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Archiver > GENEALOGY-DNA > 2003-05 > 1052097936


From: David Faux <>
Subject: Re: [DNA] False Postive Native American Findings (was Truce!)
Date: Sun, 4 May 2003 18:25:42 -0700 (PDT)
In-Reply-To: <007c01c312a1$59be6370$2ed2f1d0@oemcomputer>


Steve: Maybe there are no false positives. AncestrybyDNA would certainly make that point. Certainly a couple of individuals from England could show positive for NNA due to limited migration from North American - but what if substantial numbers of those with proven English genealogies who were born there started showing up with 15% NNA? Isn't it interesting that there does not seem to be any sort of issue or "problem" with respect to African alleles - there seems to be no doubt that when African percentages appear in the results of the DNAPrint test, they are likely a close approximation of the true value. I have made this point before, but the test is excellent at differentiating between African and any other type of allele (among the four groups being assessed). I personally am convinced (at this point in time) that any NNA value found in the results section means that those alleles are there - but I am open to looking at data from those who can demonstrate that the re!
sults are very very unlikely. It would appear, however, that most of the Listers are from the USA, and if their family has been here for any length of time, some admixture with NNA or African is likely (as is the case in my family). David.

Steve Williamson <> wrote:Wait a minute...what are the specific cases where a "false positive" can be
proven? For a European to show some East Asian, or an American to show
Native American is totally to be expected from history. Each case would have
to be laid out in great detail, and include paternity tests, too (sorry, not
implying anything, but that's a human reality).

American Indian or African results in English people are not impossible,
either. People from those groups have moved to England, both involuntarily
and voluntarily. There was in the 18th century a rather large black
population in England, which has been mostly absorbed into the British white
population. Indian slaves, for example, were taken in not insignificant
numbers to Europe in colonial times. The Vikings even brought back Eskimos &
Greenlanders to Scandinavia. I can provide sources for those statements, if
anyone's interested.

Would that show up now? I don't know, but the point is, it's hard to prove a
negative...

Steve W.


----- Original Message -----
From: "David Faux"
To:
Sent: Sunday, May 04, 2003 7:41 PM
Subject: Re: [DNA] False Postive Native American Findings (was Truce!)


> Hello Thomas: This is getting even more interesting. You will notice that
I have changed the header to reflect a new line of discussion brought up by
your findings. So, not only do we have large potentially false positive
East Asian values, but now we are seeing false positive Native American
findings! Now I am getting more purturbed. The results of my family
testing (we have documented low levels of NNA so my 3% is not out of line -
but my uncle with 8% EA, and a cousin with 15% NNA - all very confusing),
let alone Nancy's findings, and I am not sure that we can turn to the "laws"
of genetics to explain these findings. Someone should be keeping track of
these false positives. I would like to hear from anyone else who is quite
certain that they have no NNA ancestry (e.g., both parents born in England),
but have come back with a positive reading. The plot thickens. David.



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Dr. David K. Faux, P.O. Box 192, Seal Beach, CA, 90740, USA




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