DNA data offer evidence of unknown extinct human relative

[csziggy]

1. This is interesting but I'm wondering about the Denosovan DNA

My sister got her DNA tested through the National Geographic program and showed 2.8 % Neanderthal, and some Denisovan DNA (I can't find my copy of her results right now to check the exact amount). She also showed a little bit of American Indian DNA which is strange since we don't have any genealogical indication of that in our background.

My DNA results from Ancestry did not show any American Indian traces - the only non-Northern European bits at all were very faint traces from Mediterranean areas and India. Again, our genealogy shows neither of those in the background.

According to this article:

Bohlender and colleagues calculate that Europeans and Chinese people carry a similar amount of Neandertal ancestry: about 2.8 percent. Europeans have no hint of Denisovan ancestry, and people in China have a tiny amount — 0.1 percent, according to Bohlender’s calculations. But 2.74 percent of the DNA in people in Papua New Guinea comes from Neandertals. And Bohlender estimates the amount of Denisovan DNA in Melanesians is about 1.11 percent, not the 3 to 6 percent estimated by other researchers.

So where did my sister get Denisovan DNA? Or perhaps the interpretation by the National Geographic DNA study was incorrect a couple of years ago when she got her results?