If you don't mind my asking, how did you get access to the registry records? In my experience they're never digitized or on line. It would be very good for Italians of the diaspora if they've starting to do that.
Using the parish records can take you very far back indeed, all the way to the time of the Council of Trent or, in some places, even further. However, it can jump from parish to parish, as I'm sure you know, since marriages are usually registered in the church of the bride. None of it is computerized, to my knowledge, so I'm afraid tracing your family tree back in time won't be able to be done with a letter to the parish priest of one parish. If you really want it done, you'll have to spend your vacations in Italy doing it.
Still, I don't think that this would answer your ultimate question since you're interested in very ancient origins. As some members have already told you, without much more ancient dna, very refined by sub-clade, there are lots of possibilities.
Just parenthetically, yes, port cities have always been more cosmopolitan. However, eastern Liguria, which has always been a trading center, has very little J1. The same applies to Venezia, the biggest port on the Adriatic. On the other hand, you have a bit in the mountains of Piemonte, and inland places in the Balkans and even up toward central Europe. Or, look at E-V13. There's a lot, relatively speaking, in the Tirol and southern Germany. Y dna is very subject to founder effect and drift. Sometimes, one line just gets lucky.
Or, look at the recent results from the ancient dna from Britain, discussed on a thread on this Board.
http://www.eupedia.com/forum/thread...Gladiator-and-Anglo-Saxon?p=474629#post474629
We have a yDna J2 all the way in York who "fits" somewhere south of modern Palestinians and Jordanians and north of Saudis autosomally. (West African SSA and perhaps some SA seems to have changed the picture in the Middle East since his time) Yet I'm sure that J2 British men, if some can be found who match him, will be indistinguishable from other Brits.
I know some men are very attached indeed to their yDna, but it's only one among many ancestors. We have a J2 mesolithic Karelian, a J2 from the mid-to-late Neolithic, J2's from the Bronze Age and on and on, and they are, or will be found to be, different autosomally.
We clearly have more J2 and J1 in Italy (in all of Southern Europe, actually). Without detailed sub-clade information from ancient dna, however, we can't know to which migration to assign it and how much autosomal impact each wave might have had. After all, both Neolithic and post Neolithic migrants from the southeast or Anatolia would have carried Ancient Anatolian farmer dna, and at some point CHG ancestry. It's going to be tricky.
They're going to have to compare samples both pre-and-post every major wave of migration. That's going to be difficult in some eras because some cultures in Italy practiced cremation. Then, people buried in elite burials might have been very different from the commoners.
Even getting a good sample is going to be difficult. The bones in museums have been handled so often, for so many centuries, that they're very contaminated. Also, not many of them are complete skulls, and from the information provided by the authors of the British study, the results are most accurate if taken from the petrous bone behind the ear, or lacking that, the teeth. It's no coincidence that much of this very good dna we're seeing tested is from "fresh" finds.
Assigning "native" versus "foreign" status is also going to be difficult in an era like the Roman one, for example, since both occupied various positions on the social scale, and it seems that the original "Anatolian farmer" and MN people may have survived much better in southern Europe.
Some abstracts indicate there's going to be a lot of results being announced relatively soon. I'm personally very impatient to get results, particularly from any Etruscan or Roman remains. I owe it to my father to try to prove we're related to them!
I just hope the authors used the latest tools, like the ones used by the Schiffels team. Unfortunately, I think the Reich lab is busy with other things.