GWASs Identify Genetic Loci Associated with Human Scalp Hair Whorl Direction

This study conducted a genome-wide association study (GWAS) on 4,099 Chinese individuals to identify genetic loci associated with human scalp hair whorl direction. It identified four genetic loci, with the most significant being 7p21.3, involving the ARL4A gene, which may regulate hair whorl direction through its role in cell polarity. Other loci, such as 14q32.13 and 5q33.2, are linked to genes involved in cranial development, suggesting that tissue growth patterns may affect hair follicle orientation. The study found no associations between hair whorl patterns and neurological diseases but identified a link between HAND1 variants and male-pattern baldness. These findings provide insights into the genetic basis of hair whorl development and its potential mechanisms, highlighting the genetic complexity and potential links to other phenotypic traits.