Evolutionary history of modern Samoans
Open Access
- 14 April 2020
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 117 (17), 9458-9465
- https://doi.org/10.1073/pnas.1913157117
Abstract
Archaeological studies estimate the initial settlement of Samoa at 2,750 to 2,880 y ago and identify only limited settlement and human modification to the landscape until about 1,000 to 1,500 y ago. At this point, a complex history of migration is thought to have begun with the arrival of people sharing ancestry with Near Oceanic groups (i.e., Austronesian-speaking and Papuan-speaking groups), and was then followed by the arrival of non-Oceanic groups during European colonialism. However, the specifics of this peopling are not entirely clear from the archaeological and anthropological records, and is therefore a focus of continued debate. To shed additional light on the Samoan population history that this peopling reflects, we employ a population genetic approach to analyze 1,197 Samoan high-coverage whole genomes. We identify population splits between the major Samoan islands and detect asymmetrical gene flow to the capital city. We also find an extreme bottleneck until about 1,000 y ago, which is followed by distinct expansions across the islands and subsequent bottlenecks consistent with European colonization. These results provide for an increased understanding of Samoan population history and the dynamics that inform it, and also demonstrate how rapid demographic processes can shape modern genomes.Funding Information
- Royal Society of New Zealand (UOA1709)
- HHS | NIH | National Cancer Institute (T32CA154274)
- HHS | NIH | National Human Genome Research Institute (R35-HG010692-01)
- HHS | NIH | National Heart, Lung, and Blood Institute (U01 HL137181-01)
- NIH (R01-HL133040)
- NIH (R01-HL093093)
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