[APG Public List] [APG Members] Exciting New Dimension for DNA
scott at appletree.com
Thu Oct 29 16:59:56 MDT 2009
what a great story Joan! I'm going to have to try 23andme now. I'm just
curious about one little thing, you wrote, "what we share is a mind-boggling
match on the X chromosome--through his mother (his only X) and my X
inherited from my father." What did you mean by "his only X?" I assume you
mean his mother's only X?
On Thu, Oct 29, 2009 at 3:16 PM, <JYoung6180 at aol.com> wrote:
> Last November I had my DNA tested with 23andme.com. I had never felt (as
> a female) that there was much value for me in being tested for mtDNA only
> because I know so little about my straight maternal line other than that
> they came over from Northern Ireland in 1852. Yes, I have a few surnames but
> not far enough back to really be able to compare with anyone and learn
> anything meaningful. In any case, it never really interested me to learn
> ONLY about this one tiny sliver of my ancestry. I wanted to learn about the
> whole enchilada! Plus I knew I would at least learn some medical information
> by being tested with 23andme.
> I was pleased at the time with all the information I got from the test.
> Learning I was a fast metabolizer of caffeine and could probably safely
> drink all the coffee I wanted without harm (and possibly with benefit) was
> worth it in and of itself. <g>
> But alas, I digress...what I wanted to post about is a new beta tool
> introduced this week by 23andme that is nothing short of astounding for
> genealogists! Until now, we mostly could only learn about mtDNA for
> everyone and Y-DNA for males (or if you had a male relative who fit the bill
> and would be tested). Since 23andme tests the entire human genome (not all
> genes obviously, but the most important ones in their judgment) there is a
> lot of X and autosomal DNA information in our files. Since autosomal DNA
> doesn't tell you which parent it came from it wasn't considered all that
> helpful (by current standards) for genealogical purposes other than to help
> pinpoint ethnicity to some extent.
> However, the new beta Relative Finder using a new improved algorithm could
> possibly be about to blow the lid off autosomal and X genealogical matching.
> A couple days ago I set my account privacy settings to allow others using
> the beta tool to contact me and so did some others who have been tested with
> I scrolled through my list of people who were identified by the tool as
> being anywhere from a 3rd cousin to a "distant cousin." I think they draw
> the line at about the 10th cousinship as being "distant." It looks like
> anything up to 5th cousins they consider close. they give you a probable
> relationship and a range, and tell you how many segments you share with
> another person. At the top of my matching list was a male in the US who
> matched a total of 1.03% of my total DNA. We shared two matching segments
> and were identified as probable 3rd cousins with the range being 3rd to 5th
> We contacted each other and compared family histories and guess what? The
> relative finder was dead on! We are 3rd cousins. Our great-grandmothers are
> sisters. Now, keep in mind that this is a match that would NEVER have been
> made by Y or mtDNA testing...his mother's father's mother and my father's
> mother's mother are the sisters. There would be no shared mtDNA nor Y DNA.
> Now that we've compared our data what we share is a mind-boggling match on
> the X chromosome--through his mother (his only X) and my X inherited from my
> father. our match on this chromosome is greater than 90%! To top it off,
> his mother is still living and she's now going to be tested and we will
> compare. She is my 2nd cousin once removed. We also share a substantial
> segment on chromosome 2 and have inherited similar traits that are carried
> on chromosome 2--endurance to name one.
> I have another person I match with .78% of my total DNA and with whom I
> share FIVE matching segments and who is identified by the Relative Finder as
> being a probable 3rd cousin and no further back than 4th. So far, this
> person hasn't opted to join the beta test group but he (also a male in the
> US) is ALSO listed as a close cousin for the cousin I have made contact
> with--and so is possibly from the same branch of the family.
> APG Members Only Mailing List
AppleTree - Family Tree of the World
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