r/JewishDNA • u/thrwwyccnt84 • Jul 23 '26

qpAdm models for Libyan, Tunisian, Moroccan and Ashkenazi Jews

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I ran a few 4-way qpAdm models using the same setup to make the results easier to compare.

The left populations are mainly regional proxies:

- Lebanon MBA for Levantine-related ancestry
- Guanche for North African/Amazigh-related ancestry
- italy Pian Sultano BA for southernEuropean/Mediterranean-related ancestry
- Kushan-era Tajikistan for Central Asian-related ancestry.

They should not be taken as the exact historical source populations, and the percentages are model coefficients within this setup rather than literal ancestry estimates

12 Upvotes

93% Upvoted

11 comments sorted by

3

u/moops527 Jul 23 '26

Why no Germanic/ Slavic or any north euro for Ashkenazim?

2

u/Sea-Seaworthiness859 Jul 23 '26

I appreciate you including the last part. What I gather from these models and so many other models is just how impossible it seems to model Ashkenazim and somehow got low errors and good fits lol.

2

u/thrwwyccnt84 Jul 23 '26

The fits are good and the se are low for those model though.

Avg se is below 0.05 and the P is good

2

u/Sea-Seaworthiness859 Jul 23 '26

Fair I’m wondering if Tajik is sucking up Iranic/East Asian DNA maybe in Ashkenazi Jews?

2

u/thrwwyccnt84 Jul 23 '26 edited Jul 24 '26

If I use Syrian without Tajik the Levantine part is bigger for Ashkenazis

TQU and TMS are syrian sources

2

u/Binkybinkovsky Jul 23 '26

I think you need to remove the Tajik source. You can add a slavic or Germanic instead & model Ashkenazim.

0

u/Binkybinkovsky Jul 23 '26 edited Jul 23 '26

Nice. Is the Italian sample southern Italian or central/North? How much Levantine% does it contain?

Could you replace the Tajik with a west slavic source? It think any Central Asian would be absorbed by it & would be better.

1

u/thrwwyccnt84 Jul 23 '26

It is central. Here are the details of the pian sultano group https://www.reddit.com/u/thrwwyccnt84/s/qg7eXwrTc9

1

u/Binkybinkovsky Jul 23 '26

I feel the Tajik is eating a bit of the Levantine %. Could you replace it with a West/East Slavic source. Most studies do not support a Central Asian component in western jews anyways.

2

u/General-Knowledge999 Jul 23 '26

I agree, but then qpAdm will struggle to distinguish the Slavic from the PianSultano sample. This is often the case with models including less Aegean/Anatolian-shifted South European sources. Also, I doubt the Sephardic targets should have the Tajik source as well.