Brotherton et al. have just
released a new paper in which they publish the full mitochondrial sequences of 39 ancient remains dating from 5000 BCE to 500 BCE. 37 of them are from Neolithic and Bronze Age Germany. The two others belong respectively to the Nuragic culture of Bronze Age Sardinia (H1aw1) and the Alpine Celtic Iron Age in what is now South Tyrol, Italy (H90). The data is in itself invaluable, but the interpretation made by the authors of the study is, as usual, very subjective and in my opinion completely mistaken.
The paper says:
I do not doubt that mt-haplogroup H was brought to Europe mainly by Neolithic farmers. The problem is that they assume that the Y-DNA haplogroups that are most common in Europe today (R1b and R1a) were brought by the same people as those associated with the most common mtDNA haplogroups.
My understanding of Indo-European migrations is that adventurous R1b men from the Pontic Steppes invaded at first Southeast Europe, where they had children mostly with local women, then progressively conquered all Central and Western Europe. The consequence of staying nearly 1000 years in the Danube basin before moving westward is that their mtDNA would have become essentially the same as that of the Neolithic people of Southeast Europe. Using the same strategy of killing or ostracising men in conquered populations and taking the women as trophies, concubines or wives, the R1b people would have become perfectly hybridised on paternal and maternal lines, pretty much as what can be observed in some Latin American countries today (with mostly European Y-DNA and a lot of Native American mtDNA).
Brotherton et al. are jumping to the wrong conclusions and attributing the spread of Indo-European languages to Neolithic farmers, and placing the origins of Celtic culture in Iberia with the Bell Beakers. I have commented enough on the ludicrousness of such theories on this forum, so I won't say more.
Here is a summary of the deep subclades identified by the study.
Linear Pottery (LBK), c. 5000 BCE, Germany
H (2x), H1bz, H1e, H1j, H23, H26, H46b, H88
Rossen culture, c. 4625-4250 BCE, Germany
H1, H5b, H16, H89
Schöningen culture, c. 4100-3950 BCE, Germany
H1e7, H10i
Baalberge culture, c. 3950-3400 BCE, Germany
H1e1a5, H7d5
Salzmünde culture, c. 3400-3025 BCE, Germany
H3 (2x)
Corded Ware, c. 2700-2400 BCE, Germany
H1, H6a1a
Bell Beaker culture, c. 2500-2050 BCE, Germany
H1, H1e7, H3b, H4a1, H5a3, H13a1a2c
Unetice culture, c. 2200-1575 BCE, Germany
H2a1a3, H3, H4a1a1a5, H7h, H11a, H82a