The Khoisan carry Neanderthal DNA.
http://bafsudralam.blogspot.com/2014/07/the-khoisan-and-neanderthal.html
"It was probably in Morocco that Neanderthal and Khoisan interacted. An exception to this norm are the Khoisan who share a phylogenic relationship with Altai Neanderthals (Prufer, et al, 2013)."
" Many researchers claim that Africans have no relationship to the Neanderthals.But Prufer et al (2013) observed that Khoisan share more alleles with Altaic Neanderthal than Denisova. In the Supplemental section of Prufer et al (2013) there is considerable discussion of the relationship between Neanderthal and Khoisan.
In relation to the Altaic Neanderthal the non-Africans have a lower divergence rate than Africans between 10-20%. Prufer et al (2013) note little statistical difference between non-African and African divergence.
Researchers have observered a relationship between the Neanderthals, the Khoisan and Yoruba. Prufer et al (2013) detected a relationship between the Neanderthal and Mandekan. It is interesting to note that Yoruba traditions place them in Mande-speaking areas (Prufer et al,2013).
There is interesting information in Figure S7.1. In Figure S7.1 the maximum likelihood tree of bonobo, Denisova and Neanderthal, the closest present-day hmans are Africans, not Europeans. Reading the Tree Chart Graph, the neighbor joining tree of archaic and present day human individuals has the Khoisan following the Denisova. An interesting finding of Prufer et al (2013) was that Altaic Neanderthal and Denisova are estimated to have similar split times.
The divergence estimate for African Khoisan-Mandekan and Altaic is younger than the split between Africans and Denisova archaic individuals and modern African individuals. The split times between the Khoisan and Mandekan may be explained by the presence of AF-24 haplotype in West Africa. The major problem with the paper is that the Prufer et al (2013)believe that there was a back-to-Africa migration of Eurasian genomes among West Africans people.
This back migration probably did not occur. What we do know is that the ancient Kushite people belonged to the C-Group. The C-Group people spoke Niger-Congo and Dravidian languages. The Kushites founded many civilizations in Eurasia including the Sumerian and Elamite civilizations. The Kushites may have spread L3(M) and y-chromosome R haplogroup in Eurasia. This suggest that so-called Eurasian genomes are the result of admixtures of Europeans and Kushites.
In summary the Khoisan early settled Morocco. From here they interacted with Neanderthal populations. Later the Khoisan migrated into Iberia an deposited many genomes of the L clade and L3(N) macrohaplogroup.
Reference:
de Domínguez E.F. Polimorfismos de DNA mitocondrial en poblaciones antiguas de la cuenca mediterránea. Universitat de Barcelona. Departament Biologia Animal, 2005 (PhD thesis).
Gonder MK, Mortensen HM, Reed FA, de Sousa A, Tishkoff SA. (2006). Whole mtDNA Genome Sequence Analysis of Ancient African Lineages. Mol Biol Evol. 2006 Dec 28.
Ki-Zerbo,J. (1981). Unesco General History of Africa Vol. 1: Methodology and African Prehistory (1981), pg.572.
Pruler,K, Racimo,F.,Patterson,N et al. (2014). The complete genome sequences of Neanderthal from the Altai, Mountains. Nature , 505/7481: 43-9. doi .10.1038/ Nature 12881.Epub.2013.Dec.18.
Scozzari, R, Massaia,A, Trombatta,B. et al.(2014). An unbiased resource of novel SNP markers provides a new chronology for human Y-chromosome and reveals a deep phylogenetic structure in Africa. Genome Research, January 6,2014, doi: 10.1101/gr./60785.113.
Winters C. The Gibraltar Out of Africa Exit for Anatomically Modern Humans. WebmedCentral BIOLOGY 2011;2(10):WMC002311 .
http://www.webmedcentral.com/article_view/2311
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Dr. Clyde Winters at
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