Angela
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That is why I think the "Central Sicily" sample, if it was larger, would be more telling of pre-Moorish Sicilians, and I think the slight differences in the samples would become more pronounced. From what a Sicilian friend of mine says who is very well-versed on the history, and from 23andme results, the coastal area from Trapani along the south to Ragusa, has a stronger North African and Moorish influence (and Levantine), and Palermo and the north coast has more Norman.
Therefore, I think the inland areas would have less North African, less Northern European/Norman, and a higher West Asian/Caucasus prevalence related to the Neolithic.
I don't know what larger, more comprehensive studies would show...what I do know is that one sample from central Sicily, and one from southern Sicily, and four from, probably, Palermo, and none from eastern Sicily, as a whole don't constitute sufficient evidence, in my mind, from which to draw very reliable conclusions.
The fact that Sicily and southern Italy are so close autosomally would seem to me to argue against significant autosomal differences between the various Sicilian regions. Believe me, before the autosomal data came out showing the close relationship between Sicilians and southern Italians in general, I would have bet good money on the fact that Sicilians would be quite different autosomally from Southern Italians. The history seemed to indicate that would be the case. But it seems they are not, and merely form part of the general cline. In fact, the major difference I can see is in the SSA component, and even then there isn't as much of it in Sicily as I would have predicted.
As I have thought about this, and after reading the Chiarelli book, which I highly recommend, I have wondered if it is because the "Moors" who invaded Sicily included a very large number of Tunisian Berbers, a population which at the time may not have included very much SSA, and whose other components were not that dissimilar from those of other southern Europeans. Ydna, in particular, which is so volatile, and which may soar to almost saturation levels from founder effect may not be a good barometer for the general genetic make-up of a population.
The area to which I was referring, and which was somewhat sheltered from Moorish settlement, is a small, circumscribed one in the very north eastern part of the island, and the only possible such refugia in Sicily from the effects of the Moorish invasion. Central Sicily had a very different history.
Palermo Province, and the area slightly to it's west does show higher levels of I1, and U-106, and perhaps those are indeed a signal of "Norman" ancestry. But we are not speaking, or at least I didn't think we were speaking, of yDNA, but instead of autosomal DNA. The "Normans" probably numbered a few hundred men at the very most. How much change could they have effected on the autosomal make-up of the people of Palermo province or the whole northwest...if I remember correctly, the population of the city of Palermo alone was larger by orders of magnitude than any city in Europe and probably than many provinces. Take the example of India...one might be able to trace the yDNA of an Indian sample to an R1a1a lineage from southern Siberia, but autosomally that made only a difference of a few percent in that man's descendant.
As for Central Sicily, were it to be shown that it is significantly different from other parts of Sicily, my speculation would be that the cause was the founding of the so-called "Lombard" towns (actually northern Italian towns) in the central areas of Sicily where a lot of the Muslim Sicilians had gathered after the fall of the Sicilian Caliphate. That was, after all, the purpose of those towns: to pacify both the Muslim Sicilian and the Greek Orthodox Sicilian populations, and to implant and nurture Latin Catholicism. The Wiki article on the Lombard towns is actually not bad at explaining the history of that settlement.