Apparent variation in Neanderthal admixture among African populations is consistent with gene flow from non-African populations
Genre
Journal ArticleDate
2013-12-01Author
Wang, SLachance, J
Tishkoff, SA
Hey, J
Xing, J
Subject
Neanderthal admixturehuman evolution
whole-genome sequencing
Africa South of the Sahara
African Continental Ancestry Group
Animals
Evolution, Molecular
Gene Flow
Humans
Neanderthals
Polymorphism, Single Nucleotide
Permanent link to this record
http://hdl.handle.net/20.500.12613/5360
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Show full item recordDOI
10.1093/gbe/evt160Abstract
Recent studies have found evidence of introgression from Neanderthals into modern humans outside of sub-Saharan Africa. Given the geographic range of Neanderthals, the findings have been interpreted as evidence of gene exchange between Neanderthals and modern humans descended from the Out-of-Africa (OOA) migration. Here, we examine an alternative interpretation in which the introgression occurred earlier within Africa, between ancestors or relatives of Neanderthals and a subset of African modern humans who were the ancestors of those involved in the OOA migration. Under the alternative model, if the population structure among present-day Africans predates the OOA migration, we might find some African populations show a signal of Neanderthal introgression whereas others do not. To test this alternative model, we compiled a whole-genome data set including 38 sub-Saharan Africans from eight populations and 25 non-African individuals from five populations. We assessed differences in the amount of Neanderthallike single-nucleotide polymorphism alleles among these populations and observed up to 1.5% difference in the number of Neanderthal-like alleles among African populations. Further analyses suggest that these differences are likely due to recent non-African admixture in these populations. After accounting for recent non-African admixture, our results do not support the alternative model of older (e.g., >100 kya) admixture between modern humans and Neanderthal-like hominids within Africa. © The Author(s) 2013. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.Citation to related work
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http://dx.doi.org/10.34944/dspace/5342