EDAR rs3827763: Understanding the V370A Genetic Variant
The rs3827763 variant, often referred to as the V370A mutation in the EDAR gene, is a well-studied genetic marker associated with distinct physical traits. It is primarily found in East Asian and Native American populations and is linked to variations in hair thickness, tooth morphology, and sweat gland density.
What each genotype means
Ancestral EDAR genotype
This genotype represents the ancestral state of the EDAR gene. Research indicates that individuals with this genotype are less likely to exhibit the specific ectodermal traits associated with the derived 370A variant, such as increased sweat gland density or shovel-shaped incisors.
This genotype is the most common form in European and African populations, where the derived A allele is nearly absent.
Heterozygous EDAR variant
Carrying one copy of the derived 370A variant (often referred to as the T allele in some databases, corresponding to the Val370Ala change) may result in an intermediate expression of associated traits. These traits include variations in hair thickness, sweat gland density, and tooth shape, though the effect is typically less pronounced than in those with two copies.
This genotype is found at varying frequencies in populations where the 370A variant is present, such as in some Central Asian or admixed groups.
Derived EDAR variant
This genotype corresponds to the homozygous state of the 370A missense variant, which has been strongly associated with specific ectodermal phenotypes. Research links this variant to thicker hair shafts, increased eccrine sweat gland density, and shovel-shaped incisors. These traits are considered adaptive and are highly prevalent in East Asian and Native American populations.
This genotype is very common in East Asian and Native American populations, where the frequency of the 370A allele often exceeds 90%.
What is the rs3827763 Variant?
The rs3827763 variant is a single nucleotide polymorphism (SNP) located within the EDAR gene, which stands for Ectodysplasin A receptor. In scientific literature, this specific change is frequently identified as the V370A missense variant, where a valine amino acid is replaced by an alanine at position 370 of the protein sequence. This change occurs in the intracellular death domain of the receptor. Because this variant is a missense mutation, it alters the protein's structure, which can influence how the receptor functions during the development of ectodermal tissues. These tissues give rise to structures such as hair, teeth, and sweat glands. The variant is considered a classic example of a genetic change that has undergone positive selection in specific human populations, meaning it likely provided an evolutionary advantage in the environments where it became common.
The Role of the EDAR Gene
The EDAR gene provides instructions for creating a protein that acts as a receptor for ectodysplasin A, a signaling molecule essential for the proper development of ectodermal structures. During embryonic development, the EDAR protein helps regulate the formation and growth of hair follicles, sweat glands, and teeth. By activating the NF-κB signaling pathway, the EDAR protein ensures that these structures develop in the correct size, shape, and density. When the V370A variant is present, research suggests it may enhance the activation of this signaling pathway. This gain-of-function effect is thought to be the underlying mechanism that leads to the physical traits observed in individuals carrying the variant, such as thicker hair shafts and a higher density of eccrine sweat glands. Because the gene is so fundamental to early development, its regulation is tightly controlled across all human populations.
Research and Associations
Scientific research has consistently associated the V370A variant with several specific physical traits. Studies have linked the derived allele to the presence of shovel-shaped incisors, which are a common dental characteristic in many East Asian populations. Additionally, the variant is associated with increased hair shaft thickness and a higher density of eccrine sweat glands. While these associations are statistically significant, it is important to note that the evidence strength for these traits is considered limited in terms of clinical diagnostic utility. The variant does not cause a disease or disorder; rather, it contributes to normal human phenotypic variation. Recent studies have also explored potential links between this variant and subtle differences in facial and ear morphology, suggesting that the influence of the EDAR gene on development may be broader than previously understood. As with all genetic traits, these associations are based on population-level data and do not predict individual outcomes with absolute certainty.
Population Frequency
The distribution of the rs3827763 variant is highly ancestry-specific. The derived allele is found at very high frequencies in East Asian and Native American populations, often exceeding 90% in some groups. Conversely, the variant is nearly absent in populations of European and African descent. This striking difference in frequency is a hallmark of positive natural selection, suggesting that the variant may have been beneficial in the ancestral environments of East Asian and Native American populations. Because the variant is so common in these groups, it is considered a normal part of their genetic diversity rather than a rare mutation. Understanding this distribution is crucial for researchers studying human evolution and the genetic basis of physical traits, as it highlights how environmental pressures can shape the genetic landscape of different human populations over thousands of years.
Interpreting Your Genetic Information
If you have received information about your status for the rs3827763 variant, it is important to view it as a reflection of your ancestral heritage and natural physical variation. This variant is not a medical diagnostic tool, and it does not indicate the presence of a health condition. The traits associated with this SNP, such as hair thickness or tooth shape, are complex and influenced by many other genes and environmental factors. You cannot use this information to diagnose yourself or to make medical decisions. If you have questions about your physical traits or concerns about your health, the best course of action is to consult with a qualified healthcare professional or a genetic counselor. They can provide context based on your full medical history and help you understand how genetic information fits into your overall health picture.
How common is this variant?
The G allele frequency is greater than 0.90 in East Asian and Native American populations, while it is near 0 in European and African populations.
Frequently asked questions
Is the EDAR V370A variant a disease-causing mutation?
No, the EDAR V370A variant is not a disease-causing mutation. It is a common genetic variation associated with normal physical traits like hair thickness and tooth shape.
Can I use this variant to predict my hair type?
While the variant is associated with hair thickness, hair type is a complex trait influenced by many different genes and environmental factors. This single variant cannot provide a complete prediction of your hair characteristics.
Why is this variant so common in some populations but not others?
The high frequency of this variant in East Asian and Native American populations is likely due to positive natural selection. This suggests that the variant may have provided an evolutionary advantage in the environments where these populations lived.
Should I be concerned if I have the GG genotype?
There is no reason for concern if you have the GG genotype. It is a normal genetic variation that is highly common in many parts of the world and is not linked to any medical conditions.
Sources & further reading
Educational information only, last refreshed 9/25/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Functional variant tightly linked to hair shaft thickness, sweat gland density, and distinct East Asian dental morphology traits.
Functional variant (V370A) in the EDAR gene influencing hair thickness and sweat gland density.
Non-coding regulatory variant in EDAR associated with variations in hair fiber thickness, crown morphology, and dental traits.
Intronic regulatory variant tightly linked to hair follicle density, incisor shoveling morphology, and sweat gland branching in continental Asian populations.
Common regulatory variant in the EDAR region associated with variation in human hair thickness, beard density, and facial shape.
Functional variant in EDAR associated with hair fiber diameter and dental morphology.