Siberians Share DNA With Extinct Human Species
November 1, 2011 by staff
Siberians Share DNA With Extinct Human Species, Researchers have found that people in the genetic material of East Asia’s share with Denisovans, which was called the cave of Siberia where he met for the first time.
The new study covers a larger part of the previous research world, and is clearly not as simple as previously thought.
Professor Mattias Jakobsson, University of Uppsala in Sweden who led the study with graduate students Ponto Skoglund said the hybridization was carried out at various points in the evolution and genetic traces of this can be found in several places the world.
He said: “It’s probably the discovery more events like these.
“Previous studies have found two separate events hybridization between the so-called primitive hominids – different from modern humans, both genetics and morphology – and the ancestors of modern humans after their appearance in Africa.
“There was no hybridization between Neanderthals and the ancestors of modern humans out of Africa and the hybridization between Denisovans and the ancestors of the indigenous people of Oceania.
“The genetic difference between Neanderthals and Denisovans is about as large as the maximum variation of modern humans among us.”
Study Uppsala scientists “demonstrates that hybridization also occurred in the mainland of East Asia.
The connection was discovered by the use of genotype data in order to obtain a broader set of data.
Complete genomes of modern humans are only available from a few dozen individuals today, while genotype data has thousands of people.
These genetic data can be compared with the genome sequences of Neanderthals and Denisova that have been determined from archaeological material.
Just a little finger and a tooth have been described from the second.
Genotype data derived from genetic research, where hundreds of thousands of genetic variants of the test panels are contained in a chip.
However, this process leads to unusual variants not included, which can lead to bias if the material is treated as consisting of whole genomes.
Skoglund Professor Jakobsson and advanced computer simulations used to determine what this source of error through comparisons with archaic genes and thus have been able to use genetic data from more than 1,500 modern humans from around the world.
Professor Jakobsson said: “We found that people across Southeast Asia have a higher proportion of Denisova genetic variants associated with people from around the world, including Europe, America, Asia West and Central Africa.
“The results show that gene flow from archaic human groups also occurred in Asia.”
Skoglund said: “While we can see that the genetic material of archaic humans living in the greater extent than previously thought, we still know very little about the history of these groups and their contact with modern humans occurred.”
Why are genetic variants related Denisova in Southeast Asia and Oceania, but not in Europe and America, the researchers suggest that hybridization with the man of Denisova was held about 20 million years, but could also have occurred before.
This is long after the branch that became modern humans diverged from the branch that led to Neanderthals and Denisovans about 300,000 to 500,000 years ago.
Professor Jakobsson said: “With more complete genomes of modern humans andanlysis of fossil material, it will be possible to describe the prehistory with much greater accuracy and detail.”
The findings were published in the online edition of the journal PNAS.
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