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The impact was very small from any invading group but I do suspect that the original Sicilians (i.e. pre-Greek, pre-Roman, pre-Moorish and pre-Roman) were actually darker and more West Asian than the people today, who have at least some input from European groups in the last thousand years. Prior to that, I'd debate whether or not they would be considered a genetically European population, possibly clustering with Cypriots.
Whereas a little Norman, some ancient Greek (mind you they had less West Asian than Greeks today), and then migration from the mainland Italy would be just enough to put them clustering where they do now. And you know this since the isolated areas of inland Sicily (Enna, Caltanissetta etc) come up more West Asian than people from the highly traveled coasts.
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