Moreno-Mayar, J. Víctor4; Rasmussen, Simon5; Seguin-Orlando, Andaine4; Rasmussen, Morten4; Liang, Mason8; Flåm, Siri Tennebø7; Lie, Benedicte Alexandra7; Gilfillan, Gregor Duncan7; Nielsen, Rasmus4; Thorsby, Erik7; Willerslev, Eske4; Malaspinas, Anna-Sapfo4
1 Department of Systems Biology, Technical University of Denmark2 Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark3 Metagenomics, Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark4 University of Copenhagen5 Department of Bio and Health Informatics, Technical University of Denmark6 University of California at Berkeley7 University of Oslo8 University of California at Berkeley
Background: Rapa Nui (Easter Island), located in the easternmost corner of the Polynesian Triangle, is one of the most isolated locations on the planet inhabited by humans. Archaeological and genetic evidence suggests that the island was first colonized by Polynesians around AD 1200, during their eastward expansion. Although it remains contentious whether Polynesians reached South America, suggestive evidence has been brought forward supporting the possibility of Native American contact prior to the European “discovery” of the island in AD 1722. Results: We generated genome-wide data for 27 Rapanui. We found a mostly Polynesian ancestry among Rapanui and detected genome-wide patterns consistent with Native American and European admixture. By considering the distribution of local ancestry tracts of eight unrelated Rapanui, we found statistical support for Native American admixture dating to AD 1280–1495 and European admixture dating to AD 1850–1895. Conclusions: These genetic results can be explained by one or more pre-European trans-Pacific contacts.
Current Biology, 2014, Vol 24, Issue 21, p. 2518-2525