Those irritating grey hairs may now have a permanent solution as researchers have found a DNA that is responsible for turning hair grey. They found it after analyzing DNA of thousands of people from five Latin America countries. The gene is IRF4, which is responsible for regulating melanin.

The study has been published in the journal Nature Communications. It involved DNA testing of more than 6,300 men and women from Brazil, Colombia, Chile, Mexico and Peru. Through the research, the researchers were able to identify the DNA responsible for changing hair color to grey. With this new discovery, may be in future, a treatment would make its way into people’s life, which would either reverse or prevent graying. The DNA is already associated with pale hair.

People all around the world suffer from grey hair, and lots of money is spent on dying hair back to natural color. According to Andres Ruiz-Linares, one of the researchers involved in the study, certain version of genes predispose people to graying hair, there are other factors despite genes, such as stress or experiencing a traumatic event, which impact graying hair.

"Personally I don't have much of a view regarding the social response to hair graying, but I find it an interesting model to study aging in general," said Desmond Tobin, a hair follicle and pigmentation biologist at Britain's University of Bradford.

The study has also identified DNA leading to other hair traits, such as curliness, beard thickness, eyebrow thickness and predisposition unibrow or monobrow.