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Archiver > GENEALOGY-DNA > 2008-09 > 1220685800


From: "David Faux" <>
Subject: Re: [DNA] 9RA Autosomal Native American Marker
Date: Sat, 6 Sep 2008 00:23:20 -0700
References: <ea3bd9560809051659n28a52b47od5bb6c87c96ede3f@mail.gmail.com><e2f96c1b0809052108r16fbe4f8v9e074fb34e564f39@mail.gmail.com><ea3bd9560809052129h261240bfxa1d4669fa9c5777b@mail.gmail.com><e2f96c1b0809052226i5432eaf6naf24ae68e79fa26a@mail.gmail.com>
In-Reply-To: <e2f96c1b0809052226i5432eaf6naf24ae68e79fa26a@mail.gmail.com>


Robert:

Every allele (STR and SNP) has a history that could in theory reach as far
back as Africa. We don't generally know when they emerged. However the 9RA
STR allele is telling us a story. Looking at its distribution this
allele must have had its origin in Beringia about 15,000 years ago. It has
an almost exact parallel in the distribution of YDNA haplogroup Q3 and I
would not be surprised if they arose in the same person. Today 9RA is found
only in the areas of Siberia closest to the former land bridge to Alaska.
>From that point it fans out to encompass every Native American group from
the far north to the depths of South America.

I did an analysis of the 19 repeat allele. In the Old World it is found in
Arab Africa, a cluster of Arab tribes in Afghanistan and surrounds, then in
a straight line to a Tibetan people residing in China to Inner Mongolia of
China to the Yakuts and Mongolians to the north and there it stops. Now in
the New World it is found in the Aleutians, across the Canadian Northwest
Territories to the Dogrib and as far as one can go to east with the Innuit
of Greenland. The direction is then central to the Sioux and southwest to
the Chihuahua area of Mexico and finally south to the Maya of the Yucatan
Penninsula and there it stops. There appears to be structure since there is
nothing in Central Asia or Europe or the Pacific Islands but there is a
linear path to or from Africa. If this represents a single founder effect
the question becomes "where was the point of origin"? Was it Africa to the
Arab world to nearby Tibet and Mongolia before crossing the Bering Straight,
or did it start in the Tibetan area and bifurcate eastward and westward.
Either way it must be a very old mutation. I can literally connect the dots
on the map in the article and it shows a definite path to the New World with
no detours. All of this may be just one big coincidence, but the fact is
that there are ancestral informative markers and with D9S919 (D9S1120) it is
possible that not only the shortest repeat allele, but also the longest
repeat allele could be sending a signal that is there to be read. It at
least deserves further study.

David.


On 9/5/08, Robert Tarín <> wrote:
>
> David,
>
> Given the nature of autosomal inheritance, how likely would a particular
> value be passed to someone from a relatively recent ancestor versus from a
> distant ancestor? Take for example a value of 9 for D9S919, I would think
> there is a fair chance to receive it from a grandparent but almost none if
> the ancestor were say 10 generations back. You might have had an ancestor
> with a 9 but never see it today. Isn't this why results are "more is
> better"
> in the autosomal world?
>
> Regarding your 18 being from a European population instead.....you cannot
> really know that for certain. Don't discount it yet for your Six Nations
> ancestry. Looking at the Table 1 percentages it is more likely seen in NA
> or
> Asian populations than Europeans. It's all in the confidence levels of the
> most likely explanation.
>
> Robert
>
>


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