All in Human origins

My milkshake brings all the genes to the yard

While it might not be as dramatic a superpower as being able to live four kilometres up a freezing mountain, the ability of many humans to drink milk in adulthood is certainly handy. As the story goes, the spread of this gene through populations in some parts of the world coincided with the rise in dairy farming. In turn, this enabled people to get more protein and fat in their diets, grow healthy and strong, and outcompete the non-milk drinking populations around them. But the latest research suggests that this neat evolutionary Just So story may not be true.

EPAS1: The mountain gene

Tibetans have lived in the thin mountain air for more than 6,000 years thanks to a gene variant they originally inherited from the ancient Denisovans. The thin air has favoured the persistence of one particular version of a gene called EPAS1, which allows these mountain-dwellers to get along just fine despite the shortage of oxygen. But it’s not only high-altitude humans who have traces of ancestral ‘ghosts’ in their DNA, it’s their pets too.

Svante Pääbo: searching for secrets in ancient DNA

Where did we come from? And how are we related to the ancient species that came before us? Swedish geneticist Svante Pääbo is helping us find out - and, as has recently been announced, his work has led to him winning the 2022 Nobel prize in physiology or medicine “for his discoveries concerning the genomes of extinct hominins and human evolution”. So what did he discover?