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Data from a 40,000-year-old man in China reveals complicated genetic history of Asia
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[QUOTE]Originally posted by capra: [QB] This is [i]not[/i] about the general East Asian ancestry of Native Americans. The majority of all Amerindians' ancestry is North East Asian, related to Chinese, Mongols, Samoyeds, Tungus, etc. It's also [i]not[/i] about more recent gene flow from Arctic bringing additional East Asian ancestry - which is probably what you are thinking of with northern Natives, Thereal. This is about something else entirely. So certain indigenous people of the Amazon turn out to be slightly more closely related to Papuans, Melanesians, Australian Aborigines, etc, and Onge (from the Andamanese islands) than other Amerindians are. Amerindians are thought to pretty much all descend from the same relatively small founding population and hence any one Amerindian group normally will have almost exactly the same degree of relationship to any population outside of the Americas as any other Amerindian group (barring obviously Post-Columbian ancestry, and also that Arctic gene flow mentioned earlier). So Amazonians have a few percent of some kind of ancestry that is closer to these indigenous Indo-Pacific populations than to North East Asians (we can call this 'Paleo-Asian'). The mystery population that contributed it is called 'Population Y'. We don't know how the heck they ended up in the middle of the Amazon specifically. Tianyuan Man, 40 000 years old, comes from a cave in the Beijing area. A small part of his genome were actually sequenced several years ago, but now his whole genome has been done. He isn't directly ancestral to modern East Asians to any significant degree, but he does turn out to be a kind of Paleo-Asian; the Amazonians are related to him as well. Also GoyetQ116-1, who is from Belgium and 35 000 years old, has some of this Tianyuan-related ancestry too (mostly he is like other Ice Age Europeans). So it seems this kind of Paleo-Asian got around back in the day. (I suspect that we will find small amounts of it are all over the place, but I could be wrong, and that isn't in the actual study.) Anyway, finding the potential source of ancestry found in Amerindians in northern China should not come as a surprise to anyone, because they come from Northeast Asia! But the Population Y mystery remains. [/QB][/QUOTE]
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