This has interesting implications for the population of my ancestry, Arcadian Greeks. As you all know, I've posted my haplogroup result, I1b. My FamilyTreeDNA Y DNA matches are mostly with Poles, Romanians, Hungarians and Russians. The trace of East Asian DNA found in my autosomal DNA test might be explained by my belonging to one of these population types. AncestryByDNA, which offers the autosomal test, has an "Ethnicities" section which states that trace East Asian DNA among caucasoids is found in central- and eastern Europeans, who experienced invasions by Huns and Avars.
Arcadia, specifically the area around Tripoli, has ample evidence of Slavic settlement in toponymy, e.g. Stemnitsa and other toponyms with -itsi and -itsa, and in surnames and light pigmentation of its residents. None of these people are, however, neo-Danubian in appearance, that is, broad/round headed and flat-faced with light pigmentation. My father, who was Baltic-white, among one of the most light-pigmented people I've ever seen, was long-headed, as were many of his male siblings. What is certain is that Slavic toponymy was never present in ancient Greece. This all seems to add up to a Slavic influence among some Arcadians.
These people intermarried with an olive-skinned type that is common among us.
I revisited the Di Giacomo et al. study of Greeks and Italians and found that in continental Greece, haplogroup I-M170 is prevalent; this haplogroup has several subclades, some which may not be relevant here. I-M270 is the second most prevalent lineage in Greece, at 18.2%, behind the Neolithic DE. I-M170 is also numerically significant in Crete, where it occupies the third-most frequency of haplogroups. There are, however, other scenarios that could've brought this haplogroup to Arcadia--Albanians and "Vlachs". "Vlach" is a generic and derogatory term among some Greeks. There may be other explanations, such as historical events that eluded documentation. In my mind the least likely scenario is that I1b in me is the remnant of ancient Greeks, given the history of Arcadia, and I say this without a political agenda, of which I've been accused. If there wasn't evidence of Slavic culture in the area, I would be much more inclined to believe that my I1b is of ancient Greek origin. Furthermore, I am in no way arguing that Greeks on the whole are not biologically descended from their ancient cultural ancestors.