TRAF3IP1 rs3739070: Iris Furrows and Genetic Variation
The rs3739070 variant is a single nucleotide polymorphism located within the TRAF3IP1 gene. Research has associated this genetic marker with normal variation in human iris architectural patterns, specifically the presence and extent of contraction furrows.
What each genotype means
Typical iris furrow pattern
This genotype is associated with normal variation in the presence and extent of contraction furrows in the human iris. Research indicates that variants in the TRAF3IP1 gene, which is involved in neurodevelopmental pathways, may influence these structural patterns in the eye. This association is based on statistical findings in populations of European descent and should be considered a trait-related observation rather than a medical indicator.
This is a common genotype, with the minor allele frequency for this variant reported at approximately 0.40 in European populations and 0.28 in East Asian populations.
Typical iris furrow pattern
This genotype is associated with normal variation in the presence and extent of contraction furrows in the human iris. Research indicates that variants in the TRAF3IP1 gene, which is involved in neurodevelopmental pathways, may influence these structural patterns in the eye. This association is based on statistical findings in populations of European descent and should be considered a trait-related observation rather than a medical indicator.
This is a common genotype, with the minor allele frequency for this variant reported at approximately 0.40 in European populations and 0.28 in East Asian populations.
Typical iris furrow pattern
This genotype is associated with normal variation in the presence and extent of contraction furrows in the human iris. Research indicates that variants in the TRAF3IP1 gene, which is involved in neurodevelopmental pathways, may influence these structural patterns in the eye. This association is based on statistical findings in populations of European descent and should be considered a trait-related observation rather than a medical indicator.
This is a common genotype, with the minor allele frequency for this variant reported at approximately 0.40 in European populations and 0.28 in East Asian populations.
Understanding the Variant
The variant rs3739070 is a single nucleotide polymorphism (SNP) located on chromosome 2. In the context of human genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is situated within the TRAF3IP1 gene, which stands for TRAF3 Interacting Protein 1. Scientists study such variants to understand how subtle differences in our genetic code contribute to the wide range of physical traits observed in the human population. While many SNPs have no observable effect, others are statistically linked to specific phenotypic traits, such as the structural characteristics of the eye.
The Role of TRAF3IP1
The TRAF3IP1 gene provides instructions for producing a protein that plays a role in the cytoskeleton, the internal framework of a cell. This protein is involved in pathways that control essential cellular processes, including neurogenesis, neural migration, and synaptogenesis. Because these pathways are critical for the development of complex tissues, researchers have investigated whether variations in this gene influence the development of iris structures. The iris is a complex tissue with various surface features, such as crypts and contraction furrows, which are formed during development. By studying genes like TRAF3IP1, scientists aim to map the biological mechanisms that dictate the unique architectural patterns of the human iris.
Research and Evidence Strength
The association between rs3739070 and iris contraction furrows was identified through genome-wide association studies (GWAS). Initial research in Australian populations of European descent suggested that this variant accounts for approximately 1.7% of the variation in the extent of iris furrows. However, the strength of this evidence is considered limited and potentially ancestry-specific. Subsequent studies in diverse populations, including East Asian and South Asian groups, have often failed to replicate the same level of significance found in European cohorts. This indicates that while rs3739070 may contribute to iris patterns in some groups, other genetic or environmental factors likely play a more significant role in the development of these features across different global populations.
Population Frequency
The frequency of the alleles associated with rs3739070 varies significantly across different ancestral groups. In European populations, the minor allele frequency is approximately 0.40, making the variant relatively common. In contrast, the frequency is lower in East Asian populations, reported at approximately 0.28. Because iris features are largely population-dependent, these differences in allele frequency highlight the importance of considering genetic background when interpreting trait associations. The variation in how common this SNP is across the globe underscores why a genetic association found in one group may not be observed or may have a different effect size in another.
Interpreting Your Information
It is important to understand that rs3739070 is associated with normal, healthy variation in iris appearance, not with any medical condition or disease. This information is purely educational and relates to the study of human physical traits. You cannot use this information to diagnose any health issues or predict medical outcomes. If you are curious about your own genetic data, remember that physical traits are complex and influenced by a combination of many genes and environmental factors. This variant is not a clinical marker, and its presence or absence does not require any medical action or consultation with a healthcare provider.
How common is this variant?
The minor allele frequency for rs3739070 is approximately 0.40 in European populations and approximately 0.28 in East Asian populations.
Frequently asked questions
Does rs3739070 affect my eye health?
No, rs3739070 is associated with normal variation in the physical appearance of the iris, such as the presence of furrows. It is not linked to any eye diseases or medical conditions.
Can I use this SNP to predict my eye color?
While this SNP is associated with iris surface patterns, it is not a primary determinant of eye color. Eye color is a complex trait influenced by many different genes.
Why do studies show different results for this variant?
Genetic associations can vary between populations due to differences in genetic background and environmental factors. The association with rs3739070 appears to be more prominent in European populations than in others.
Is this variant a medical test?
No, this is not a medical test. It is a genetic marker used in research to understand the biological basis of human physical traits.
Sources & further reading
Educational information only, last refreshed 10/26/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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