HERC2 rs1667392: Understanding Its Role in Pigmentation Genetics
The rs1667392 variant is a genetic marker located within the HERC2 gene. It is primarily studied for its association with human pigmentation traits, specifically eye color, due to its proximity to the functional regulatory region of the OCA2 gene.
What each genotype means
Typical brown eye pigmentation
You carry two copies of the common C allele at rs1667392. In genome-wide association studies, this genotype tracks with alleles in the nearby HERC2-OCA2 regulatory region that promote normal melanin production in the iris and hair follicles. Research links this profile most frequently to darker iris pigmentation, such as brown eyes, though your final eye color depends on several interacting genes.
Carried by approximately 60% to 65% of people globally, though it is less frequent in populations of Northern and Western European ancestry.
Intermediate pigmentation association
You carry one copy of the C allele and one copy of the T allele at rs1667392. Because this variant is in linkage disequilibrium with causal regulatory variants modulating OCA2 expression, carrying one T allele is modestly correlated with lighter pigmentation shades, such as green, hazel, or lighter brown eyes. However, eye and hair color are complex polygenic traits, so this single genetic marker cannot definitively predict your appearance.
Carried by roughly 30% to 35% of people in European-ancestry populations and approximately 25% to 30% of individuals globally.
Light eye pigmentation tendency
You carry two copies of the T allele at rs1667392. Published literature shows that this genotype frequently co-occurs with the major regulatory variant rs12913832 that down-regulates OCA2 transcription in the iris, which is strongly associated with lighter eye colors such as blue or green. Evidence for rs1667392 itself is limited to statistical linkage rather than direct causation, so it serves only as a probabilistic marker.
Found in about 4% to 8% of people worldwide, but occurs in up to 15% to 20% of individuals in Northern European populations.
What is rs1667392 and Where is it Located?
The variant rs1667392 is a single-nucleotide polymorphism (SNP) situated within the HERC2 gene on chromosome 15. In the context of human genetics, this region is highly significant because it sits in close proximity to the OCA2 gene, which is a major driver of human pigmentation. While rs1667392 is an intronic variant, meaning it does not code for a protein itself, it is frequently analyzed alongside other nearby variants. Research indicates that rs1667392 exists in a region of the genome characterized by complex linkage disequilibrium, where multiple genetic markers are often inherited together. This makes it a useful tool for researchers mapping the genetic architecture of physical traits, as it serves as a proxy for understanding the broader regulatory landscape of the HERC2-OCA2 locus.
The Role of the HERC2-OCA2 Region
The HERC2 gene is a large, complex gene that performs various functions in human cells. However, its most famous contribution to human biology is its role in regulating the expression of the neighboring OCA2 gene. The OCA2 gene provides instructions for making a protein that is critical for the development of melanosomes, the structures in cells that produce and store melanin. Melanin is the pigment that determines the color of our skin, hair, and eyes. When the regulatory elements within HERC2 are altered, it can change how much OCA2 protein is produced. This modulation of OCA2 expression is a primary mechanism by which human eye color variation occurs, shifting the balance between darker and lighter pigmentation phenotypes.
Research Associations and Evidence Strength
Scientific research has identified rs1667392 as one of several candidate signals within the HERC2-OCA2 region associated with eye color variation. While the SNP rs12913832 is widely recognized as the primary functional enhancer for OCA2, rs1667392 is often identified in genome-wide association studies (GWAS) as being in linkage disequilibrium with these primary signals. The evidence for rs1667392 specifically is considered limited in terms of direct functional impact compared to its neighbors. Most studies treat it as a marker that helps refine the genetic map of the region rather than a direct cause of pigmentation changes. Because eye color is a polygenic trait influenced by many different genes and environmental factors, the predictive power of any single SNP like rs1667392 is modest and should be viewed as part of a larger, complex genetic puzzle.
Population Frequency and Distribution
The frequency of genetic variants in the HERC2-OCA2 region varies significantly across different global populations. The derived alleles in this region, which are associated with lighter pigmentation, are found at high frequencies in European populations. Because rs1667392 is linked to these common regulatory patterns, its distribution often mirrors the patterns of eye color diversity observed in these groups. It is important to note that genetic studies have historically focused heavily on European cohorts, which may limit our understanding of how this specific variant behaves in other ancestral groups. As more diverse genomic data becomes available, researchers continue to refine the frequency estimates for this variant to better understand its prevalence and its specific associations across the global human population.
What This Information Means for You
Understanding your genotype for a variant like rs1667392 provides a glimpse into the complex genetic factors that contribute to human physical traits. However, it is essential to recognize that this information is primarily for educational and research purposes. Because eye color and other pigmentation traits are influenced by a combination of many genes and environmental factors, a single SNP cannot provide a definitive prediction of your physical appearance. This information does not have clinical diagnostic value, nor does it indicate health risks. If you are interested in learning more about your genetic makeup, consider discussing your results with a qualified genetic counselor who can help put these findings into the proper context. Always remember that your genetic data is only one part of the story of who you are.
How common is this variant?
The variant shows a high frequency of the derived allele in European populations, reflecting the strong selection pressure on the HERC2-OCA2 region.
Frequently asked questions
Does rs1667392 determine my eye color?
No, rs1667392 is just one of many genetic markers in the HERC2-OCA2 region that contribute to eye color. While it is associated with pigmentation, eye color is a complex trait influenced by multiple genes and environmental factors.
Is rs1667392 a health-related variant?
There is no evidence that rs1667392 is associated with health conditions or diseases. It is primarily studied as a marker for physical traits like eye color.
Why is this variant in the HERC2 gene if it affects eye color?
The HERC2 gene contains regulatory elements that control the expression of the nearby OCA2 gene. Changes in these regulatory regions can influence how much pigment is produced in the iris.
Can I use this information to predict my child's eye color?
Genetic testing for a single SNP like rs1667392 is not a reliable way to predict eye color. Eye color inheritance is polygenic and involves many different genetic interactions.
Sources & further reading
Educational information only, last refreshed 10/18/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is located in an intron of HERC2 and acts as a major regulatory marker for OCA2 expression, strongly influencing human eye color variation.
A well-documented marker in the HERC2/OCA2 region strongly associated with blue vs. brown eye color variation.
Intronic regulatory modifier in HERC2 acting as an enhancer upstream of OCA2 to fine-tune human iris pigmentation and hair shade traits.
A non-coding variant in the HERC2 regulatory region that modulates OCA2 expression and eye color.
Variant in the HERC2-OCA2 regulatory locus significantly associated with iris pigmentation and blue versus non-blue eye color variation.
Strongly determines human eye color; the C allele is associated with blue eye color and the T allele with brown eye color via long-range regulation of the OCA2 promoter.