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Neandertal Admixture discovered in some Indigenous Africans
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[QUOTE]Originally posted by NonProphet: [QB] [IMG]http://3.bp.blogspot.com/_Ish7688voT0/TT_-Fauo_cI/AAAAAAAADLc/WQDxCdKs8Uk/s800/african_xlinked_neandertal.png[/IMG] An X-linked haplotype of Neandertal origin is present among all non-African populations Vania Yotova et al. Abstract Recent work on the Neandertal genome has raised the possibility of admixture between Neandertals and the expanding population of H. sapiens who left Africa between 80 Kya and 50 Kya to colonize the rest of the world. Here we provide evidence of a notable presence (9% overall) of a Neandertal-derived X chromosome segment among all contemporary human populations outside Africa. Our analysis of 6092 X-chromosomes from all inhabited continents supports earlier contentions that a mosaic of lineages of different time depths and different geographic provenance could have contributed to the genetic constitution of modern humans. It indicates a very early admixture between expanding African migrants and Neandertals prior to or very early on the route of the out-of-Africa expansion that led to the successful colonization of the planet. [i]Out of 1420 sub-Saharan chromosomes, only one copy of B006 was observed in Ethiopia, and five in Burkina Faso, one among the Rimaibe and four among the Fulani and Tuareg, nomad-pastoralists known for having contacts with northern populations (Table S1). B006 only occurrence at the northern and north-eastern outskirts of sub-Saharan Africa is thus likely to be a result of gene flow from a non-African source.[/i] [i]Interestingly, some of the HapMap3 haplotypes from the segments proposed by Green et al. (Green et al. 2010), and fulfilling our criteria of Neandertal admixture, also turn out in Maasai, where, however, their occurrence can be due to recent back-to-Africa migration (Sikora et al. 2010).[/i] More evidence in favor of Multi-Regional or Assimilation evolution. [IMG]http://1.bp.blogspot.com/_JeQ3iRauaM0/TRKE2zdxkII/AAAAAAAAAI0/JDDjS-_eIfU/s400/THE%2BTREE.gif[/IMG] [IMG]http://blogs.discovermagazine.com/gnxp/files/2010/12/fourmodels1.png[/IMG] [IMG]http://3.bp.blogspot.com/_Ish7688voT0/TRjGWd8Pm6I/AAAAAAAADHE/FVVZDNA5nHA/s800/phylogeny.png[/IMG] [IMG]http://www.rdos.net/neanderthal.jpg[/IMG] [IMG]http://img.dailymail.co.uk/i/pix/2007/10_04/019Neanderthal_228x298.jpg[/IMG] http://mbe.oxfordjournals.org/content/early/2011/01/25/molbev.msr024.short [/QB][/QUOTE]
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