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Within the last few months, the genetic genealogy community has placed a new SNP (L21 / rs11799226) on the Y chromosome phylogenetic tree downstream of the most frequent western European haplogroup (R1b). Preliminary results suggest the overwhelming majority of Irish R1b carry the mutation, while L21 is absent in the Iberian samples and subclades tested so far. R1b from England and continental northwestern Europe seem to be split between L21-derived and L21-ancestral. It's still early and I'd like to see more data, but I think L21 (and thus the direct male ancestor of the majority of the Irish) most likely originated in northwestern Europe. The supposed link between the Irish and Iberians was built on the high frequency of R1b Y-DNA in both regions. The autosomal and mtDNA data never supported any sort of special or close relationship between "Celts" and Basques; it's now clear that Y-DNA doesn't, either.
The assertion, that the Basques and British Celts have an especially close genetic connection is proving to be false.
Basques can trace their roots back to the Stone Age and are one of Europe's most distinct people, fiercely proud of their ancestry and traditions. The research adds to previous studies which have suggested a possible link between the Celts and Basques, dating back tens of thousands of years.
"The project started with our trying to assess whether the Vikings made an important genetic contribution to the population of Orkney," Professor David Goldstein of University College London (UCL) told BBC News.
'Statistically indistinguishable'
He and his colleagues looked at Y-chromosomes, passed from father to son, of Celtic and Norwegian populations. They found them to be quite different.
"But we also noticed that there's something quite striking about the Celtic populations, and that is that there's not a lot of genetic variation on the Y-chromosome," he said.
To try to work out where the Celtic population originally came from, the team from UCL, the University of Oxford and the University of California at Davis also looked at Basques.
"On the Y-chromosome the Celtic populations turn out to be statistically indistinguishable from the Basques," Professor Goldstein said.
The comparison was made because Basques are thought by most experts to be very similar to the people who lived in Europe before the advent of farming.
"We conclude that both of these populations are reflecting pre-farming Europe," he said. Professor Goldstein's team looked at the genetic profiles of 88 individuals from Anglesey, North Wales, 146 from Ireland with Irish Gaelic surnames, and 50 Basques.
"We know of no other study that provides direct evidence of a close relationship in the paternal heritage of the Basque- and the Celtic-speaking populations of Britain," the team write in the journal Proceedings of the National Academy of Sciences.
But it is still unclear whether the link is specific to the Celts and the Basques, or whether they are both simply the closest surviving relatives of the early population of Europe.
What is clear is that the Neolithic Celts took women from outside their community. When the scientists looked at female genetic patterns as well, they found evidence of genetic material from northern Europe.
This influence helped even out some of the genetic differences between the Celts and their Northern European neighbours.
http://www.protogermanic.com/2011/08...irish.html?m=1
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