TYR rs1126805: What Your Genotype Means
The rs1126805 variant is a common genetic change located within the TYR gene, which plays a critical role in the production of melanin. This variant is statistically associated with natural variations in human pigmentation, including skin, hair, and eye color.
What each genotype means
Typical pigmentation profile
This genotype represents the common form of the TYR gene variant rs1126805. Research indicates this variant is associated with normal variation in skin, eye, and hair pigmentation, though the specific functional impact of this individual SNP is often studied as part of broader genetic haplotypes.
This is the most common genotype in many global populations, though frequencies vary significantly by ancestry.
Varied pigmentation association
Carrying one copy of the G allele is associated with observed variations in human pigmentation traits. Because this variant is often studied in the context of complex genetic backgrounds, its specific contribution to your individual phenotype may be influenced by other genes involved in melanin synthesis.
This heterozygous genotype is found in a significant portion of European populations, with lower prevalence in African and East Asian groups.
Associated with pigmentation variation
This genotype is associated with differences in skin, hair, and eye pigmentation traits in various studies. While it is a known marker for pigmentation variation, it is not a diagnostic indicator and should be viewed as one of many genetic factors contributing to your physical traits.
This genotype is observed in approximately 25-35% of individuals of European ancestry and is less common in other global populations.
Understanding the rs1126805 Variant
The rs1126805 variant is a single nucleotide polymorphism (SNP) located within the TYR gene. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is classified as a missense mutation, meaning the change in the DNA sequence results in a different amino acid being incorporated into the protein structure. Because this variant is located in a gene responsible for pigment production, researchers have long studied it to understand how subtle changes in our genetic code contribute to the wide spectrum of human physical appearance. It is one of many variants across the human genome that collectively influence the complex traits of pigmentation.
The Role of the TYR Gene
The TYR gene provides instructions for making an enzyme called tyrosinase. This enzyme is essential for the production of melanin, the pigment that gives color to our skin, hair, and eyes. Tyrosinase acts as the rate-limiting enzyme in the melanogenesis pathway, meaning it controls the speed at which melanin is synthesized. By converting the amino acid tyrosine into precursors of melanin, tyrosinase determines the amount and type of pigment produced by specialized cells called melanocytes. Because of its central role, variations in the TYR gene can influence the efficiency of this process, which is why researchers often look to this gene when studying the genetic basis of human pigmentation diversity.
Research and Evidence
Scientific research has identified rs1126805 as a marker associated with pigmentation traits. While the evidence linking this variant to normal variation in skin, hair, and eye color is established in various studies, the strength of this association can be considered limited in terms of its individual predictive power. Pigmentation is a polygenic trait, meaning it is influenced by the combined effects of many different genes, including HERC2, OCA2, and SLC45A2. Therefore, while rs1126805 contributes to the overall genetic landscape of an individual's appearance, it does not act in isolation. Current research continues to explore how this variant interacts with other genetic and environmental factors to shape human physical characteristics.
Population Frequency
The frequency of the rs1126805 variant varies significantly across different global populations. It is most commonly observed in individuals of European ancestry, where it is found in approximately 25% to 35% of the population. In contrast, the variant is significantly rarer in populations of East Asian and African descent. These differences in allele frequency are a common feature of human genetic variation, often reflecting historical patterns of migration, natural selection, and genetic drift. Understanding these population-specific frequencies is crucial for researchers who study the evolution of human traits and the genetic architecture of pigmentation across diverse groups.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs1126805 provide only a small piece of the puzzle regarding your physical traits. Because pigmentation is influenced by a complex interplay of many genes and environmental factors, knowing your genotype for this single SNP cannot accurately predict your specific skin, hair, or eye color. This information is primarily of interest for educational and research purposes rather than for personal health or diagnostic use. If you have questions about your genetic results or how they relate to your health, it is best to consult with a qualified healthcare professional or a genetic counselor who can provide context based on your full genetic and medical history.
How common is this variant?
The rs1126805 variant is common in European populations, appearing in approximately 25-35% of individuals, while it is significantly rarer in East Asian and African populations.
Frequently asked questions
Can this variant predict my eye color?
No, this variant cannot predict your eye color. Pigmentation is a complex trait influenced by many different genes, and rs1126805 only provides a small amount of information regarding your overall genetic makeup.
Is rs1126805 associated with any diseases?
While the TYR gene is associated with conditions like oculocutaneous albinism, rs1126805 is primarily studied as a common variant related to normal variation in pigmentation. It is not typically used as a diagnostic marker for clinical conditions.
Why is the frequency different between populations?
Differences in allele frequencies across populations are common and are often the result of evolutionary processes such as natural selection, genetic drift, and historical migration patterns. These factors have shaped the genetic diversity we see in humans today.
Should I be concerned about my genotype for this SNP?
There is no reason for concern regarding this variant. It is a common genetic marker associated with normal human variation in appearance and is not considered a health risk.
Sources & further reading
Educational information only, last refreshed 10/16/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the tyrosinase gene is associated with oculocutaneous albinism type 1.
This variant (S192Y) in the TYR gene is associated with variations in skin, hair, and eye pigmentation and is a known risk allele for melanoma.
Intronic single-nucleotide variant in the tyrosinase gene associated with variation in human eye color and cutaneous tanning response.
This variant is associated with oculocutaneous albinism type 1B and shows a notable frequency in the admixed American population.
Tyrosinase regulatory variant associated with natural skin pigmentation and freckling.
TYR S192Y alters tyrosinase activity, influencing skin and hair pigmentation.