🇰🇲 Earliest Austronesian–African mixing in the Swahili world

Genomes from coastal Kenya, the Comoros, and regional references show a Bantu-based continuum along the Swahili Corridor. What’s different in the Comoros is a clear Austronesian signal: Comorian groups carry about 8–9% Island Southeast Asian ancestry and ~6–7% Middle Eastern ancestry, whereas Kenyan Swahili in this dataset are essentially African.

Dating points to the Comoros as the first gateway, with Austronesian–African admixture starting in the 8th century, predating Madagascar’s major pulse in the 11th–12th centuries. Sex-biased patterns in the Comoros fit the history: female-biased African and Asian inputs alongside a male-biased Middle Eastern trickle.

Takeaway: The Comoros mark the earliest Austronesian gene flow into the Swahili Corridor, adding a small but telling Asian layer onto a predominantly Bantu genetic base.

Source: Brucato et al., 2018. The Comoros Show the Earliest Austronesian Gene Flow into the Swahili Corridor.