PAX3 rs3403289: Understanding Your Genetic Facial Shape Variant
The rs3403289 variant is a single-nucleotide polymorphism located within the PAX3 gene. It is primarily studied for its statistical association with normal variations in human facial morphology, particularly the structure of the nasal root.
What each genotype means
Typical nasal root morphology
This genotype is associated with normal-range variation in facial structure, specifically regarding the shape and position of the nasal root. Research indicates that common variants in the PAX3 gene contribute to subtle differences in craniofacial development, though these effects are minor and occur within the spectrum of healthy human appearance.
Frequency varies significantly by ancestry, as this variant shows different allele distributions across global populations.
Typical nasal root morphology
This genotype is associated with normal-range variation in facial structure, specifically regarding the shape and position of the nasal root. Research indicates that common variants in the PAX3 gene contribute to subtle differences in craniofacial development, though these effects are minor and occur within the spectrum of healthy human appearance.
Frequency varies significantly by ancestry, as this variant shows different allele distributions across global populations.
Typical nasal root morphology
This genotype is associated with normal-range variation in facial structure, specifically regarding the shape and position of the nasal root. Research indicates that common variants in the PAX3 gene contribute to subtle differences in craniofacial development, though these effects are minor and occur within the spectrum of healthy human appearance.
Frequency varies significantly by ancestry, as this variant shows different allele distributions across global populations.
What is the rs3403289 Variant?
The rs3403289 variant is a specific genetic change, or single-nucleotide polymorphism (SNP), located on the long arm of chromosome 2. This region contains the PAX3 gene, which is essential for early embryonic development. In the context of genomics, a SNP represents a variation at a single position in the DNA sequence among individuals. Researchers identify these variants by comparing the DNA of large groups of people to see if specific genetic letters correlate with physical traits. The rs3403289 marker is one of several variants within the PAX3 locus that has been highlighted in genome-wide association studies (GWAS) for its potential role in influencing how facial features, such as the nasal root, develop in the general population.
The Role of the PAX3 Gene
The PAX3 gene provides instructions for making a protein that acts as a transcription factor. Transcription factors are proteins that bind to specific regions of DNA to help control the activity of other genes. During development, PAX3 is particularly active in neural crest cells, which are a specialized group of cells that migrate throughout the embryo to form various tissues, including the bones and cartilage of the face and skull. Because of its critical role in craniofacial development, rare and severe mutations in PAX3 are known to cause conditions like Waardenburg syndrome, which can affect hearing and pigmentation. However, common variants like rs3403289 are distinct from these rare mutations; they are associated with the subtle, normal-range differences in facial shape seen across the healthy human population.
Research and Evidence Strength
The evidence linking rs3403289 to facial shape is considered moderate and is derived from large-scale GWAS. These studies analyze thousands of individuals to find statistical correlations between genetic markers and 3D facial measurements. Research has consistently identified the PAX3 region as a hotspot for facial morphology, with rs3403289 specifically showing nominal significance in studies examining facial shape variation. It is important to note that while these associations are statistically significant, they explain only a small fraction of the total variation in human facial appearance. Facial shape is a complex, polygenic trait, meaning it is influenced by the combined effects of many different genes, environmental factors, and their interactions. Therefore, this single variant does not determine a person's face, but rather contributes a very small influence to specific structural features.
Population Frequency
The frequency of the rs3403289 variant is variable across different global populations. Genetic studies often observe that the prevalence of specific alleles can differ significantly between ancestral groups, which is a common finding in human genomics. Because this variant is associated with normal-range facial traits, its distribution is widespread, but the specific allele frequencies are not uniform. Researchers often account for these population differences when conducting studies to ensure that the observed associations are robust and not simply a result of population structure. If you are interested in your own genetic data, you may find that your frequency for this variant aligns with the typical patterns observed in your ancestral background, though this information is primarily of interest for understanding human biological diversity.
Interpreting Your Genetic Information
It is important to understand that information about variants like rs3403289 is intended for educational and research purposes only. This variant is associated with normal, healthy variation in facial features and is not a diagnostic tool for any medical condition. You cannot use this information to predict your appearance or to assess your health status. If you have concerns about your physical development, hearing, or any other health-related issues, you should consult with a qualified healthcare professional or a genetic counselor. They can provide context based on your personal and family medical history, which is far more informative than any single genetic marker. Always approach direct-to-consumer genetic reports with the understanding that they represent statistical probabilities rather than definitive biological outcomes.
How common is this variant?
The frequency of the rs3403289 variant is variable across different ancestral populations, reflecting the natural diversity of the human genome.
Frequently asked questions
Does rs3403289 determine my facial features?
No, this variant does not determine your facial features. It is only one of many genetic factors that contribute a very small, statistical influence to normal facial shape variation.
Is rs3403289 linked to any diseases?
No, rs3403289 is associated with normal-range facial variation. While rare, severe mutations in the PAX3 gene can cause conditions like Waardenburg syndrome, this common SNP is not a cause of such disorders.
Can I use this information to predict how my children will look?
No, you cannot use this information to predict the appearance of children. Facial development is an extremely complex process influenced by thousands of genes and environmental factors.
Why do studies show different results for this variant?
Different studies may show varying results due to differences in population ancestry, sample sizes, and the specific facial measurement techniques used by researchers.
Sources & further reading
Educational information only, last refreshed 10/31/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Intronic variant in PAX3 associated with normal variation in human facial morphology, specifically nasion position and nasal root protrusion.
Significantly correlates with upper facial shape variation, specifically nasion position and forehead projection.
Associated with normal variation in human facial morphology, specifically upper lip positioning and philtrum contouring.
Variant in the PAX3 region significantly associated with nasion position and variation in normal human facial profile morphology.
This variant is associated with facial morphology and is located in a gene known for its role in craniofacial development.
Discovered in genome-wide association analysis of large-effect single-gene variants influencing eye and peri-orbital morphology.