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Archiver > GENEALOGY-DNA > 2008-01 > 1199987420


From: "William R. Drake" <>
Subject: Re: [DNA] R1a1 DIfferences
Date: Thu, 10 Jan 2008 17:50:20 +0000
References: <2dff56a0801091733l4ef303eme37318d7fc813991@mail.gmail.com>
In-Reply-To: <2dff56a0801091733l4ef303eme37318d7fc813991@mail.gmail.com>


Colin, There are a few of us that are interested in R1a1 in northwestern Europe. There is little actual analysis of R1a1 itself in Britain at this time, apart from what is sometimes discussed on this list.

Ken first noticed the unusual clade 388=10 R1a and some of the other modal values of it in Britain. 492=14 -rather than 12- is another key marker. Ken has also defined some other major clades of R1a1 as well. Of R1a in Britain and Scandinavia, roughly 5-10% or so are 388=10, with very few 388=11 at all. It also seems to be somewhat evenly spread along coastal Norway, based on Dupuy's data. In addition, it appears in Belgium, the Netherlands, northernmost Germany, Denmark, and Finland. In another words, it seems to be mainly clustered around the perimeter of the North Sea and the English Channel.

The 388=10, 464=12,14,14,17 modal of the 388=10 R1a (perhaps a third-to-half of all 388=10 R1a) is dominant in England, probably because of a strong sampling bias, but it also occurs around the North Sea rim. But clear spatial trends are not clear, because extended haplotypes are necessary for identifying the 388=10, 464=12,14,14,17, 492=14 modal - and those just don't appear in the literature yet. The only clear trend that I see is that 388=10 R1a is virtually nonexistent in northern Britain and Iceland.

388=10 R1a probably emerged in southern Norway or Denmark and then spread around the North Sea rim long enough ago to now account for roughly 5-10% of all R1a around Britain and Scandinavia. The Viking colonies of Northern Britain and Iceland evidently did not source from a region that contained the 388=10 R1a clade. The 388=10 R1a in Britain is very much limited to the south, with some along coastal Ireland. This suggests to me that it arrived in Britain from of a more "southern" source, such as Danish Vikings. Perhaps its presence in Friesland is an important clue.
- Bill

> William,> You must be one of the aficianados Ken mentioned. Where can I find> analysis of R1a data?> Cheers,> Colin Ferguson
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