More than a hundred new genes linked to determining hair colour have been revealed in a new large-scale study reported in Nature Genetics

Molecular epidemiologist, Jonas Mengel-From of the University of Southern Denmark, who was not involved in the research, says that self-reporting of hair colour can be subject to a degree of misclassification. Some people, for example, might report their light brown hair as blond. Animal studies have found evidence that pigmentation genetics is sex specific. For example, tortoiseshell-coloured cats are always female, while ginger cats are often male. 

However, it’s possible that the sex difference in hair colour, in the present study, reflects an environmental contribution, he suggests, such as bleaching by the sun, since women tend to grow their hair longer than men.

Periode16. apr. 2018