European languages linked to migration from the east

@article{Callaway2015EuropeanLL,
  title={European languages linked to migration from the east},
  author={Ewen Callaway},
  journal={Nature},
  year={2015}
}
Large ancient-DNA study uncovers population that moved westwards 4,500 years ago. 

References

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Massive migration from the steppe is a source for Indo-European languages in Europe
We generated genome-wide data from 69 Europeans who lived between 8,000-3,000 years ago by enriching ancient DNA libraries for a target set of almost four hundred thousand polymorphisms. EnrichmentExpand
Ancient human genomes suggest three ancestral populations for present-day Europeans
TLDR
It is shown that most present-day Europeans derive from at least three highly differentiated populations: west European hunter-gatherers, who contributed ancestry to all Europeans but not to Near Easterners; ancient north Eurasians related to Upper Palaeolithic Siberians; and early European farmers, who were mainly of Near Eastern origin but also harboured west Europeanhunter-gatherer related ancestry. Expand