A new genetic preprint on ancient Siberia just came out yesterday. It also contains a linguistical supplement by Peyrot and Kroonen. It samples two Pleistocene individuals from Yana river in Sakha republic, a ~7800BC individual from the Kolyma region, 14 Chukotkan individuals from the first millennium BC, six additional sixth millennium hunter-gatherers from Devil’s Gate Cave in Primorsky krai (other DGC individuals were sampled earlier) and ten later samples from all over Siberia.
Altai republic is home to several language varieties sometimes divided into two languages, Northern and Southern, and sometimes considered as dialects of a single official language which is based on the Oirot variety. While it is obvious that North and South Altai share many features, how closely related they are and what is their position within the Turkic family are less clear.
On one side there are Siberian Turkic languages, in particular Yeniseian languages, which Northern Altai shows some affinities to, on the other is the Kyrgyz language whose speakers likely arrived in Kyrgyzstan from the slopes of Tian Shan and Kipchak languages which may or may not include Kyrgyz and possibly even Altai itself.
Thus I’d like to investigate the differences between these languages and determine shared innovations which will hopefully illuminate relationships of descent among them.
While all Turkic languages show distinction between voiceless and voiced stops  word-internally, only Oghuz languages have it initially, and only between k/g in front vowel words and t/d .
Most reconstructions take this distinction to have been phonemic in Proto-Turkic, but Doerfer makes the case in Ein altosmanisches Lautgesetz im Kurdischen that we’re dealing with a secondary voicing in Oghuz.
Proto-Mongolic shows two peculiarities regarding coda consonants. First, unlike other (unaspirated) obstruents, *ǰ is not found in coda positions, and second, coda *r groups together with obstruents by synchronically aspirating a following obstruent of a suffix . It doesn’t take much imagination to try and combine these two.