To: pike-dna-l@rootsweb.com
Date: Tue,  8 Jul 2008 08:51:13 -0230 (NDT)
From: dapike@math.mun.ca (David Pike)
Subject: [PIKE-DNA] Another Result for Group 1


Hi everybody.

This news bulletin only has a single new result to report, for a participant
with kit number 121686.  He tested for 25 markers, for which his closest Pike
match is with James (kit 62921) in our project's "Group 1" clan.  James
and 121686 are a 23/25 match, and so 121686 has now been included with our
collection of "Group 1" results at:
http://www.math.mun.ca/~dapike/family_history/pike/DNA/index.php?content=results.html#Group1

At the 12-marker level though, 121686's closest match is with Brian (N51451),
for whom we only have 12 markers available.  Both Brian and 121686 share a
marker value of 9 on the 4th marker (formally known as marker DYS-391).
Everybody else in our Group 1 has a value of 10 for this marker, which
suggests that Brian and 121686 might belong together on a sub-branch of
the overall family tree for our Group 1.

Something else of interest is that within our Group 1 clan, we now have
a set of six people that could be lined up so that when we look at just
their first 12 markers there is a single mutation between consecutive
people, meaning that the people at the two ends actually have 5 differences
between their particular markers.  To see what I mean, take a look at
the results for these people:

  Richard (93897)
  Ed (61276)
  Roy (31483)
  James (62921)
  Brian (N51451)
  121686

and you'll see that Richard and Ed differ on just one of their first 12
markers, Ed and Roy differ on just one marker, etc.

Hypothetically, if the only two results that we knew about from our Group 1
were for Richard and 121686, we might conclude that they're not related
because differing on 5 of the first 12 markers would normally rule out a
relationship.  Indeed, FamilyTreeDNA's guidelines on the interpretation
of close 12-marker matches at http://www.familytreedna.com/GDRules_12.html
states that a 7/12 match typically leads to a "Not Related" conclusion.
However, thanks to the several people with results that are in between
those of Richard and 121686, we are able to string together a chain
of 11/12 matches (many of which are close matches at 25 or more markers)
and therefore say that Richard and 121686 do belong in the same family tree,
even though I would reckon that they're in separate branches of this tree.

As far as I know this is the first example of such chain of six people,
not just in the Pike project, but in any project.  The best that I've
heard of elsewhere is a chain of four people, with the two at the ends
having 3 differences between their DNA results.

- David.