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Archiver > GENEALOGY-DNA > 2004-08 > 1091471300


From: "Whit Athey" <>
Subject: RE: [DNA] Markers YCA II a&b
Date: Mon, 2 Aug 2004 14:28:20 -0400
In-Reply-To: <080220041528.27709.410E5D9D000134AA00006C3D2200748184050B989A0E00@comcast.net>


I would agree with David that YCA II is not a volatile marker, though
certainly it should not be surprising in all of our surname projects to find
it changing in a few of them. However, I'm not sure that we can really say
that "R1b is virtually all 19,23." If you do a search on Y-Search using the
modal values for R1b on the first 12 markers and let the rest vary, you find
just under 200 haplotypes, and for 46 of these, data are included on YCA II.
It is certainly true that virtually all YCAII-a are, in fact, 19, but there
is a clear bimodal distribution on YCA II-b. 10 of the 46 haplotypes (22%)
have 19,19. Interestingly, if you do the search again, but using DYS-391=10
instead of the modal value of 11 (plus letting DYS-385 and DYS-389ii vary),
then you find another 218 haplotypes, including 57 with data on YCAII, but
there are no 19,19 values to be found. However, there are a fair number
(28%) of 19,24 in this group.

Whit


-----Original Message-----
From: [mailto:]
Sent: Monday, August 02, 2004 11:28 AM
To:
Subject: Re: [DNA] Markers YCA II a&b

In the available research literature it is clear that YCAIIa,b is extremely
stable - at least in relation to certain haplogroups.
R1b is virtually all 19,23. R1a, which has been the subject of three
studies (Passarino et al., 2002; Quintana - Murci et al., 1999; Passarino et
al., 2001), is largely 19,23. What is particularly interesting is that the
2002 study found that YCAIIa,b is bimodal in Norway for R1a. 9 of 17 had
the motif 19,23 which is virtually universal in all regions of the world
studied to date (studies do not include Central or East Asia). However 7/17
Norwegians had a 19,21 motif which is virtually unknown elsewhere.
The research literature would not support your assertion that this marker
complex is volotile - quite to the contrary.
David.





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