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All of these programs are different. I'm not very familiar with Interpretome.
At 23andme the "Italian" score is on a cline. The scores in the far north that I've seen are in the 30's. I share with Lombards and Piemontesi who score around 45%. By the time you get to the Romagna, it's up to the mid-50s. The 100% Tuscans get in the high 60s and it goes up from there.
Part of that is because, like all these programs, the results are dependent on the reference samples. The 23andme reference panel is heavily weighted toward southern Italians and Sicilians, usually Italian Americans who have tested. There are a few northern Italians who have tested, but very few. In terms of academic samples, they only have the 8 people from the Bergamo sample. If a northern Italian doesn't match them or the southern Italians very well, 23andme is going to call those alleles "Southern European".
I'll give you an example, a Lombard:
Italian: 45
Broadly Southern European: 23
Iberian: 4
Balkan: 1
French: 4
British/Irish: 3
Broadly Northwestern European: 22
Broadly European: 7
If 23andme had enough representative samples, these "broad" categories would disappear, and, in my opinion, a lot of that "broadly Southern European" would become "Italian".
I don't think, btw, that this covers only movements within the last 500 years. I think it's more likely reaching back to perhaps as far as about 400 BC and the Gauls.
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