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Monday, June 3, 2013

E1b1b in spain was spreaded by Romans from Italy

I have not read the paper, so I can't comment in detail. Two quick comments:
  • The discovery of G2a is added to the finds from Treilles, Derenburg, and the Alps. It is now virtually certain that the Neolithic transition in much of Europe, both inland, and coastal involved G2a-bearing men.
  • The discovery of E-V13 in Spain is unexpected on a number of different reasons: there is relatively little of it there now; it had previously been associated with the inland route of the spread of agriculture, as well as the spread of the Greeks to Sicily and Provence, or Roman soldiers at a much later date.
While this Neolithic E-V13 may well have come from the Balkans, and the common ancestor of the very uniform present-day Balkan cluster may have lived after this Spanish find, it is now certain that E-V13 was established in Europe long before the Bronze Age. This highlights the need to avoid Y-STR based calculations on modern populations for inferring patterns of ancient history, and not to conflate TMRCAs with "dates of arrival": "In short: a particular TMRCA is consistent with either the arrival of the lineage long before and long after the TMRCA in a particular geographical area."

At least for now, three of the major players of the European genetic landscape (E-V13, G2a, and I2a) have made their Neolithic appearance. Hopefully, as more ancient DNA is published, and even from later dates, more of them will turn up.

I will comment more when I get to read the paper.


From the paper:
For the six male samples, two complete and four partial Y-STRs haplotypes were obtained (Table 3). They allowed classification of individuals into two different haplogroups: G2a (individuals ave01, ave02, ave03, ave05, and ave06, which seem to share the same haplotype) and E1b1b1 (individual ave07). The four markers chosen to confirm belonging to these haplogroups (Y-E1b1b1-M35.1, Y-E1b1b1a1b-V13, Y-G2-M287, and Y-G2a-P15) were typed with a rate of 66%, which permitted confirmation that four males were G2a and one was E1b1b1a1b (Table 3).

Analysis of shared haplotypes showed that the G2a haplotype found in ancient specimens is rare in current populations: its frequency is less than 0.3%(Table S3). The haplotype of individual ave07 is more frequent (2.44%), particularly in southeastern European populations (up to 7%). The Ave07 haplotype was also compared with current Eb1b1a2 haplotypes previously published (10–14). It appeared identical at the seven markers tested to five Albanian, two Bosnian, one Greek, one Italian, one Sicilian, two Corsican, and two Provence French samples and are thus placed on the same node of the E1b1b1a1b-V13 network as eastern, central, and western Mediterranean haplotypes (Fig. S1).
The ancient remains all appeared to lack the common European lactase persistence genotype.

On the mtDNA:
Mitochondrial HVS-I sequences were obtained for the seven individuals and can be classified into four different haplotypes (Table 2). All are still frequent in current European populations (Table S1), and three of them were also found in ancient Neolithic samples (Table S2). These haplotypes permitted the determination that the individuals ave01, ave02, and ave06 belonged to K1a, ave04 and ave05 to T2b, ave03 to H3, and ave07 to U5 haplogroups.
The supporting information (pdf) has a lot of additional information.

PNAS doi: 10.1073/pnas.1113061108

Ancient DNA suggests the leading role played by men in the Neolithic dissemination

Marie Lacan et al.

The impact of the Neolithic dispersal on the western European populations is subject to continuing debate. To trace and date genetic lineages potentially brought during this transition and so understand the origin of the gene pool of current populations, we studied DNA extracted from human remains excavated in a Spanish funeral cave dating from the beginning of the fifth millennium B.C. Thanks to a “multimarkers” approach based on the analysis of mitochondrial and nuclear DNA (autosomes and Y-chromosome), we obtained information on the early Neolithic funeral practices and on the biogeographical origin of the inhumed individuals. No close kinship was detected. Maternal haplogroups found are consistent with pre-Neolithic settlement, whereas the Y-chromosomal analyses permitted confirmation of the existence in Spain approximately 7,000 y ago of two haplogroups previously associated with the Neolithic transition: G2a and E1b1b1a1b. These results are highly consistent with those previously found in Neolithic individuals from French Late Neolithic individuals, indicating a surprising temporal genetic homogeneity in these groups. The high frequency of G2a in Neolithic samples in western Europe could suggest, furthermore, that the role of men during Neolithic dispersal could be greater than currently estimated.

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