Further progress has been made on the DNA front. I may have mentioned
earlier that the comparison between Don's Big Y and that of the Hackett
tester revealed a new SNP, YP4248. This commonly shared SNP indicates
that the Hacketts and the Cooleys had a common ancestor about 800 years
ago. Since then, my Big Y results have arrived and revealed a new SNP,
YP4491, a SNP that Don and I have in common and, perhaps, the most recent
mutation passed down to all of us from John Cooley. One of the CF01 PA
Cooleys is testing for it now. If he doesn't have it, then he's of an
older branch of the family and certainly not descended from John. If he
does have it then we will know only that the line closely related to
John's. In either event, there are other SNPs we can test in order to get
a clearer picture.
I've put together the following graphic, using both SNPs and STRs, to
illustrate how the North Carolina Cooleys may be related to a larger group
comprised of the CF01 Cooleys (PA), Whitfields, Agertons, Hacketts, Starie
(Sterry), and Cochrans, of which there is a large group of matching
testers (One of the Cochrans is testing for the YP4248 SNP.)
http://ancestraldata.com/ahnentafel/256/DNA/YP4248.html
Cochran may be a significant lead. The tester has his lineage going back
to the 13th century, to about the time for the terminus of the YP4248
emergence. There's much about the line that is suspect, especially the
five generations in Ireland, but it could be something we might one day
piggyback onto.
http://ancestraldata.com/staging/cochran.html
Here's an update to our SNP lineage, which includes the other SNPs found
along with YP4248, and those found with YP4491. The important thing to
understand about these blocks is that the mutations didn't happen all at
once. They occurred over time, each one in an individual spaced by about
five generations or so and down the same paternal line. By finding more
testers, a timeline can be sorted out.
http://ancestraldata.com/ahnentafel/256/DNA/cooley-hackett-SNP_table.html
I'm always looking for new ways to explain this stuff. Here are five
slides that try to conceptualize how SNP discovery works via comparative
analysis. But it's a gross abstraction. Nothing in it actually represents
YP4248, the Cooley/Hackett SNP, or YP4491, which might well be specific to
our Cooleys.
http://ancestraldata.com/ahnentafel/256/DNA/findingSNPs_1.html
As always, let me know should you have any questions.
-Michael
- Administrator or Co-Administrator for the following family DNA projects:
Akins, Ashenhurst, Bishop, Eldridge, Fisk, alt-McDowell, Cooley,
McDougall, Pickens, Strother - B.A. Humboldt State University, History,
2013 - Instructor, the Osher Lifelong Learning Institute (OLLI) at HSU
Received on Sat Oct 17 2015 - 19:10:21 CDT