However, current research shows that part of the genotype, the EDAR gene, which was selected for because of its role in nutrient transfer in breast milk during the era of the Beringian refugium, also determines the degree to which teeth shovel. In an interview, Dr. Hlusko suggests that human populations who had the trait migrated from Asia to the Americas, thus leaving their genetic trace around the world.
However, modern research demonstrates that a part of the genotype, namely the EDAR gene, which was initially chosen because of its function in nutrient transfer during breast milk in ancient times, also influences tooth shape. Dr. Hlusko's interview implies that human populations with this trait migrated from Asia to the Americas, leaving behind their genetic mark on global populations.