Ashkenazi Genetic Pile Ups?

Well I thought I had found a real cousin on the German Jewish side due to a few common surnames but no luck finding the relationship yet. Sadly there is a large match on our X but the common surnames are not on a branch where X could come from. Of course one of the problems in German Jewish genealogy is that all but a few prominent families had no fixed surnames (they used their father’s name) until 1813/14.

Even worse she mainly matches me on segments that are what I call “Ashkenazi Pile Ups” or locations where there are well over 30 people matching me but not my Dad for more than 5cm.  By comparison I notice only one such pile up on my 100% Norwegian father’s matches at chromosome 9, at about 80,000. But that will be the topic for another post.

These are the three pile ups my new distant cousin matches:

Chromosome 2:  45 matches for this segment at 23andme

150.1 163.3 9.9CM

Chromosome  4: 80 matches for this segment at 23andme

some start at 18.1 and some end at 25.0

19.4 24.8 7.2CM

Chromosome X: about 30 matches for me, 50 for my brother…. hmmm

a few are longer than this

123.4 137.8 14.1CM

For those of you who are wondering where to find this data on 23andme you can download all the segments that match yours with the name of the donor (most will be anonymous) by going to “ancestry labs” under ‘My Results” and clicking on “Countries of Ancestry.”  Scroll down the page to the long blue button where you can download a CSV of all your matches. [updated 27 dec 2013 – n.b. you can get this data and more  by using the site to do the downloads]

There are a few more pile ups in my and my brother’s matches than these …

Continue reading

Ashkenazi Lament

My father is Norwegian (Lutheran) while my mother was German, half jewish and half catholic. So my maternal grandfather was a German Jew, this qualifies his DNA as Ashkenazi. Apparently this group was very inbred to the point where I am finding many many matches at 23andme for my DNA (from him) that are too far back to find the paper trail. And we have most of our jewish ancestors documented back to the late 1700s. To be specific, of my over 1000 matches at 23andme at least 900 or more are Ashkenazi of which over half are Eastern European. As we have no known Eastern European family [correction: one 4th grandfather born in Ukraine plus another unknown], I have to conclude that siblings of our ancestors in the 1500s and 1600s migrated East [correction: much movement back west in the 1600s for example Sulzbach welcomed back eastern jews in 1666]. Our Floss families came there from Austria which deported its Jews in 1420 and again in the mid 1500s according to the Wikipedia article on Austrian Jewish history. Probably at that time other family members went further east.

So far I have found one new 5th cousin through the 23andme site on the jewish side (and that was from a surname scan) as compared to about six new Norwegian relatives. And it seems that the Ashkenazi matches drown out our other German matches. Of course the problem may also be that very few Germans have tested since it is apparently not legal there. Fortunately lots of Norwegians have tested.