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
Chromosome 4: 80 matches for this segment at 23andme
some start at 18.1 and some end at 25.0
Chromosome X: about 30 matches for me, 50 for my brother…. hmmm
a few are longer than this
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 http://DNAgedcom.com site to do the downloads]
There are a few more pile ups in my and my brother’s matches than these …
chromosome 1: 31 matches for this segment
chromosome 1: and 45 matches for this segment
chromosome 2: about 20 or so
to be continued in a future post …. as I find more of these
I googled around and did not find anywhere that listed known ashkenazi genetic segments. Would love to hear if anyone knows more about this. I am sure 23andme has this information as they mark many 3 segment cousins as “distant” so presumably all those segments are known ashkenazi DNA segments.
Edited March 10, 1015 – replaced the incorrect term “hot spot” with the correct term “pile up.” Hot spot has a specific meaning in genetic genealogy which is a place that recombination cross overs happen more often.