How Farming Reshaped Human Genomes
by Michael Balter
Before farming began to spread across Europe some 8500 years ago, the continent’s occupants were hunter-gatherers. They were unable to digest starch and milk, according to a new ancient DNA study of a nearly 8000-year-old human skeleton from Spain.
But these original occupants did already possess immune defenses against some of the diseases that would later become the scourge of civilization, and they apparently had dark skin. The findings are helping researchers understand what genetic and biological changes humans went through as they made the transition from hunting and gathering to farming.
The rise of farming about 10,000 years ago was one of the most dramatic events in human history. Europe’s farmers came originally from the Middle East and migrated west via Greece and Bulgaria. For decades, the only way scientists could study these events was by extrapolating back from the genetics of modern-day Europeans, a rough guide at best to what had happened in the past.
But over the past several years, ever more sophisticated techniques for extracting and sequencing DNA from ancient skeletons have opened the window on to the genetics of ancient hunter-gatherers and farmers alike, allowing researchers to not only trace their movements and interactions but also how the rise of farming changed their biology…
(read more: Science News/AAAS)
images: J.M. Vidal Encina; (illustration, inset) CSIC