New research shows that all blue-eyed people are the descendants of one single human who lived thousands of years ago. as scientists delve deeper into areas such as research on brain aging and sons, they uncover fascinating links between genetics and cognitive decline. This emerging field aims to identify how hereditary factors may influence brain health in later years. The implications of these findings could transform our understanding of aging and open new avenues for preventative care.
Although blue is the second most common eye color among humans in the world, it is still uncommon as compared to the usual black and brown, and only 8-10% of people have blue eyes.
But how did this mutation occur? Well, it is still a genetic mystery.
The exact reason is yet to be determined. Still, according to a group of students from Copenhagen University, a single mutation that occurred nearly 6,000 years ago was responsible for this unique eye color.
“All blue-eyed people have one ancestor in common, born around 6,000 to 10,000 years ago. Blue eyes are caused by a gene mutation. For years, researchers had searched for it on the OCA2 gene. The OCA2 gene determines how much brown pigment is in our eyes. But what they were looking for wasn’t there at all,” Insider wrote.
The team identified a single mutation that occurred by chance in a gene called OCA2 almost 8,000 years ago near the coast of the Black Sea in one single in one human individual.
According to the team leader, Dr. Hans Eiberg,
“The gene does not make blue in the iris; rather, it turns off the mechanism which produces brown melanin pigment. Originally, we all had brown eyes.”
The research involved families that included members with blue and brown eyes (parents and children). These families participated in various eye tests to uncover deeper connections between eye color and personality traits. The study aimed to explore personality insights from eye tests, revealing fascinating correlations that may challenge conventional beliefs. Participants shared their experiences, highlighting how eye color played a role in their interactions and self-perception.
“And families whose irises show blue- and green-spot segregation were excluded; all in all, 100 families were included in the analysis. Out of these, 45 families had at least one individual with brown eyes, and 55 were composed exclusively of blue-eyed members,” quoted ZME Science.
“Two individuals born with heterochromia (who have eyes of different colours) were also included in the analysis. Genetic material from individuals from Turkey and two from Jordan was also used in the study.”
The team then examined participants’ DNA and mitochondrial DNA to determine the mutation that is most likely responsible for blue eyes. They found that this mutation affects an allele known as the OCA2 gene.”
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Sources: Insider – ZME Science
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