Aberdeen
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I refreshed my recollection of the papers from the Estonian Institute and the isolates are in northeastern Italy and Val Borbera in basso Piemonte.
FWI, the creator of the MDLP calculator obviously has access to the raw date from the Estonian Institute papers. That's why so many northern Italians are now getting Piemonte as one of their matches on that run.
The samples from this institute are not, in my opinion, the best choice for autosomal analysis. Their sampling locations are always these very unrepresentative genetic isolates, chosen perhaps because they're studying recessive or otherwise genetic dieseases. In the case of the Val Borbera, in particular, I don't think it's very representative of general northwestern Italian populations. It has a very unique history. The same holds true for their Apulia sample.
I do understand the need for population geneticists not to sample in large cities where there has been a lot of mixing from disparate areas over the centuries. In such cases, a middle ground is, I think, to take a Boattini approach if the concern is not to mix southerners with northerners or Venetians with the Piemontese; use surnames. That's what Cavalli Sforza did for a lot of his studies.
I'm curious about the surname thing, because in English speaking countries it's very common for people from various ethnic groups to change their name in order to seem more part of the mainstream. Does that not happen in Italy?