Unknown Human DnaUnidentified human DNA
Even though fossile proof is made up of only a single bony fraction and a single dental, the DNA obtained from the bones has produced a preliminary genomic DNA sequences that enables researchers to draw astonishing inferences about this endangered part of the human pedigree, known as Denisovans after the cavern in which the fossils are located.
Results are presented in the December 23 edition by an inter-national research group, many of whom are the same investigators who released the novel drug candidate novel at the beginning of the year. When the Denisovan genomic sequences were compared with the neanderthals' and human beings' generations, the Denisovans were a group of Neanderthals who were descendants of the same strain populations that once split from the present human family.
It also found unexpected references to Denisovan gen sequence in contemporary Melanesians, indicating that there was a cross between Denisovans and the Melanesian ancestry, just as Neanderthalers seem to have crossed with the forebears of all non-Africans today. Denisovans seem to be different from Neanderthalers and human beings both in genetics and morphology.
Teeth in the same cavity as phalanges show a different type of neanderthal and human skeleton, similar to much older human ancestry such as gay habils and erect homos. The DNA analyses showed that the teeth and phalanges came from different specimens of the same group.
In 2008 the phalanges were found by a group of Russians in Denisova Cave, an archeological site in South Siberia. Paabo, who had previously worked with Russians, received the bones for his research on old DNA. At the Leipzig site, DNA was isolated from the bones and the human chromosome DNA sequences, a smaller DNA sequences that are separated from the chromosome DNA and more easily obtained from old specimens, were used.
Results released early this year showed a sudden deviation from the neanderthal and human genomic mirochondrial patterns, and the research group quickly began sequencing the genom. He said that the relation between Denisovans and today's Melanesians was a totally unpredictable one. Compare the genomic DNA of New Guinea and Bougainville Island specimens to show that Denisovans' genomic materials account for 4 to 6 per cent of the genomic DNA of at least some Melanese population.
That Denisovans were found in South Siberia, but genetics did contribute to human modern peoples in Southeast Asia suggest that their people may have been prevalent in Asia during the later Pleistocene, said David Reich of Harvard Medical School, who conducted the populace's genetic analyses. The Neanderthal and Denisovan genome creates a new, more sophisticated image of the evolution of man and our endangered family.
Green says there was probably an ancestors' group that abandoned Africa 300,000 to 400,000 years ago and quickly separated, with one being the Neanderthals who expanded into Europe and the other heading eastward and becoming Denisovans. About 70,000 to 80,000 years ago, when man abandoned Africa, he first met the Neanderthals, an interactions that leave behind DNA from Neanderthals dispersed in the genome of all non-Africans.
A group of people later came into touch with Denisovans and left tracks of Denisovan DNA in the human genome of those who established themselves in Melanesia.