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| In the most comprehensive survey of genetic diversity in Native Americans so far, the team took data from 52 Native American and 17 Siberian groups, studying more than 300,000 specific DNA sequence variations called Single Nucleotide Polymorphisms to examine patterns of genetic similarities and differences between the population groups. (Picture from: http://www.terradaily.com/) |
The origins of Native Americans revealed. An international research team discovered the Native Americans made up of three groups of migrants coming from Asia. They arrived in America in three waves of migration, crossing the land bridge 15 thousand years ago.
The findings, published in the journal Nature shows all the group originally came from Siberia, then across Beringia, a land bridge connecting Asia and the American continent during the ice age. This land bridge now gone, and transformed into the Bering Strait.
The first migrant group known as the "First Americans" to inhabit most areas of North and South America, followed by two subsequent groups inhabiting the same area. DNA from the second and third groups can still be found in Native Americans today.
By studying DNA sequence variation in Native Americans, the team found most of them are from the first group of migrants. While the two subsequent migration plays an important increase of genetic variation.
"Native Americans do not originate from a single migration," said Professor Andres Ruiz-Linares, lead researcher from University College London, Tuesday (July 17, 2012). "This study reveals the pattern of spread of human as well as in America."
The analysis revealed two populations of genetic material inherited from the first group of migrants, aka "First Americans". This reflects that the second and third groups of migrants mingled with the first group that they encounter after they arrived in North America. "At least, there are three deep lineages in Native American populations," said professor David Reich, another researcher who is also a geneticist at Harvard Medical School.
The team also found an indigenous population menyebandan split from north to south along the coastal route. *** [DAILYMAIL | MAHARDIKA SATRIA HADI | KORAN TEMPO 3944]
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