It explores one of the main issues we are observing with ancient DNA, the greater reduction in Y-DNA lineages relative to mtDNA lineages, and its most likely explanation (which I discussed recently).
Excerpts interesting for the Indo-European question (emphasis mine):
Gimbutas’s reconstruction has been criticized as fantastical by her critics, and any attempt to paint a vivid picture of what a human culture was like before the period of written texts needs to be viewed with caution. Nevertheless, ancient DNA data
In duelling 2015 Nature papers6,7, the teams arrived at broadly similar conclusions: an influx of herders from the grassland steppes of present-day Russia and Ukraine — linked to Yamnaya cultural artefacts and practices such as pit burial mounds — had replaced much of the gene pool of central and Western Europe around