is frequently studied as part of a broader haplotype or regulatory block. While the statistical association with pigmentation phenotypes is clear, the exact molecular mechanism by which this specific SNP influences ASIP expression remains a subject of ongoing investigation.
Population Frequency and Distribution
The distribution of the rs4911466 variant varies significantly across different ancestral groups. In European populations, the minor allele (G) is relatively common, with a frequency of approximately 0.26. This frequency suggests that a substantial portion of individuals of European descent carry at least one copy of this allele. Because pigmentation traits are polygenic—meaning they are influenced by many different genes working in concert—the presence of this variant does not guarantee a specific physical appearance. Instead, it contributes to the overall genetic background that influences how an individual's skin and hair respond to environmental factors. Genetic studies continue to map these frequencies to better understand the evolutionary history and migration patterns of human populations.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs4911466 provide information about biological predispositions rather than definitive medical outcomes. While this variant is associated with skin sensitivity and pigmentation traits, it is not a diagnostic tool for skin cancer or other health conditions. You cannot use this information to predict your exact skin type or health risk with certainty, as these traits are influenced by a combination of genetics, lifestyle, and environmental exposure. If you have concerns about your skin health, such as changes in moles or sensitivity to the sun, you should consult a dermatologist. Always rely on professional medical advice for health management rather than direct-to-consumer genetic reports, which are intended for educational and informational purposes only.
How common is this variant?
The minor allele (G) of rs4911466 has a frequency of approximately 0.26 in European populations.
Frequently asked questions
Is rs4911466 a cause of skin cancer?
No, rs4911466 is not a direct cause of skin cancer. It is a genetic marker associated with pigmentation traits like sun sensitivity, which is a known risk factor for skin health, but it does not determine disease outcome.
Can I use this SNP to predict my hair color?
While this variant is associated with red hair propensity, hair color is a complex trait influenced by many genes. A single SNP cannot accurately predict your hair color.
What should I do if I have the GG genotype?
The GG genotype is a common genetic variation. You should continue to follow standard sun safety practices, such as using sunscreen and wearing protective clothing, and consult a dermatologist for regular skin checks.
Are these results diagnostic?
No, these results are not diagnostic. They are for educational purposes and reflect statistical associations observed in large population studies, not individual medical predictions.
Sources & further reading
Educational information only, last refreshed 10/13/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Regulatory variant near ASIP associated with eye and hair pigmentation phenotypes in forensic appearance models.
Intronic variant in the ASIP locus associated with skin color variation.
This variant in the ASIP gene is associated with variations in skin pigmentation and photo-aging susceptibility.
A variant in the ASIP gene associated with eye and hair color variation.
Strong eQTL regulating agouti signaling protein expression and correlated with baseline skin pigmentation.
Regulatory variant strongly associated with ASIP transcript levels and skin pigmentation in human epidermal biopsies.