TYRP1 rs2733832: What Your Genotype Means
The rs2733832 variant is a single nucleotide polymorphism located within the TYRP1 gene. It is primarily associated with natural variations in human pigmentation, including differences in iris and hair color.
What each genotype means
Common pigmentary trait variant
This genotype is associated with variations in iris and hair color as part of the TYRP1 gene region. Research indicates this variant contributes to the complex genetic architecture of human pigmentation, though its individual effect size is considered limited.
This is a common genotype found frequently in European populations.
Common pigmentary trait variant
Carrying one copy of each allele at this position is associated with the natural range of human hair and eye color variation. As an intronic variant, it is thought to influence pigmentation through regulatory mechanisms, though it does not determine these traits on its own.
This heterozygous genotype is commonly observed across European populations.
Common pigmentary trait variant
This genotype is one of the variations identified in studies of pigmentary traits near the TYRP1 gene. While associated with differences in iris and hair color, it is part of a polygenic landscape and should not be viewed as a sole determinant of physical appearance.
This genotype is present at a moderate frequency in European populations.
Understanding the rs2733832 Variant
The rs2733832 variant is a specific genetic change, or single nucleotide polymorphism (SNP), located on chromosome 9. In the human genome, this variant sits within the TYRP1 gene region. Because it is an intronic variant, it does not directly alter the protein sequence produced by the gene. Instead, researchers study such variants to understand how they might influence gene expression or regulation. Geneticists use these markers to map how small differences in our DNA sequence correlate with observable physical traits, known as phenotypes. While rs2733832 is a well-documented marker in genomic databases, it is important to remember that it is just one of many thousands of variants that contribute to the complex, polygenic nature of human physical appearance.
The Role of the TYRP1 Gene
The TYRP1 gene, which stands for Tyrosinase-Related Protein 1, plays a critical role in the melanin biosynthetic pathway. Melanin is the primary pigment responsible for the color of human skin, hair, and eyes. The enzyme encoded by TYRP1 is essential for the proper function of melanosomes, the specialized structures within cells where pigment is produced. Mutations that significantly disrupt the function of this gene can lead to conditions such as oculocutaneous albinism type III, which affects pigmentation levels. However, common variants like rs2733832 are not associated with such conditions. Instead, they are thought to contribute to the normal, healthy range of pigmentation diversity observed across different human populations, acting as subtle regulators rather than primary drivers of pigment production.
Research and Evidence Strength
Scientific research has identified associations between variants in the TYRP1 region and human pigmentation traits, including iris color and hair color. Genome-wide association studies (GWAS) have highlighted this locus as part of the genetic architecture underlying these traits. However, the evidence strength for rs2733832 specifically is considered limited. While it appears in catalogs of pigmentation-related variants, the exact biological mechanism by which this intronic SNP influences phenotype remains a subject of ongoing investigation. It is common for pigmentation traits to be influenced by dozens, if not hundreds, of genetic loci working in concert. Therefore, while rs2733832 is statistically linked to these traits in some studies, it should not be viewed as a sole determinant of an individual's eye or hair color.
Population Frequency and Distribution
The rs2733832 variant is relatively common, particularly among individuals of European ancestry. Data from large-scale genomic projects indicate that the minor allele frequency (MAF) for this variant typically ranges between 0.35 and 0.45 in these populations. This high frequency suggests that the variant has been present and potentially maintained in these populations for a significant period. Because it is so common, it is considered a standard part of the genetic diversity found in many people. It is important to note that genetic associations can vary significantly between different ancestral groups; a variant that shows a strong correlation with a trait in one population may not show the same pattern in another due to differences in genetic background and environmental factors.
Interpreting Your Genetic Information
Information about variants like rs2733832 is primarily educational and intended to help the public understand the science of human genetics. It is important to recognize that this information cannot be used to predict complex physical traits with absolute certainty, nor does it have any diagnostic or clinical utility. Because pigmentation is a polygenic trait influenced by many genes and environmental factors, knowing your genotype for a single SNP provides only a tiny fraction of the picture. If you have questions about your health, skin sensitivity, or any medical concerns related to pigmentation, you should consult with a qualified healthcare professional or a dermatologist. Genetic data should never be used to make medical decisions or to self-diagnose conditions.
How common is this variant?
The rs2733832 variant is common across European populations, with a minor allele frequency typically reported between 0.35 and 0.45.
Frequently asked questions
Does rs2733832 determine my eye color?
No, rs2733832 does not determine your eye color. Eye color is a complex, polygenic trait influenced by many different genes and environmental factors, and this variant is only one of many small contributors.
Is rs2733832 associated with any diseases?
The rs2733832 variant is generally considered non-pathogenic and is not associated with specific diseases. It is primarily studied for its role in normal human pigmentation variation.
Can I use this information to predict my children's hair color?
No, you cannot use this information to predict hair color. Because hair color is determined by the interaction of many genes and environmental influences, a single SNP cannot provide a reliable prediction.
Where can I find more information about TYRP1?
You can find authoritative information about the TYRP1 gene through the NIH Genetic Testing Registry or the MedlinePlus Genetics website. These resources provide detailed summaries of gene functions and associated conditions.
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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This nonsense mutation (c.277C>T, p.Arg93Ter) in TYRP1 is the primary genetic cause of the distinct blonde hair phenotype observed in Melanesian populations.
A variant in the TYRP1 gene associated with variation in iris color and skin tone.
3'-UTR variant in TYRP1 linked to natural variation in human hair color lightening and iris shade.