I just saw something about this last week when I was curiosity browsing:

http://rbth.com/science_and_tech/2016/02/23/its-official-nat...

According to this research, not only did they find a Siberian link to NAs, but they found a link between Australian indigenous people among some NAs.

Wikipedia says:

    Two 2015 autosomal DNA genetic studies confirmed the
    Siberian origins of the Natives of the Americas. 
    However an ancient signal of shared ancestry with the 
    Natives of Australia and Melanesia was detected among 
    the Natives of the Amazon region.

https://en.wikipedia.org/wiki/Genetic_history_of_indigenous_...