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African American DNA Research Forum

Re: DNA Tribes New Populations
In Response To: Re: DNA Tribes New Populations ()

Hey Sherry!

I thought I wouldn't let you go it alone, so I also got an update.

Top Native 20:
Catalan, Spain
Flemish
Belgian
Bavarian (germany)
Flemish (belgium)
Portuguese
Norwegian
Buddhist (Ladakh, India)
South Poland
Sicilian
Belgian
Serbian
Hungarian
Austrian
German
Swiss
Cheuta, Spain
Norwegian
Russian
Portuguese

Top 20 Global:
Catalan, Spain
Caucasian
Flemish
Belgian
Portuguese
Bahia, Brazil
Norwegian, etc. I won't list them all, but not a sub-saharan african in the group.

My Continent Match, Sub-saharan african, Asia Minor, European,and East Asian.

I wrote to Dna Tribes and asked them what all this meant and here's what they said:
* "As we refine our analysis with better definitions of regional groupings, we are able to tighten our Continent Match scoring system. Your updated results reflect this tightened scoring system, where "1" is the Generic Human Threshold. Scores below 1 indicate your profile is more likely in a world without regional groupings than in major geographical regions as they exist today.

All of your scores are very close to your threshold, which suggests a blending of ancestry from more than one major region. Your matches include Sub-Saharan African 1.6, Asia Minor 1.0, European 1.0 and East Asian 1.0. This indicates that your genetic profile overlaps slightly with each of these regional groups and that deep ancestry from each of these regions is possible.

However, this tightened threshold allows me to now say that your match with the Buddhist population in Ladakh does likely indicate some shared East Asian and Asian Minor ancestry in addition to ancestry generally typical of European populations."*

I asked them why all of my top 20 results were european, this is what they said:

* "Your Native and Global matches show the particular populations where your profile is found. As you note, these are mostly in Europe (with the exception of Ladakhi Buddists). This indicates that the best place to find your blend of regional ancestries is in Europe.

The difference between Continent and Native/Global Matches is this: Native/Global matches reflect actual populations as they exist today. In most populations, some influence from more than one regional group can often be found, if only at a low frequency. Continent Match is more abstract, so "European" results there reflect what is unique to Europe as opposed to other regions and not just particular populations. "*

I asked why my original top 10 scores got shuffled around when the top 20 were added, I asked why the top 10 didn't just remain the top 10 with the additional 10 added on at the bottom. Plus, I wanted to know if they suggested that Catalan, Spain is the location where I should start to look for my ancesters and here was their response:

* "Dr. Valaitis has refined our algorithm to take additional factors into account when assigning scores for each population. This can lead to some subtle re-shuffling of scores, especially when they are of similar magnitude.

Your top 20 scores range from 10.1 to 4.8, which is only a moderate difference in likelihood. Your genetic profile is approximately 2.1 times as likely in Catalans as in Portuguese, and can be found throughout Europe. However, we do observe a general trend of stronger matches in Northwest Europe, which suggests your deep ancestry is most typical of that particular region. Your top score with Catalans does suggest your genetic profile is most typical of that population; but the relatively slight difference from your next score (10.1/9.0) indicates other populations should not be ruled out."*

I know this is a lot of information, but if any of you have any ideas about this or suggestions, I'm all ears.

For my part, I do know that there where many africans in spain even prior to the trans atlantic slave trade. But wouldn't my DNA pick up some of this information, or is it perhaps that DNA Tribes just hasn't got those populations yet. But, I mean, how many populations were affected by the slave trade? I thought most came from western and central africa and it seems that DNA Tribes has pretty good populations for these individuals, or am I missing something? I thought perhaps Northern Africa might be what's going on with me, but I only got a .6 for Arabian and Northern Africa. And what's with all the caucasian - in my top 20 Global, I had 7 caucasian, the rest european. I know that caucasian, doesn't always mean "white skin" so perhaps that's what's going on here too. Believe me, I'm proud of all my ancestry, but I'm just trying to put the puzzle pieces together. I've got an old black and white picture of my great grand father, with long straight white hair and looks to me to be blue or very light colored eyes - he looks white to me. But, when I found him on the Lousisana census, he was listed as colored - what's that?

Oh, one last thing...here's what they had to say about the Continent match:

"Currently, both our database and our algorithm are proprietary and unique to our company. However, all populations in our database are peer-reviewed data. Our technical director is Dr. Eduardas Valaitis, who is a professional statistician and Professor of Statistics (graduate of Yale University). All refinements to our calculation method are subject to his control and approval and informed by his expertise.

The highest and most unique level of information we currently provide is our Continent Match analysis. This is based on a meta-analysis of our population database. For instance, "European" scores reflect tens of thousands of individuals from across Europe, and in particular the genetic ancestry that is unique to Europe as opposed to other regions. Both high and low scores are informative, since low scores indicate inter-regional contact, usually with particular regions."*

Feedback/comments???


18 Dec 2002 :: 14 Nov 2008
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