All blue-eyed humans have common ancestor

New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today. “Originally, we all had brown eyes.”New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today.

“Originally, we all had brown eyes”, said Professor Eiberg from the Department of Cellular and Molecular Medicine. “But a genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a “switch”, which literally “turned off” the ability to produce brown eyes”. The OCA2 gene codes for the so-called P protein, which is involved in the production of melanin, the pigment that gives colour to our hair, eyes and skin. The “switch”, which is located in the gene adjacent to OCA2 does not, however, turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris – effectively “diluting” brown eyes to blue. The switch’s effect on OCA2 is very specific therefore. If the OCA2 gene had been completely destroyed or turned off, human beings would be without melanin in their hair, eyes or skin colour – a condition known as albinism.

Variation in the colour of the eyes from brown to green can all be explained by the amount of melanin in the iris, but blue-eyed individuals only have a small degree of variation in the amount of melanin in their eyes. “From this we can conclude that all blue-eyed individuals are linked to the same ancestor,” says Professor Eiberg. “They have all inherited the same switch at exactly the same spot in their DNA.” Brown-eyed individuals, by contrast, have considerable individual variation in the area of their DNA that controls melanin production.

Professor Eiberg and his team examined mitochondrial DNA and compared the eye colour of blue-eyed individuals in countries as diverse as Jordan, Denmark and Turkey. His findings are the latest in a decade of genetic research, which began in 1996, when Professor Eiberg first implicated the OCA2 gene as being responsible for eye colour.
Nature shuffles our genes

The mutation of brown eyes to blue represents neither a positive nor a negative mutation. It is one of several mutations such as hair colour, baldness, freckles and beauty spots, which neither increases nor reduces a human’s chance of survival. As Professor Eiberg says, “it simply shows that nature is constantly shuffling the human genome, creating a genetic cocktail of human chromosomes and trying out different changes as it does so.”



459 COMMENTS

  1. Where do you suppose the very wordswe use come from. Did you create them? Not really. Did you by chance create the smell of coffee? I wonder if you have ever noticed after looking around you and examining any and all animals on land or in water that we are very different. Sure, ants are slaves to their queen and workers but they do not build sky scrapers nor do Beavers send rockets to the moon. Maybe, just maybe, like man took the all too feisty Fox, the Mastiff, and the Bull Dog and bread them together to “Create” the in many ways superior dog we know as the Pit Bull so were we created. We all love a well built car. We all love a well bread dog or a good piece of music. All things created, and in theory there is nothing wrong with that. In theory, you and I did not create the Pit Bull, the engine or the car or the music we can’t imagine life without. Just because I did not and would not know how or even understand how does not mean the existence of these things did not have a beginning or have a creator or inventor. To a child everything is magical until they figure out Daddy did it. To people everything is Divine until we figure out how the creator did it. Maybe we did not invent the Diamond, but we figured out how to create them. In the image of our Creator or Creators we were created and in that likeness we create so so many things and recognize no other living thing does this. I’ve never met Jesus but something tells me that around 2017 years ago….. something happened and our calendar… it started again for some reason at year 01 and that is a trip. I can no more explain my hand or why my print is unique to anyone else or why people have to die so I won’t pretend science didn’t take a rib from a man to create a woman or breed a blend of vertebrates and a little of this or that to create ideally man. Personally, I ask myself the same question since I was 13. “What is IS?” I think the creation of man question is the easy or easier one in which to find answers. But, how did everything become, what is is and how did is become. These answers may even be pondered by Our Creator. People say that we will know everything after we die. This must be inside information straight from the source because that is a huge statement. Because I tend to think with common sense, death has to be no less beautiful than life or life would not make sense at all. I believe there is one answer, one high ideal, one fantastic characteristic of man that allows us to continue on and that is love. Love beyond a doubt is the most treasured value of man, and the vehicle for our soul. Without Love, the ego dies and all that is left is the mind and its not enough. The Soul without Love is without Identity or Purpose. To have only a mind is like having a face without expression or a piece of written music on paper never hearing it played. As for the RH factor I do not have it. I am O positive yet I possess almost all of the traits listed including lower blood pressure and body temperature, psychic ability and dreams, healing, electrical disturbances and yes the old fifties plastic record player played all by itself our favorite song. I happen to think black people are black because they spent so much time in freaking Africa and white people spent so much time in the cold away from the sun and the Indians are from a warm region and the south american, the tropics…. common sense. Nothing can alter the truth. Our Purpose is Love people. Do it for the love! It’s why we are here, how to get there and yes, it’s the meaning of life. Love, the beauty of simplicity. When the questions are so complicated, the answers are so simple. Let love be the judge of all things because it makes the most sense. Our minds are not enough no matter how hard we think it.

  2. 21 year-old Mixed Plant Farmer Rodger from Sainte-Genevieve,
    enjoys to spend time running, Situs Bola and cigar smoking.
    Gets encouragement by touring Historic City of Ayutthaya.

  3. How was the time frame of 6 to 10, 000 years ago determined? Who was this ancestor? No mention of theories regarding genetic mutation travel around the world or associated csuses and time frames. Why is there no reference to the possibility of earlier mutations having occurred but the people were killed by superstition? This article is severely lacking in detail.

  4. @John,
    If you feel the need to assert your “facts”, kindly consider that spouting off in such a manner, with such horrific grammar and spelling, only serves to highlight your ignorance. People will chuckle, regard you as a dumb ass, and move on.

    Oh, and also:

    Piece is a fragment or a part of a whole object whether tangible or intangible, such as a piece of a puzzle, a piece of evidence (which, I might add, your tirade is completely free from), or a piece of imagination, which you clearly don’t have.
    Peace is a tranquil, calm feeling or or scene, and it is this use of peace that would have been the correct end to your tirade.

  5. Dum asses, tricks are for kids. God does not exist ,never did never will,fantasy, hear say, no proof,
    Same proof said Santa is real, books,
    Legends etc. Grow up ,smell the coffee, care about people first as people. Stop hating each other,we are all animals on a lone planet we all live on together. It’s the only planet we can live on , so stop destroying it. Once it’s gone we all are gone. But not to heaven or hell.just gone. Peice out.

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