Jean sent me a copy of this study (many weeks ago, admittedly), which is an update on the maybe more interesting previous paper by the same UPV-EHU team of June 2015, discussed in this entry.
Patricia Villaescusa et al., Dissection of the DF27 paternal lineage. FSI Genetics 2015. Freely accessible → LINK [doi: http://dx.doi.org/10.1016/j.fsigss.2015.09.172]
The genetic evidence provided by the analysis of the Y chromosome is a valuable tool for the study of the evolution of paternal lineages. The dissection of S116, the major M269 subhaplogroup in Western and South-Western Europe uncovered an outstanding frequency of DF27 sublineage in the Basque region. In this study, a dissection of DF27 haplogroup was performed to the highest resolution to date in 340 individuals from the Basque Country. Our results describe frequency distribution patterns for some DF27 sublineages for the first time, and reveal a possible substructure of its paragroups.
And that's basically what it is. They found that Basque R1b-DF27 (70%) mostly belong to two categories: DF27* (31%) and S356 (28%), which are neatly distinct in the neighbor-joining haplotype structure, suggesting to the authors that the remaining DF27* may constitute a yet undescribed subhaplogroup.
|Fig. 1. MJN of the DF27 haplogroup in the autochthonous Basque population sample. Two phylogenetic splits into DF27* and S356* paragroups can be observed.|
Table 1 lists the frequencies in their Basque sample for a variety of markers under DF27, which includes 70% of Basque Y-DNA lineages. However there's also a significant fraction of R1b-S116* which they only mention by passing:
The high frequencies of DF27* and S116* paragroups indicate a probable existence of new subhaplogroups supporting the subdivision of both of them.
To understand this we have to go back to Valverde 2015, which detected high frequencies of paragroup R1b-S116* among Basques and Irish (but not other Iberians nor Bretons). There is a blank of knowledge about the exact details of R1b-S116 in France but otherwise we have a pretty good idea of the phylogenetic and geographic structure (what I call the "geostructure") of this most important European patrilineage.
I won't repeat everything (please check the provided link and other links stemming from there for full details) but I will again synthesize what it means here because there is still some people who seems oblivious to factual reality about this haplogroup. An image is worth a thousand words:
|My reconstruction of the origins of R1b-S116 based on known 'geostructure'|
The three ovals represent very generically the distribution of the three major subclades of R1b-S116 (check the Valverde 2015 maps for full details), the two green stars represent confirmed areas of high R1b-S116* frequencies and the pale green star with the question mark represent possible other such areas in France, particularly an unconfirmed (unsourced) claim on this paragroup being very important at the Massif Central. If you know something more on this fine detail of R1b-S116 in France (or other relevant areas such as Britain, Germany), please share (with references).
It has been recently known that some Bell Beaker period Irish already carried R1b-M529, what forces the origins of the overall S116 haplogroup to an older date necessarily, at the very least Early Chalcolithic, more likely Neolithic. I'll discuss those findings in an upcoming entry.
Personally I'm tempted for a Dordogne or Greater Aquitaine area of origin, i.e. rather to the West than to the East of the pink delimited region, but cannot be sure with the data we have as of now, particularly the many blanks in France's coverage.
The claims about this major European lineage being original from Central Europe or even Eastern Europe are totally inconsistent with the data we have: they are nothing but wishful Indoeuropeanist thinking and totally within the realm of pseudoscience.