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Genetic Genealogy for Jewish Ancestry and Overcoming Endogamy in DNA - Genealogy Tutorials

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In this genealogy tutorial I go over different tricks and tips to help those conducting genetic genealogy for Jewish ancestry. Many people with Jewish ancestry have a lot of difficulty with their DNA test results and identifying significant genetic matches. While the largest hurdle in Jewish genealogy is just the lack of documentation going back in time, Jewish genetic genealogy also has the hurdle of endogamy. Endogamy is defined as the custom of marrying only within the limits of a local community, clan, or tribe. While incest is a form of endogamy it doesn't mean just incest, it is often just being a cousin to someone in a few ways through different lines.
The way to overcome endogamy and locate significant matches is by focusing on the number of segments and/or the largest shared segment. The reason for this deals with genetic inheritance and the recombination of DNA with each generation. The further away of a relation someone is then you can expect smaller amounts of shared DNA because each generation only inherits part of the DNA after recombination. So if a match is an endogamous relation who looks like a 3rd cousin in shared cM but is actually much more distant of a relative, in a few ways, then we would expect them to have more segments at smaller sizes than a true 3rd cousin. There are two methods to apply this and identify significant matches, but which method you use depends on the website where your test is located. The first method is the largest segment method where you just look at matches by the largest shared segment, focusing on large segments over 20 cM. The second method is the ratio method, where you use a ratio of 'total shared cM:# of segments' at a number of 10:1 or better.
Ancestry DNA - Ratio Method
23andMe - Ratio Method
Family Tree DNA - Largest Segment Method
MyHeritage DNA - Ratio Method or Largest Segment Method
Gedmatch - Largest Segment Method
Once significant matches have been identified, then the hard work begins to figure out HOW they are are related. You'll want to work to build their family tree, even if one isn't provided with their DNA match results. To figure out which lines you are related through you can use the x-chromosome inheritance or by looking at shared matches.
Check out these other videos to see how these are applied in real cases;
* DNA and Immigration Records - • Using DNA and Immigrat...
* Confirming Genetic Genealogy - • Confirming Genetic Gen...
* Kiev Genealogy using DNA - • Kiev Genealogy Researc...
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Genetic Genealogy for Jewish Ancestry and Overcoming Endogamy in DNA - Genealogy Tutorials
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18 авг 2024

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Комментарии : 45

@TheRanaro 4 года назад

Dude...you're a lifesaver! Thanks so much for your important vlogs and information.

@Historian212 5 месяцев назад

Came here from the video about the new endogamy tool on GEDmatch. Very exciting development.

@RichardWerbin 5 лет назад

Many thanks. This is a very clear discussion of a difficult dna topic. The tips on the multiple dna test sites for identification of a near match to investigate are all useful.

@GeneaVlogger 5 лет назад

Thank you Richard. Glad you found it useful!

@AncestryNerd 2 года назад

Another great video. I have found that the ratio method works well for people who are less than 25% Jewish. I was able to paper trail a cousin who has a ratio of 6. The experience is much different than when using 100% Jewish matches. I find the algorithm chops out a lot of the lower cm matches which can put people at a disadvantage. It’s easier to find the connect with someone who is 25% or less than someone who is 100% because there’s less branches to follow

@ettinakitten5047 2 года назад

5:40 I saw a research study use a similar method with Dominicans to determine the timing of ethnic admixture in their ancestry. Specifically, the African ancestry in that population was found to come from two distinct sources - an older coastal West African source followed by later West-Central African, matching up with known history of the triangular slave trade (initially raiding coastal settlements, and then later tapping into existing slave trade networks within Africa that drew from more central populations). After reading that study, I immediately looked at my own DNA results and confirmed that, unsurprisingly, my Neanderthal admixture is considerably older than the mixing between British/Irish and French/German in my ancestry.

@amandaewoldt8205 2 года назад

Thanks. I've been wondering why I ancestryDNA tells me my known relatives have closer relationships than they do!

@tallthinwavy3 2 года назад

Thanks. My paternal Lumbee side has cousins marriages. Video is very useful.

@saspen3 Месяц назад

Thanks Jarrett for that vital info on endogamous genetics. Being of mixed Polynesian and European descent it has been so frustrating trying to weed out the 'false positives' in the cluster graphs. Its like I'm related to every Polynesian on the planet! I know we're related 'somewhere' but I was hoping to get more precise confirmation of genetic matches. One thing I'm confused about is the latest My Heritage update completely changed my dna results! Can email you my gedmatch kit number and both old and newly updated ethnic percentages to you? I'd really appreciate a little advice as to how to understand my results. I also have gedmatch kit numbers for my sister and our 3rd cousin (who also shares our German/Swedish heritage on our father's maternal side, though my sister and I, have German/Danish heritage on our mother's maternal side as well). We also have English admixture on my Dad's paternal line. Trying to see the forest for the trees!

@sasapapapote 4 года назад

I'm 12% sephardic jew (Family Tree DNA test) - and my mt-DNA is X3a founded in Druze people, Tunisia (North Africa) and Asturias (Spain). The route of Sephardic people. Lol.

@TheExtraTerrestrial 4 года назад

Thanks, man. Very helpful! I'm trying to figure out where my 8% Ashkenazi comes from, and it's proving to be very frustrating. Maybe this will help. P.S. Nice keyboards =)

@AncestryNerd 2 года назад

How’s your search going?

@TheExtraTerrestrial 2 года назад

@@AncestryNerd I figured out it's my grandpa who is 1/4 Jewish (he took the Ancestry test). I believe his grandpa was 100%. However, I can't find his name. His grandma had a child out of wedlock with this man. I found the birth record, but there is no one listed as the father. At this point, I'm hoping maybe someday a strong match will show up on one of the DNA sites, and I can figure this out. So far, only tons and tons of distant matches.

@julieb8730 2 года назад

I had no idea I had any Jewish ancestry until 23 and me and apparently its 27 percent of my genes is Ashkenazi Jewish from my dads side who is about 48 percent. He grew up in a catholic family whos father immigrated from Germany in 1902.

@WilliamFGilreath999 4 года назад

On AncestryDNA I have a 2nd cousin once removed with whom I share 46cM across 5 segments. We are 33 and 34 percent European Jewish respectively. On 23andMe I share 71cM across 6 segments with a different 2nd cousin once removed. The Ashkenazi Jewish percentages are 35.3 (beta) and 48.6. I had a 2nd cousin once removed on MyHeritage, but he no longer shows up in my match list. It was a pretty strong match, as I recall. Pretty sure it was over 200cM and several shared segments, but I can't be certain. I'm not aware of any close AJ cousins on FTDNA.

@uptergroveGreg 5 лет назад

Thanks, always enjoy your informative videos! My maternal side is French Canadian, and there is a lot of endogamy there too. The one saving grace that makes it a bit easier is that Québec church records are well documented and go back to the founding of New France. Have you found DNA Painter helpful in isolating the larger segments and assigning them to your various ancestors?

@GeneaVlogger 5 лет назад

Yes, even with my Jewish ancestry I have been able to assign segments quite well, especially for my Dutch Jewish ancestry which is well documented back to the 16th an 17th centuries. One thing that is really nice about DNA Painter is you can assign confidence levels to each individual segment and also set limits for it to ignore smaller segments (it is automatically set at 7cM).

@uptergroveGreg 5 лет назад

GeneaVlogger I know you have done videos on DNA Painter before, but I’m wondering if you have some pro tips you could put in a video on some advanced techniques. I’m thinking for example a case study where you map two cousins who match you with some overlapping segments, and from the paper trail, you can assign those segments with certainty. Leading to discuss about assigning confidence levels to segments, something I have not done but am curious about. Another case study that would be interesting to see play out on video would be how you take an unknown match, find an overlap to a segment in DNA Painter, then track down the paper trail connections using that ancestor as a starting clue. Just ideas I’m throwing out. Keep up the great work!

@GeneaVlogger 5 лет назад

Thank you for the ideas! I will definitely keep them in mind. The first case study you mention sounds somewhat familiar to some information I have in my first DNA painter video. I don't go into depth with the case but I discuss how you can see overlapping segments from multiple distances of relation, thus allowing me to confidently assign parts of the segments to older ancestors.

@zigm7420 2 года назад

I know this is a older video, but I just found your channel. Thanks so much for making the topic of endogamy a little clearer. One side of my family is quite endogamous (I found one match I’m related to 6 different ways - so far) and I’ve been having a very difficult time sorting out the significant matches, You’re a lifesaver!

@GenaGilder Год назад

Oh! like how I found out through ancestry that my 1st cousin is related to me on what has to be my father's side of the family because we had a cousin that wasn't related to our maternal side of the family-our mothers who are sisters. Now I get it.

@object-official Год назад

My Paternal Grandmother is Half-Jewish, because she did a DNA test. Her Paternal line is Jewish, and her maiden name is Goldflies.

@object-official Год назад

Eastern European Jewish.

@PC-lu3zf 3 года назад

I’m Jewish this is helpful

@PC-lu3zf 3 года назад

If you look at Gedmatch all full Ashkenazic people match everyone else who’s Ashkenazi I’m half Ashkenazic half Sephardic the Sephardic is less endogamous in my family. Ashkenazi people should ignore matches who don’t share at least one long 19 or longer CM segment.

@AncestryNerd 2 года назад

I disagree. I have been able to find my Jewish cousin matches as low as 6cm

@willrundle2 2 года назад

If someone is Austrian Jewish, are they actually Austrian too or are they just Jewish?

@JasonTHutchinson 2 года назад

It was not uncommon for first cousins to marry in the royal family. This happened over multiple generations such as with the Habsburg's.

@TheExtraTerrestrial 4 года назад

P.S. One of my best Jewish matches on 23andme is 0.41% DNA shared with 4 segments, which doesn't quite meet that 10:1 ratio. However, it thinks we could be 3rd cousins. Is it unlikely we can figure out how we're connected? Unfortunately, I haven't found any really solid leads on any of the sites.

@GeneaVlogger 4 года назад

Have you uploaded your results to Gedmatch, FTDNA, and My Heritage? It is free to do so and you may find more significant matches in those databases. If this is something you are really set on figuring out then buying a kit through Ancestry may be something to also consider since that is the largest database so you have the best chance of finding significant matches on there.

@TheExtraTerrestrial 4 года назад

@@GeneaVlogger Thanks. Yep, I did Ancestry and 23, and then I uploaded the raw data to FTDNA, MyHeritage and also GED. I have a few leads, but nothing really solid so far. Most of the Jewish matches that show up are very distant. One other quick question: does that 10:1 ratio guideline still apply to matches with very few segments? Say there is a match where we share 20 cM, but only 1 segment. That would be a 20 to 1 ratio. Not sure if those are worth investigating?

@GeneaVlogger 4 года назад

The 10:1 ratio guideline doesn't really apply as well (but can still be useful) once you get below 40cm because the possible relations become too many (they could be as close as a 2nd cousin or as far as an 8th cousin). Once you are able to determine your Jewish ancestor and build out that family tree then those smaller cM matches will come into play in expanding your Jewish ancestral lines. The main thing at this point is finding your most significant Jewish matches at high rates (100cM or more) to see if you can find specific families or specific towns popping up with different matches. Since you mentioned it likely being through a 2nd-great grandfather that means your closest Jewish matches would be about half-3rd cousins (assuming your unknown Jewish 2nd-great grandfather has other living descendants), which range in shared cM from 0-178. If you are younger then you may luck out in finding a half-2nd cousin once removed or maybe even a half-1st cousin twice removed. Remember too that just because a match has Jewish ancestry that doesn't mean you have to be related through their Jewish ancestry, so check their ethnicity admixture results when possible to see are they close to 100% Jewish or if they have some other ethnicities that could be the source of your relation. I would suggest making a list or excel spreadsheet showing the surnames and towns of origin for your matches with Jewish ancestry. Start to look for patterns, most especially the same surnames coming from the same regions.

@TheExtraTerrestrial 4 года назад

Sounds like a good plan, thanks! At this point, I haven't found any Jewish matches with 100 cM. I think most have been 50 or less. I'll keep trying, though.

@PC-lu3zf 4 года назад

Join the club I match every Ashkenazic person on gedmatch some with big 20 centimorgan segments but no clue from where. Endogamy needs ending I married a non-Jew.

@rachelstrahan2486 2 года назад

👍

@rivkyb7840 4 года назад

I just got my DNA from ancestry and I am 100% European Jewish (Ashkenazi of course). and it doesn't say which country....

@GeneaVlogger 4 года назад

Unfortunately these tests do not have the capabilities to tell you what country your family lived in (even though the commercials seem to lean push that idea), they can only make inferences about certain population groups you descend from. If you descend from a population group that is located in one region, then it is easy to infer likely countries where those ancestors lived. If you descend from a population group which has been all over the World with almost no genetic variation between the different groups within that larger population group, such as Jews, then there is no way to use DNA to pinpoint specific locations. This is the same reason why many DNA companies lump Germany and France together in their admixture, because the populations who lived in those areas moved around a lot and genetic variation between the French and Germans can sometimes be indistinguishable.

@PC-lu3zf 4 года назад

My mum was 100% Ashkenazic my dad was Sephardic and I bet we’d match somewhere hi Cousin LOL.

@PC-lu3zf 4 года назад

I’m 56% Ashkenazic according to ancestry.

@xxxthoughtlessxxx 4 года назад

63% Jewish here. Ancestry shows me personally every country of my ancestors: Latvia, Lithuania, Belarus and Russia being some. And ukraine I think....where specifically though, notnreally.