rs11803731, a SNP in the Trichohyalin gene (TCHH) gene, is estimated to account for 6% of the variance in hair morphology (ie hair curliness) based on a study of Australians of European ancestry.[PMID 19896111]
10.1038/ncomms10815 A genome-wide association scan in admixed Latin Americans identifies loci influencing facial and scalp hair features
||Common Variants in the Trichohyalin Gene Are Associated with Straight Hair in Europeans
||6.11 [NR] % variance
[PMID 20585627] Web-based, participant-driven studies yield novel genetic associations for common traits.
[PMID 26414620] Evaluation of the predictive capacity of DNA variants associated with straight hair in Europeans