I've read years ago that 8% of all Asian men and thus 0.5% of all men would be descendant of Genghis Khan.
Is there any truth to this? Or was this some trick to get their paper published?
Link to the original paper (pdf)
I love it when questions contain the research for their own answer.
The paper describes a particular set of genes:
It analyses it current populations statistically, using a couple of approaches to conclude:
It considers, and shows evidence to refute, a number of possible causes of this, e.g.
It searched for confirmatory evidence by looking at a population that are (putatively) direct male line descendents of Khan.
Looking through Google Scholar, I can see no examples of refutation, but many others citing their results positively (e.g.). The paper was published in a reputable peer-reviewed journal, and contains a number of authors from prestigious institutions that are working within their areas of expertise, so the idea that it might be exaggerated for publication is unlikely.
It appears to have a robust result, that it seems reasonably to provisionally accept unless counter evidence is produced.