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Post by djoser-xyyman on Jun 23, 2019 19:31:21 GMT -5
Ancient DNA reveals a multistep spread of the first herders into sub-Saharan Africa- Mary E. Prendergast 2019 quote: "To address these debates, we generated genome-wide ancient DNA data from individuals buried at sites associated with LSA (n = 3), early pastoral and PN (n = 31), IA (n = 1), and PIA (n = 6) archaeological traditions in what are now Kenya and Tanzania (Fig. 1, Table 1, and table S1)." Again in this instance SSA is Kenya and Tanzania!!! Odd that only one Iron Age sample was teted and it turns out to be the dreaded Bantu lineage. They claim Eurasian Backmigration but only ONE carry Eurasian mtDNA hg-HV which is at the root of the mtDNA tree. I think they are claiming yDNA E1b1b is of Eurasian origin? I need more time to process this paper.  |
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Post by zarahan on Jun 26, 2019 20:04:19 GMT -5
What are some of the dates of this sampling?
PEr ne scimag news article:
The new genetic results reveal that this spread of herding into Kenya and Tanzania involved groups with ancestry derived from northeast Africa, who appeared in East Africa and mixed with local foragers there between about 4500-3500 years ago. Previously, the origins and timing of these population shifts were unclear, and some archaeologists hypothesized that domestic animals spread through exchange networks, rather than by movement of people.
After around 3500 years ago, herders and foragers became genetically isolated in East Africa, even though they continued to live side by side. Archaeologists have hypothesized substantial interaction among foraging and herding groups, but the new results reveal that there were strong and persistent social barriers that lasted long after the initial encounters.
Another major genetic shift occurred during the Iron Age around 1200 years ago, with movement into the region of additional peoples from both northeastern and western Africa. These groups contributed to ancient ancestry profiles similar to those of many East Africans today. This genetic shift parallels two major cultural changes: farming and iron-working.
If they are talking 3000 or even 4000 years ago then that's 1000-2000 BC, not recent, but not
really old, comparatively speaking. 2000 BC would be significantly after people like the Badarians
in the Nile Valley and those before them at 5000-3500BC, or the cattle herders of the Khartoum Neolithic.
In any event, as the article notes, the people derive from East/NE Africa. If they migrated out
then came back they are still Africans. A different gene variant would not make much difference
as phenotypically, the "returnees" still look like other regional tropical Africans. There is also
the matter of root types of gene, or "proto" genes developing in Africa first before any migration out.
The root types may by more elaborate upon return but origin would still be in Africa. Calling them
"Eurasian" would not change this basic reality, or the reality of the tropical African phenotype.
But in any event will wait for more info and excerpts.
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