Originally posted by 1798
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The usual understanding of "Middle East" certainly is a possibility for where R1b originated. However, I think we should also consider nearby locations, slightly to the east and north. Think of the Caucasus or present day Iran or neighboring Afghanistan/Pakistan. Basically, the area from Turkey to western Afghanistan/Pakistan.
I do think that it's a good possibility that R1b entered Europe from Anatolia and the Caucasus in the Neolithic, but also that a later wave entered Europe from the steppes north of the Black Sea. I think the second wave may be the ancestors of the Bronze Age R1b that came to dominate Europe.
In any event, most of the DNA studies of ancient remains, at least in the Neolithic period, have been done in Europe, not the Middle East. So, I don't know how many results we have from Middle Eastern remains, but they're relatively few compared to European remains.
There are a couple of interesting studies just published which Dienekes has blogged about that shed some new light on the geography and chronology of Eurasian haplogroups.
The first one is a study - see http://dienekes.blogspot.com/2014/06...up-k-m526.html - that has some breakthrough SNP discoveries related to haplogroup K, which is the gg-granddad, so to speak, of R and Q, via P. It shows that with the discovery of these new SNPs, the K haplotree is firmly rooted in southeast Asia and that P and its sons R and Q are more closely tied to that geographic origin than thought before. The abstract says, "Interestingly, the monophyletic group formed by haplogroups R and Q, which make up the majority of paternal lineages in Europe, Central Asia and the Americas, represents the only subclade with K2b that is not geographically restricted to Southeast Asia and Oceania. [my bolding] Estimates of the interval times for the branching events between M9 [SNP defining K] and P295 [defines P] point to an initial rapid diversification process of K-M526 [defines K2, P is actually K2b2] that likely occurred in Southeast Asia, with subsequent westward expansions of the ancestors of haplogroups R and Q [my bolding]." (This is something that Dr. Hammer referred to in his November presentation on R-M269.) So, this study is firmly placing P, father of R, very far to the east, which gives its descendant haplogroups a very long (geographically and timewise) trip to reach Europe.
The second study - see http://dienekes.blogspot.com/2014/06...age-altai.html - deals with the results of DNA testing of remains from Bronze Age Altai, again far to the east of Europe. For both yDNA and mtDNA, the haplogroups found (although none are R1b) are a mix of east and west Eurasian. This shows, as late as the Bronze Age, some genetic flow from between Europe and east Asia. That may indicate that at that time R1b may have still been found at a good percentage between Europe and east Asia - in Central Asia.
So, the first study is telling us that R and its subclades certainly had a long way to go to reach Europe. And the second study hints, at least by my inference, that perhaps R1b in the Bronze Age might be found somewhere between Europe and east Asia, perhaps in the area of the steppes.
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