December 12, 2018
The orange hair dough was much more complicated than previously thought.
It was intended that children should be born redheads I was It is necessary for them to inherit two gene copies, called MC1R, one from mother and one from father.
The MC1R It is recessive gene that is that can not manifest itself in the presence of a dominant gene and only when a person receives copies of his or her mother and father.
However Not all people who inherit the MC1R gene are orange hair, the reason why the researchers had noticed that other factors play an important role they did not know before.
Study on University of Edinburgh in the United Kingdom Just proven why the gene is MC1R it only explains part of the dough. This is the largest genetic study that has been done so far with redheads.
About 1 to 2% of the world's population is redhead, but In Scotland, this percentage is close to 13%, which according to the project corresponds to 650 thousand people ScotlandsDNA.
Scientists Edinburgh University they checked almost 350 thousand people of DNA who participated in the British project UK Biobank, which collects information on the health and genome of more than 400 thousand people United Kingdom
When researchers compared the redheads genome with people with brown or black hair, they found it Eight differences related to hair color. And they also found it some genes are controlled when MC1R is expressed or not.
Orange hair not only the result of a recessive gene but from complex interactions between at least eight genes.
In addition, the researchers have been tested nearly 200 gene differences associated with people with blond or dark hair.
There is color gradient from black, dark brown, light brown and light color. And this gradient is which is caused by more and more variants in these 200 genes.
Something that surprised scientists is that many of these genetic differences are not related to pigmentation, but on the hair texture. And other options determine hair growth, that is, whether it's straight or shiny.
"Our work distributes most of the genetic variation that promotes hair color differences"indicated Albert Tenesa, one of the researchers Roslin Institute no Edinburgh University
Real or fake? | 18 red-haired babies were born in a village where the only collarado was a priest