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Article Dans Une Revue American Journal of Human Genetics Année : 2018

The Comoros Show the Earliest Austronesian Gene Flow into the Swahili Corridor

Nicolas Brucato
  • Fonction : Auteur
Murray Cox
  • Fonction : Auteur
Joseph Wainaina Ng'Ang'A
  • Fonction : Auteur
Mohammed Omar
  • Fonction : Auteur
Bertrand Fin
  • Fonction : Auteur
Anne Boland
Jean-François Deleuze
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Mark Stoneking
Alexander Adelaar
  • Fonction : Auteur
Alison Crowther
  • Fonction : Auteur
Nicole Boivin
François-Xavier Ricaut
Joseph Wainaina Ng’ang’a
  • Fonction : Auteur

Résumé

At the dawn of the second millennium, the expansion of the Indian Ocean trading network aligned with the emergence of an outward-oriented community along the East African coast to create a cosmopolitan cultural and trading zone known as the Swahili Corridor. On the basis of analyses of new genome-wide genotyping data and uniparental data in 276 individuals from coastal Kenya and the Comoros islands, along with large-scale genetic datasets from the Indian Ocean rim, we reconstruct historical population dynamics to show that the Swahili Corridor is largely an eastern Bantu genetic continuum. Limited gene flows from the Middle East can be seen in Swahili and Comorian populations at dates corresponding to historically documented contacts. However, the main admixture event in southern insular populations, particularly Comorian and Malagasy groups, occurred with individuals from Island Southeast Asia as early as the 8th century, reflecting an earlier dispersal from this region. Remarkably, our results support recent archaeological and linguistic evidence-based suggestions that the Comoros archipelago was the earliest location of contact between Austronesian and African populations in the Swahili Corridor.

Dates et versions

hal-02112694 , version 1 (26-04-2019)

Identifiants

Citer

Nicolas Brucato, Verónica Fernandes, Stéphane Mazières, Pradiptajati Kusuma, Murray Cox, et al.. The Comoros Show the Earliest Austronesian Gene Flow into the Swahili Corridor. American Journal of Human Genetics, 2018, 102 (1), pp.58-68. ⟨10.1016/j.ajhg.2017.11.011⟩. ⟨hal-02112694⟩
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