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Title

Statistical evaluation of alternative models of human evolution

Authors
Fagundes, N. J. R.
Beaumont, M.
Neuenschwander, S.
Salzano, F. M.
Bonatto, S. L.
Published in Proceedings of the National Academy of Sciences. 2007, vol. 104, no. 45, p. 17614-17619
Abstract An appropriate model of recent human evolution is not only important to understand our own history, but it is necessary to disentangle the effects of demography and selection on genome diversity. Although most genetic data support the view that our species originated recently in Africa, it is still unclear if it completely replaced former members of the Homo genus, or if some inter- breeding occurred during its range expansion. Several scenarios of modern human evolution have been proposed on the basis of molecular and paleontological data, but their likelihood has never been statistically assessed. Using DNA data from 50 nuclear loci sequenced in African, Asian and Native American samples, we show here by extensive simulations that a simple African replace- ment model with exponential growth has a higher probability (78%) as compared with alternative multiregional evolution or assimilation scenarios. A Bayesian analysis of the data under this best supported model points to an origin of our species about 141 thousand years ago (Kya), an exit out-of-Africa about 51 Kya, and a recent colonization of the Americas about 10.5 Kya. We also find that the African replacement model explains not only the shallow ancestry of mtDNA or Y-chromosomes but also the occurrence of deep lineages at some autosomal loci, which has been formerly interpreted as a sign of interbreeding with Homo erectus.
Keywords Bayesian analysisDNA nuclear datamulti regional hypothesisout of Africa hypothesis
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Article (Published version) (625 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Supplemental data (434 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://www.pnas.org/cgi/doi/10.1073/pnas.0708280104
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FAGUNDES, N. J. R. et al. Statistical evaluation of alternative models of human evolution. In: Proceedings of the National Academy of Sciences, 2007, vol. 104, n° 45, p. 17614-17619. https://archive-ouverte.unige.ch/unige:18197

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Deposited on : 2012-01-27

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