Hair Texture: What Your DNA Says
Straight, wavy, or curly hair is determined by the shape of the hair follicle, which is genetically programmed.
Hair Texture is a physical characteristic shaped by many genes of small effect rather than a single switch. Twin and family studies show that most physical traits are substantially heritable, yet no individual variant determines the outcome on its own — your result reflects how your particular combination of alleles compares with the reference population.
Key Genes Behind Hair Texture
Scientists have identified specific genetic variants that influence hair texture. While most traits are shaped by a combination of multiple genes and environmental factors, the following genes play particularly important roles:
TCHHEDARFGFR2TCHHTCHH (trichohyalin) is a structural protein of the hair follicle; variants are a major determinant of straight versus curly hair.
EDAREDAR V370A, common in East Asian and Native American populations, influences hair thickness, tooth shape and sweat-gland density.
FGFR2FGFR2 signalling shapes skin and breast development; variants are linked to acne susceptibility and breast-cancer risk.
How Genetics Influence Hair Texture
Your DNA contains instructions that shape hair texture through variations in protein structure, enzyme activity, and gene expression levels. Small differences in your genetic code, known as single nucleotide polymorphisms (SNPs), can alter how your body develops and functions in ways that affect this trait.
For hair texture, the interplay between genetic variants and environmental factors like diet, lifestyle, and exposure history determines your individual outcome. Some people carry variants that strongly push toward one expression of the trait, while others have a more balanced genetic profile where environment plays a larger role.
Genetic analysis provides insight into your predispositions, but does not guarantee a specific outcome. Traits are complex, and your unique combination of genetics and life experience shapes who you are.
How GenomeInsight Analyzes Hair Texture
GenomeInsight examines your raw DNA data from services like 23andMe, AncestryDNA, or whole-genome sequencing (VCF files) to identify genetic variants linked to hair texture. All analysis runs entirely in your browser, so your genetic data never leaves your device.
For each relevant SNP, GenomeInsight reports your genotype, the trait-associated alleles, published research findings, and how your genetic profile compares to the general population. Results are presented with clear visualizations and easy-to-understand explanations.
Frequently Asked Questions About Hair Texture
Which genes influence hair texture?
The variants most associated with hair texture lie in or near TCHH, EDAR, FGFR2. Each contributes a small effect, and your result reflects the combined picture across these markers plus the ancestry-matched reference frequencies in your raw data file.
Is hair texture purely genetic?
No. Genetics contributes a measurable share of the variation in physical traits traits, but environment, lifestyle and chance do the rest. A predisposition is a statistical nudge, not a verdict — use it as a starting point for observation, not a fixed outcome.
What DNA data do I need for this result?
Any standard raw-data file from 23andMe, AncestryDNA, MyHeritage or similar genotyping services contains the relevant markers. Upload the file and this result — together with 30 free traits — is computed locally in your browser; your file never leaves your device.
Traits That Share Genes With Hair Texture
The same genes often influence more than one trait. These traits overlap genetically with hair texture:
Sources & Further Reading
The associations described on this page come from published genome-wide association studies and curated public genomic databases. Explore the primary sources for each gene:
Explore Related Traits
Eye Color
Your DNA influences whether your eyes are blue, green, brown, or hazel through pigment production in the iris.
Hair Color
Genetic variants determine the ratio of eumelanin to pheomelanin, producing hair ranging from black to blonde to red.
Skin Pigmentation
Multiple genes control the amount and type of melanin in your skin, affecting how light or dark your complexion is.
Height
Height is one of the most polygenic traits, influenced by hundreds of genetic variants along with nutrition and environment.
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