Razib Khan One-stop-shopping for all of my content

October 5, 2012

The rise of the farming lineages

Filed under: Genetics,R1b,R1b1b2 — Razib Khan @ 8:02 am

There’s an open access paper/preprint on Y chromosomal lineages that just came out, A calibrated human Y-chromosomal phylogeny based on resequencing. Since it is open access you can read the whole thing (it’s short). Let me quote from the discussion:

Nevertheless, the rapid expansion of R1b (and possibly I1) in Europe contrasts with the less starlike expansion of E1b1a in Africa, which has been associated with the spread of farming, ironworking and Bantu languages in Africa over the last 5,000 years (Berniell-Lee et al. 2009). Both R1b and E1b1a samples are from a mixture of indigenous donors (from Europe and Africa, respectively) and admixed American donors, so sampling strategy does not provide an obvious explanation for the difference. Instead, the different phylogenetic structure, with far more resolution of the individual E1a1a branches, may reflect expansion starting from a larger and more diverse population, and thus retaining more ancestral diversity.

R1b is the most common haplogroup in Western Europe. This group places its growth 4-13,000 years ago. That suggests to them a Neolithic expansion. I am moderately confident in this number because ancient DNA extraction has not found much R1b in Europe 5-10,0000 years before the present, even though this lineage ...

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