Asians, Too, Mated With Archaic Humans, DNA Hints
http://news.nationalgeographic.com/news/2011/11/111101-humans-mating-denisovans-neanderthals-southeast-asia-science/
(To tell the truth, I could not understand what the article mainly mentioned.)
A research represented that one percent of Asians might be the descendant of the archaic humans who mated with Denisovans, cousins of Neanderthals genetically. The newest research mentions that the offspring are still alive in mainland Asia, nevertheless, the DNA of Denisovans have never been discovered from Asia so far. The research is based on DNA extracted from 40,000-year-old Denisovans finger bone which was discovered in Siberian Russia's Altai Mountain in 2008. The research says that the DNA of people who are in Papua New Guinea and other Melanesian islands share 4 to 6 % of their ancestry with the archaic humans. Researchers use a specific way to investigate the DNA. The way is called single nucleotide polymorphisms(SNPs) which measures genetic variation in DNA blocks. The data has a mass individual gene information so that researchers compares the Neanderthal and Denisovan genomes by using the data from more than 1,500 people in the world. This method usually results errors but they try to the other method to reduce such errors. The result represents that Denisovans gene remains fewer Asians than Melanesian, but the researchers believe they are different admixture way from Melanesian. In other words, they believe that Asians still have the possibility of the descendant of Denisovans.
Some scientists accuse their research, and represent the different evidence to prove their ideas. According to their research, only 5% archaic humans scattered all over the world from Africa, so it is difficult to prove that only 1% Asians are the descendant of Denisovans. Indeed, the admixture between one archaic human beings and the other archaic one is the possible incident, but 95% of people is the modern human that left Africa 50,000 years ago.
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