Ancient west Eurasian ancestry in southern and eastern Africa

摘要: The history of southern Africa involved interactions between indigenous hunter–gatherers and a range populations that moved into the region. Here we use genome-wide genetic data to show there are at least two admixture events in Khoisan (southern African pastoralists who speak non-Bantu languages with click consonants). One related Niger–Congo-speaking populations, other introduced ancestry most closely west Eurasian (European or Middle Eastern) populations. We date this latter event ∼900–1,800 y ago it had largest demographic impact Khoe–Kwadi languages. A similar signal is present throughout eastern Africa. In particular, also find evidence for Kenyan, Tanzanian, Ethiopian earlier which Eurasians ∼2,700–3,300 ago. reconstruct allele frequencies putative population good proxy parsimonious explanation these findings entered indirectly through