Quite consistent with my idea that Proto-Indo-European is related to the West_Asian autosomal component. This component occurs at a a level greater than 50% level in modern North Caucasian speakers, is absent in Europe prior to 5,000 years ago, and occurs at levels greater or equal to 10% in most present-day Indo-European speakers from Europe.
Transactions of the Philological Society DOI: 10.1111/j.1467-968X.2012.01309.x
Areal Typology of Proto-Indo-European: The Case for Caucasian Connections
This paper re-examines the evidence for early contacts between Proto-Indo-European (PIE) and the languages of the Caucasus. Although we were not able to find certain proofs of lexical borrowing between PIE and North Caucasian, there are a few undeniable areal-typological parallels in phonology and grammar. Some features generally attributed to PIE are not found in the majority of languages of North and Northeastern Eurasia, while they are common, or universally present, in the languages of the Caucasus (especially North Caucasus). Those features include the high consonant-to-vowel ratio, tonal accent, number suppletion in personal pronouns, the presence of gender and the morphological optative and, possibly, the presence of glottalized consonants and ergativity.