OCA2 rs1800407: What Your Genotype Means
The rs1800407 variant is a well-studied genetic marker located within the OCA2 gene. It is primarily recognized for its association with human eye color variation, specifically influencing the development of green, hazel, and brown eye shades.
What each genotype means
Typical brown eye association
This genotype is the reference form of the variant and is associated with a higher likelihood of brown eye color. Research indicates this genotype acts as a penetrance modifier for other pigmentation genes, and it is less strongly associated with green or hazel eye colors compared to the A allele.
This is the most common genotype observed in most global populations.
Intermediate eye color modifier
Carrying one copy of the A allele (also known as the R419Q variant) may influence the expression of green or hazel eye tones. This genotype serves as a modifier of eye color penetrance, particularly when considered alongside other genetic markers like HERC2.
This genotype is found in approximately 14% of individuals in some European cohorts.
Increased green/hazel association
This genotype, which results in an amino acid change (Arg419Gln), is statistically associated with an increased likelihood of having green or hazel eyes in certain Caucasian populations. It acts as a penetrance modifier for eye color and has also been studied as a potential risk factor for cutaneous malignant melanoma, though individual outcomes vary significantly based on other genetic and environmental factors.
This is the least common genotype, occurring in approximately 1% of individuals in some European populations.
Understanding the rs1800407 Variant
The rs1800407 variant is a single nucleotide polymorphism (SNP) located in exon 13 of the OCA2 gene on chromosome 15. In scientific literature, this variant is frequently referred to as the Arg419Gln mutation because it results in a substitution of the amino acid arginine with glutamine at position 419 of the P protein. This specific change is a missense mutation, meaning it alters the protein's sequence. Because this variant sits within the coding region of the gene, researchers have long investigated how this structural change might influence the function of the P protein and, consequently, the physical traits related to pigmentation. It is one of several variants in the OCA2-HERC2 region that collectively contribute to the wide spectrum of human eye, hair, and skin color observed globally.
The Role of the OCA2 Gene
The OCA2 gene provides the instructions for creating the P protein, which is a melanosomal transmembrane protein. This protein is essential for the proper function of melanocytes, the specialized cells responsible for producing melanin. Melanin is the primary pigment that determines the color of human skin, hair, and eyes. Within the melanosome, the P protein acts as a transporter that helps regulate the environment necessary for melanin synthesis, including the modulation of chloride conductance. When the OCA2 gene functions normally, it supports the production of sufficient melanin to create darker pigmentation. Mutations in this gene can lead to oculocutaneous albinism type II, a condition characterized by significantly reduced melanin production. In the context of normal human variation, subtle differences in the OCA2 gene sequence act as a 'dimmer switch' for melanin, influencing whether an individual has brown, green, or blue eyes.
Research and Associations
Research has consistently linked rs1800407 to eye color, particularly in European populations. Studies suggest that the presence of the (A) allele is associated with increased odds of having green or hazel eyes compared to the (G) allele. However, the genetic architecture of eye color is complex and involves multiple genes. The effect of rs1800407 is often studied in conjunction with other variants, such as those in the neighboring HERC2 gene, which acts as a regulatory switch for OCA2. Some research indicates that rs1800407 may modify the penetrance of eye color phenotypes established by other variants. Beyond pigmentation, some studies have explored potential associations between this variant and skin cancer risks, such as cutaneous malignant melanoma or basal cell carcinoma, though these findings are often nuanced and require consideration of broader genetic and environmental factors.
Population Frequency and Interpretation
The rs1800407 variant is considered common, though its allele frequencies vary significantly across different ancestral populations. The ancestral (G) allele is highly prevalent globally. The derived (A) allele, which is associated with lighter eye colors, is found at higher frequencies in European populations. Because eye color is a polygenic trait—meaning it is influenced by many different genes working together—it is impossible to predict an individual's exact eye color based on this single SNP alone. Genetic testing for this variant provides information about a specific biological marker, but it does not account for the full complexity of human pigmentation. Readers should view this information as a piece of a much larger genetic puzzle rather than a definitive diagnostic tool for physical traits or health outcomes.
What You Can Do With This Information
Understanding your genotype for rs1800407 can be an interesting way to learn about your genetic heritage and the biological basis of human diversity. However, it is important to remember that this information is for educational purposes only. You cannot use this data to diagnose medical conditions or predict complex physical traits with absolute certainty. If you have concerns about your skin health, such as changes in moles or skin lesions, you should consult a dermatologist or a qualified healthcare provider, regardless of your genetic profile. Genetic markers associated with pigmentation are not substitutes for professional medical screenings. Always rely on clinical evaluations for health-related decisions and discuss any questions about your genetic results with a genetic counselor or your primary care physician.
How common is this variant?
The rs1800407 variant is common globally, with the ancestral G allele being the most frequent, while the derived A allele shows higher prevalence in European populations.
Frequently asked questions
Can I predict my child's eye color using rs1800407?
No, you cannot accurately predict eye color using only this variant. Eye color is a complex trait influenced by many different genes, and this SNP is only one of several factors involved.
Is rs1800407 a medical diagnostic test?
No, this variant is not used for medical diagnosis. While some studies explore links to skin cancer risk, these associations are complex and do not replace professional medical screening.
What is the difference between OCA2 and HERC2?
OCA2 is the gene that produces the P protein involved in melanin synthesis. HERC2 is a neighboring gene that contains a regulatory region acting as a switch to control the expression of OCA2.
Why do some people have green eyes?
Green eyes result from a combination of low melanin levels in the iris and the way light scatters in the eye. This is influenced by the cumulative effect of multiple genetic variants, including those in the OCA2 gene.
Sources & further reading
Educational information only, last refreshed 10/2/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This missense variant (p.Ala486Thr) in the OCA2 gene is associated with human pigmentation traits, including eye and skin color variation.
This variant is located within the OCA2 gene, which encodes the P protein essential for melanin production and is a key locus for human pigmentation variation.
Missense variant Arg419Gln strongly linked to intermediate eye color, blue/green iris phenotypes, and lighter pigmentation.
Pigmentation-modifying SNP modulating blue versus brown eye color penetrance and melanin deposition.
Functional non-synonymous variant (Arg419Gln) in OCA2 linked with ancestral pigmentation divergence and lighter eye/skin color.
Common missense variation (Arg305Trp) in OCA2 associated with eye color gradation and lighter skin pigmentation in European populations.