The idea that Western Jews are half Levantine, half Northern Italian holds no water and makes no historical sense. I'd suggest you read this thread:
https://anthrogenica.com/showthread....tine-admixture
And some models for Western Jewish groups - no Northern Italian needed. Northern Italian improves the fit in
modern models due to them plotting closest to
ancient mainland Greek/Balkan sources, not because Western Jews have
modern Northern Italian ancestry:
Target: Romaniote_Jew
Distance: 0.8110% / 0.00810958
61.0 Levant_Beirut_IAIII
26.4 HRV_IA
7.0 Canary_Islands_Guanche
3.6 IRN_Hajji_Firuz_IA
1.2 DEU_MA_Baiuvaric
0.8 CHN_Chuanyun_Historic
Target: Tunisian_Jew
Distance: 0.8808% / 0.00880769
59.0 Levant_Beirut_IAIII
20.8 Canary_Islands_Guanche
16.2 HRV_IA
4.0 IRN_Hajji_Firuz_IA
Target: Sephardic_Jew
Distance: 1.2139% / 0.01213877
49.4 Levant_Beirut_IAIII
31.6 HRV_IA
11.0 Canary_Islands_Guanche
8.0 IRN_Hajji_Firuz_IA
Target: Ashkenazi_Poland
Distance: 0.7560% / 0.00756040
45.0 Levant_Beirut_IAIII
29.4 HRV_IA
8.8 DEU_MA_Baiuvaric
6.0 Canary_Islands_Guanche
5.0 IRN_Hajji_Firuz_IA
4.4 Baltic_LTU_Late_Antiquity_low_res
1.4 CHN_Chuanyun_Historic
Distance to: HRV_IA
0.02400696 Italian_Lombardy
0.02684022 Italian_Bergamo
0.03098048 Italian_Piedmont
0.03132283 Italian_Veneto
0.03232243 Italian_Trentino-Alto-Adige
0.03503135 Italian_Liguria
0.03523518 Swiss_Italian
0.03570296 French_Corsica
0.03623112 Italian_Tuscany
0.03842617 Greek_Thessaly
0.03893473 Italian_Northeast
0.04186317 Italian_Marche
0.04203788 Spanish_Mallorca
0.04216678 Spanish_Baleares
0.04240815 Spanish_Eivissa
0.04248741 Spanish_Menorca
0.04263746 French_Provence
0.04294519 Spanish_Terres_de_l'Ebre
0.04303196 Albanian
0.04368641 Italian_Umbria
0.04378507 Italian_Aosta_Valley
0.04442382 Greek_Macedonia
0.04596885 Spanish_Girona
0.04608396 Spanish_Peri-Barcelona
0.04665901 Spanish_Castilla_La_Mancha
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