2026-09-06T21:04:21Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/114342026-02-26T01:05:52Zcom_10259.4_2532com_10259.4_2477com_10259.4_106com_10259_2604col_10259.4_2533

Arauna, Lara R. Bergstedt, Jacob Choin, Jeremy Mendoza-Revilla, Javier Harmant, Christine Roux, Maguelonne Mas Sandoval, Alex Lémée, Laure Colleran, Heidi François, Alexandre Valentin, Frédérique Cassar, Olivier Gessain, Antoine Quintana-Murci, Lluis Patin, Etienne 2026-02-25T17:35:59Z 2026-02-25T17:35:59Z 2022-11 0960-9822 https://hdl.handle.net/10259/11434 10.1016/j.cub.2022.08.055 The Vanuatu archipelago served as a gateway to Remote Oceania during one of the most extensive human migrations to uninhabited lands ∼3,000 years ago. Ancient DNA studies suggest an initial settlement by East Asian-related peoples that was quickly followed by the arrival of Papuan-related populations, leading to a major population turnover. Yet there is uncertainty over the population processes and the sociocultural factors that have shaped the genomic diversity of ni-Vanuatu, who present nowadays among the world’s highest linguistic and cultural diversity. Here, we report new genome-wide data for 1,433 contemporary ni-Vanuatu from 29 different islands, including 287 couples. We find that ni-Vanuatu derive their East Asian- and Papuan-related ancestry from the same source populations and descend from relatively synchronous, sex-biased admixture events that occurred ∼1,700–2,300 years ago, indicating a peopling history common to the whole archipelago. However, East Asian-related ancestry proportions differ markedly across islands, suggesting that the Papuan-related population turnover was geographically uneven. Furthermore, we detect Polynesian ancestry arriving ∼600–1,000 years ago to Central and South Vanuatu in both Polynesian-speaking and non-Polynesian-speaking populations. Last, we provide evidence for a tendency of spouses to carry similar genetic ancestry, when accounting for relatedness avoidance. The signal is not driven by strong genetic effects of specific loci or trait-associated variants, suggesting that it results instead from social assortative mating. Altogether, our findings provide an insight into both the genetic history of ni-Vanuatu populations and how sociocultural processes have shaped the diversity of their genomes. L.R.A. was funded by a Pasteur-Roux-Cantarini fellowship from the Institut Pasteur. The laboratory of Human Evolutionary Genetics is supported by the Institut Pasteur, the Collège de France, the CNRS, the Fondation Allianz-Institut de France, the French Government’s Investissement d’Avenir programme, Laboratoires d’Excellence “Integrative Biology of Emerging Infectious Diseases” (ANR-10-LABX-62-IBEID) and “Milieu Intérieur” (ANR-10-LABX-69-01), the Fondation de France (no. 00106080), the Fondation pour la Recherche Médicale (Equipe FRM DEQ20180339214), and the French National Research Agency (ANR-19-CE35-0005). application/pdf eng Cell Press Current Biology. 2022, V. 32, n. 21, p. 4565-4575.e6 https://doi.org/10.1016/j.cub.2022.08.055 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Pacific Remote Oceania Vanuatu Lapita Peopling Migrations Admixture Genetics Assortative mating Residence rules Genética de poblaciones Population genetics The genomic landscape of contemporary western Remote Oceanians info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Current Biology 32 21 4565 4575.e6