OCA2 rs183487020: What Your Genotype Means
The rs183487020 variant is a specific genetic change located within the OCA2 gene. This gene is primarily associated with the regulation of melanin production and is linked to oculocutaneous albinism type 2 as well as natural variations in human eye and skin pigmentation.
What each genotype means
Typical OCA2 pigmentation profile
This genotype represents the most common genetic state for this position in the OCA2 gene. It is associated with standard melanin production and typical eye, hair, and skin pigmentation patterns observed in the general population.
This is the most frequent genotype observed across global populations.
Typical OCA2 pigmentation profile
Carrying one copy of the variant allele is generally not associated with the clinical features of oculocutaneous albinism. OCA2-related albinism typically follows an autosomal recessive inheritance pattern, meaning both copies of the gene usually need to be affected to manifest the condition.
This heterozygous genotype is rare, occurring at a frequency of less than 0.001 in East Asian populations.
Potential OCA2 variant carrier
This genotype indicates the presence of the variant allele on both copies of the OCA2 gene. While this variant is cataloged in the context of OCA2, you should consult with a genetic counselor or clinician to understand if this specific genotype is linked to any clinical pigmentation or vision changes, as many variants in this gene are rare and require clinical correlation.
This homozygous genotype is extremely rare, with a frequency significantly below 0.001 in East Asian populations.
Understanding the rs183487020 Variant
The rs183487020 variant is a single nucleotide polymorphism (SNP) found within the OCA2 gene. In genomics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is cataloged in public databases as part of the ongoing effort to map genetic diversity. Because the OCA2 gene is highly influential in determining how our bodies produce and distribute melanin, researchers monitor variants like rs183487020 to understand their potential impact on biological traits. While many variants in the human genome are neutral, those located in genes critical to pigment synthesis are of particular interest to scientists studying the genetic basis of human appearance and inherited conditions related to pigmentation.
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 our skin, hair, and eyes. The P protein helps regulate the pH levels within melanosomes, the cellular structures where melanin is synthesized. By maintaining an optimal environment, the P protein ensures that melanin production proceeds efficiently. When the OCA2 gene is altered, it can disrupt this process, leading to reduced melanin levels. This is why the gene is central to both common variations in eye color and more significant clinical conditions like oculocutaneous albinism type 2.
Research and Evidence Strength
Current research classifies the evidence linking specific OCA2 variants to pigmentation and albinism as moderate. While the OCA2 gene is well-established as a major determinant of human pigmentation, the functional impact of individual variants like rs183487020 can vary significantly. Scientific studies, including those found in the GWAS Catalog and clinical databases, often investigate how these variants correlate with physical traits. It is important to note that genetic associations are statistical in nature; they describe patterns observed across large groups of people rather than predicting an individual outcome with absolute certainty. Because pigmentation is a complex trait influenced by multiple genes and environmental factors, the presence of a single variant does not guarantee a specific physical appearance or health outcome.
Population Frequency and Distribution
Genetic variants are not distributed equally across all human populations. For rs183487020, current data indicates that it is a rare variant, with a population frequency noted as less than 0.001 in East Asian populations. This low frequency suggests that the variant is not widespread in this specific demographic. In genomics, understanding the frequency of a variant across different ancestral groups is crucial for determining its significance. A variant that is common in one population may be rare or entirely absent in another. Researchers use this information to refine their understanding of human genetic history and to improve the accuracy of genetic studies, ensuring that findings are interpreted within the appropriate context of human diversity.
Interpreting Your Genetic Information
If you encounter information about the rs183487020 variant, it is important to view it as a piece of scientific data rather than a medical diagnosis. Genetic information can be complex, and the presence of a variant does not necessarily imply a health concern. You cannot use this information to diagnose yourself or others with any condition. If you have questions about your genetic profile or concerns regarding pigmentation or vision, the most appropriate step is to consult with a qualified healthcare professional or a genetic counselor. They can provide personalized guidance based on your full medical history and clinical presentation. Always rely on professional medical advice rather than interpreting individual genetic markers in isolation.
How common is this variant?
The rs183487020 variant is rare, with a frequency of less than 0.001 in East Asian populations.
Frequently asked questions
What is the OCA2 gene?
The OCA2 gene provides instructions for making the P protein, which is essential for melanin production in the skin, hair, and eyes. It plays a major role in determining human pigmentation.
Is rs183487020 associated with albinism?
The OCA2 gene is associated with oculocutaneous albinism type 2, but the specific impact of the rs183487020 variant is a subject of ongoing research. It is one of many variants studied in the context of pigmentation.
Can I use this information to predict my eye color?
No. Eye color is a complex trait influenced by many different genes and environmental factors. A single variant like rs183487020 cannot accurately predict your eye color.
Should I be worried if I have this variant?
Genetic variants are common and do not necessarily indicate a health problem. If you have concerns about your health or genetic profile, please consult a healthcare professional.
Sources & further reading
Educational information only, last refreshed 10/10/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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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.
A major genetic determinant of blue vs. brown eye color.
A well-established marker in the OCA2-HERC2 region used to predict blue vs. brown eye color.
This variant in the OCA2 gene is a well-established marker influencing human pigmentation and eye color.