Theory : coastal north africans don't have any SSA ancestry

[Hamilcar]

or it's very low. But how ?

when it comes to the west african ancestry it's due to shared alleles that goes back to the time when iberomaurusians spread their genes southward :

Moreover, our model predicts that West Africans (represented by Yoruba) had 12.5±1.1% ancestry from a Taforalt-related group rather than Taforalt having ancestry from an unknown Sub-Saharan African source11; this may have mediated the limited Neanderthal admixture present in West Africans23. An advantage of our model is that it allows for a local North African component in the ancestry of Taforalt, rather than deriving them exclusively from Levantine and Sub-Saharan sources.

https://www.biorxiv.org/content/10.1101/423079v1.full

strangely this "12.5±1.1%" is very similar to the amount of SSA coastal NAs score on gedmatch.


As for the east african component it's also due to shared alleles (same source of ancestry) :

A single prehistoric migration of both the Maghrebi and the Ethio-Somali back into Africa is the most parsimonious hypothesis. That is, a common ancestral population migrated into northeast Africa through the Sinai and then split into two, with one branch continuing west across North Africa and the other heading south into the HOA

https://journals.plos.org/plosgeneti...l.pgen.1004393

Also the capsian culture (originally from the Near East) that is found in both the maghreb and North-east africa (eburran culture). It can't be a coincidence :

https://en.wikipedia.org/wiki/Capsian_culture



What do you think ?

[Leto]

I don't know. Nassbean, can you provide unmixed Moroccan and Algerian Berber kits/results for our Dodecad K12b spreadsheet? There is no way I can find them myself and the original references are horribly inaccurate. At least 10 unmixed samples for either country would suffice.

[Hamilcar]

I don't know. Nassbean, can you provide unmixed Moroccan and Algerian Berber kits/results for our Dodecad K12b spreadsheet? There is no way I can find them myself and the original references are horribly inaccurate. At least 10 unmixed samples for either country would suffice.

https://imgur.com/CuMkZ5Z
https://imgur.com/CICtUGV
https://imgur.com/7QkbiaB
https://imgur.com/k9i9CBL
https://imgur.com/XkErFI7
https://imgur.com/VdKxiAY
https://imgur.com/AYFWLJq
https://imgur.com/63OyiXa
https://imgur.com/CguqyIZ


That's all I found

[Leto]

https://imgur.com/CuMkZ5Z
https://imgur.com/CICtUGV
https://imgur.com/7QkbiaB
https://imgur.com/k9i9CBL
https://imgur.com/XkErFI7
https://imgur.com/VdKxiAY
https://imgur.com/AYFWLJq
https://imgur.com/63OyiXa
https://imgur.com/CguqyIZ


That's all I found

Are they all Moroccan or Algerian? Maybe creating a "Mixed_Berber" reference would not be a bad idea?

[Hamilcar]

Are they all Moroccan or Algerian? Maybe creating a "Mixed_Berber" reference would not be a bad idea?

yes some tunisians too

[Leto]

yes some tunisians too

Well, picking random kits with Maghrebi-sounding names wasn't my idea, to be honest. Thanks for the contribution but I'm not sure random people from three different countries belong together in one reference pop.

[Hamilcar]

Well, picking random kits with Maghrebi-sounding names wasn't my idea, to be honest. Thanks for the contribution but I'm not sure random people from three different countries belong together in one reference pop.

well if you look closely they don't diverge that much from each other and that's all I could found for dodecad k12b (I can classify them based on their country and delete the ones who have higher ssa but we'll end up with even less samples)

[Leto]

well if you look closely they don't diverge that much from each other and that's all I could found for dodecad k12b (I can classify them based on their country and delete the ones who have higher ssa but we'll end up with even less samples)

SSA is not the only thing. Some score elevated Gedrosia and North European which may indicate additional European ancestry. I don't want to add such individuals, that would be an average for nobody. Tunisians are said to have more European ancestry, so I would exclude them altogether.

[Hamilcar]

SSA is not the only thing. Some score elevated Gedrosia and North European which may indicate additional European ancestry. I don't want to add such individuals, that would be an average for nobody. Tunisians are said to have more European ancestry, so I would exclude them altogether.

What you're saying here doesn't make sense. You can't be a pure berber and at the same time be representative for your country (the purest berbers I've seen came from the souss region in Morocco and Chenini in Tunisia but they are both small groups).

The people I posted are totally representative and "average" for their respective countries and no overall tunisians don't have more Euro ancestry except some outliers

[Thunder_shock]

Well the African component in taforalt/iberomaurisian pulls them a lot closer to other ssa (taforalt 40% indigenous north african and plots like a mullato), so it's reasonable to assume that this african component is highly related to a sub saharan african population.