Last update: 28-Jan-2008 11:45 AM
Of our 6 participants so far, we have two with 37 markers
(kits 42234 and 73251), two National Geographic Genome Project participants
with 12 markers (kit N12220 and N49855), and two with 25 markers (kits 43653
and 43663).
It's clear that we have four closely related individuals
from only one distinct family group. Kits 42234 and 43653 are
documented back to their common ancestor, John McCorkle, b. 03
Aug 1734. These two participants match kit 43663 at 24/25 markers
(DYS 464d is 18 vs. 17). It would be most helpful if participant
43663 provided his lineage to his earliest known ancestor so we
can pinpoint the location of the mutation at marker DYS 464d.
The additional row (YSearch.org) is from an entry discovered
in the Ysearch.org database in 2005, although that entry is no
longer available. This person is ostensibly in the FTDNA
database, but thus far has not joined this project. To date, no
info is available about this person's earliest known McCorkle
(MacCorkle) ancestor or his descendants.
Note the top line in the table is the Western Atlantic Modal
Haplotype (or WAMH). This is provided as reference since FTDNA
points out that our current participants, who all match at 12
markers, are only 1 point away from the WAMH (DYS 391 = 10
allels for Group 1, vs. 11 allels for the WAMH). The WAMH is the most common
Y-DNA signature of Europe's most common Haplogroup, R1b. That
means, for research purposes, the 12 marker test is only
minimally useful, at least in terms of identifying divergent
lines of related individuals. In fact, the 12 marker McCorkle
results match 281 other FTDNA customers, none of which have
surname McCorkle or any of its variants. The conclusion, then, is
that for this particular clan, at least 25-marker tests will be
necessary to make any meaningful analysis or comparison of
results.
Notice, for our only family group so far, it has the following
modal marker values: 391 = 10, 458 =
18, 449 = 30, 464a = 13,
and 464c = 16. These values are different from
the WAMH, for which these four markers have values 17, 29, 15,
and 17, respectively. Of special interest, DYS 464a = 13 for only 2% of individuals identified as
having the R1b haplotype. Thus, DYS 464a is
distinctive in identifying members of this clan of McCorkles.