"Population Y": an Australasian-related ancestry in the Amazon, not in North America (Brazil; Nature, 21 July 2015)

SUMMARY"Population Y": an Australasian-related ancestry in the Amazon, not in North America (Brazil; Nature, 21 July 2015) [Connections: Genetics (honest), Nov 5, 2026]

RECORDSkoglund, Reich and colleagues, Nature (doi 10.1038/nature14895): "some Amazonian Native Americans descend partly from a Native American founding population" with ancestry "more closely related to indigenous Australians, New Guineans and Andaman Islanders"; "This signature is not present to the same extent, or at all, in present-day Northern and Central Americans." Named Population Y after the Tupí word "Ypykuéra" (ancestor); groups: Suruí, Karitiana (Tupí) and Xavante (Gê). Reich: "About 2% of the ancestry of Amazonians today comes from this Australasian lineage," which "doesn't establish how much of their ancestry comes from Population Y" (possibly much more). Skoglund: "It's an unknown group that doesn't exist anymore." A rival Science paper the same day (Raghavan et al.) is cited by Nature News

PATTERNthe genetics of the Americas already holds an unexplained founding stream; the "single migration" story was revised by its own scientists

LENS (WW9)Their own lab says the first peopling story had a ghost in it (Rule 13)

OPENthe signal is Australasian-related, not African; it was not found in North America in the samples tested, which include no Southeastern people. Raghavan's competing interpretation was not read on a fetched page

SOURCENature abstract; Sci.News, 2015; ScienceDaily, 21 July 2015; Nature News.