November 01, 2010

Joe Pickrell redux

Joe Pickrell discovers Jewish great-grandparent
Second, Dienekes followed up on his analysis of the ancestry of the GNZ participants with a much larger data set, including individuals of southwest European descent. As expected, when including more data, there was no evidence that Vincent has any Ashkenazi ancestry. Unexpectedly, this was not true for me—even in this larger analysis, the evidence for Ashkenazi ancestry didn’t disappear.

...

As I was mulling over these sorts of issues, I sent the link to my previous analysis to a family member. I didn’t really expect this person to find it that interesting, but hey, you never know. I then got a phone call. I’ll summarize a couple days worth of moderate confusion, second-hand reports of conversations with distant relatives, and family intrigue with this: as it turns out, one of my great-grandparents was indeed a Polish Ashkenazi Jew who immigrated to the United States around the turn of the century. I, obviously, was completely unaware of this.
So to conclude, a tip of my hat to Dienekes and everyone else who looked at these data—this has been the first genuinely unexpected thing to come out of my genetic data.
I've estimated Joe's ancestry here and here.

He is included in the Dodecad Project's spreadsheet as JKP001.

His "Southwest Asian" score of 6.7% is consistent with but not indicative of Jewish ancestry, as this component is found in West Asia and Europe, although it attains its maximum in Saudi Arabia and occurs at about 20% in European Jews.

So, while I wouldn't conclude that he had partial Jewish ancestry based on his data, the issue is no longer relevant due to the emergence of the new genealogical information.

This is an example of what I called "cryptic ancestry" as a possible explanation for people getting unexpected results.

9 comments:

pconroy said...

Very interesting indeed!

My wife's 100% Sicilian grandmother DOD097 results are in, and she is 17.5% South West Asian. This component is strongest in Saudis, but should it be labelled Arab, Semitic or Jewish?

Anyone have Southern Italian or Sicilian results in??

Dienekes said...

Italians (including Sicilians) can be distinguished easily from Jews, despite the high SW Asian values.

Personally, I don't want to call the SW Asian component anything else at present. I think the inference Semitic=> presence of SW Asian component is valid, but I'm not sure about the inverse presence of SW Asian component=>Semitic.

onur said...

Personally, I don't want to call the SW Asian component anything else at present. I think the inference Semitic=> presence of SW Asian component is valid, but I'm not sure about the inverse presence of SW Asian component=>Semitic.

If we assume that the Anatolian urheimat hypothesis of Indo-European languages is true, then most probably the expanding early Indo-Europeans had the SW Asian component, albeit in lesser amounts than Semites but more than Caucasian-speakers and non-Indo-European-speaking Europeans. As the Indo-European people advanced throughout Europe and admixed and assimilated the natives, the SW Asian component would decrease in amount, which is what we see in the SW Asian component distributions: the SW Asian component decreases as a function of the distance from Anatolia among the IE-speaking populations of Europe and drops to 0% in farthest (to Anatolia) IE-speakers and in non-IE French Basques.

Spy said...

Bravo! I knew that the 300, though few, were selective enough to valiantly stave off the hordes of ethnological agnosticism.

More SNPs are nice, but the quality of their ancestry informativeness is what's critical!

Ponto said...

You call it what you like. Southwest Asian gets it a location where it is common today. Semitic is really linguistic, and frankly something best left in the Bible with Shem and the rest of the Biblical cast of characters. Arab is really meaningless as Sudanese are Arabs, Moroccans are Arabs, some Iranians are Arabs..it is too removed from the Arabian Peninsula.

I am Maltese, 100%, no foreign ingress for at least 600 years, and I am 13.6% SW Asian. I am DOD043. My RF cousin from 23andMe, who is Greek from the Ionian islands near Albania, quarter Maltese, our relationship dates back to the early 1700s via two woman who were sisters, he is 10.8% SW Asian.

On MDS plots, South Italians and this Maltese are lumped with the Jewish folk but we can be separated on different dimensions.

pconroy said...

Ponto,

Are you sharing on 23AndMe, as my wife and her Father (50%Sicilian/50%Polish) both have Maltese RF relatives, who haven't responded yet?

Also, your admixture results are very interesting, how do you think you would have gotten the 0.6 NE Asian? My wife and her Dad share with a RF who is 100% Sicilian, but Y-DNA Q1b. Which is:
http://en.wikipedia.org/wiki/Haplogroup_Q_(Y-DNA)

Q1b M378 — Found in 5% of Ashkenazi Jews and with low frequency in Pakistan among samples of Hazaras and Sindhis and Uyghurs of North-Western China


He thought that it may have gotten to Sicily via the Muslims??

pconroy said...

Just took a look at Leon Kull’s HIR Search site – where he has uploaded the 12 Genomes Unzipped members, and strange as it sounds, I’m “related” to 5 of the 12:
1. Jeff Barrett – 4 segments – 3rd closest relative – after my parents 1st and 2nd
2. Joe Pickrell – 3 segments – 8th closest relative
3. Don Conrad – 2 segments – 20th closest relative
4. Ilana Fisher – 2 segments
5. Daniel MacArthur – 1 segment
Who knew…

BTW, when I check my Parents (Michael Conroy and Margaret Conroy), I see that additionally, my Dad is related to:
Kate Morley – 2 segments
Jan Aerts – 2 segments

And my Mom is related to:
Jan Aerts – 2 segments

Actually each of my parents are related to:
1. Joe Pickrell
2. Jan Aerts
3. Daniel MacArthur
4. Ilana Fisher

It's a small world out there - or else there is some convergence between all these people and my family??

By the way, if you search under "Joe Pickrell", he is related on 2 segments to Dan Vorhaus and some of the others too. Same for the others, they are all interrelated!

Helen said...

I am "related" to 7 of the 12 GU members ON THE HIR SEARCH DEFAULT THRESHOLD SETTINGS which are not very high. I believe only one of them, Joe Pickrell, would pass the RF threshold settings (seem to be >7cM and >1000 SNPs in my experience) and I believe he is one of my unidentified RF matches. There was also an issue which is a bit over my head about Leon changing the cM threshold from 5cM to 4cM recently which resulted in the newer uploads like these guys having a lot more matches than the rest of us.

pconroy said...

Helen,

The settings I was using are the default settings too. But, yes, since Leon lowered the bar - to get at deeper ancestry - my number of people matching segments has almost doubled.

When I have time, I will go into detailed view and see if any of these are matching >= 7cM and >= 1,000 SNP's, which is considered 5th cousin range by 23AndMe. But remember that if 2 people both have a trace of Jewish ancestry, then they are likely to match on a number of small segments - whether they are related within 10 generations or not.