Modern dogs have ancestry from wolves in Asia and Europe, according to a study analysing DNA from 72 ancient wolves going back 100,000 years
29 June 2022
Modern dogs are closely related to two populations of ancient wolves, one from Asia and one from Europe, according to a study looking at ancient DNA.
Dogs are thought to be descended from Eurasian gray wolves (Canis lupus lupus), but the story of when and where they were domesticated is still shrouded in mystery.
Anders Bergstrom at the Francis Crick Institute in the UK and his colleagues analysed the DNA of 72 ancient wolves from ancient skeletal wolf remains that were found in Europe, Siberia and northwestern America, some of which were up to 100,000 years old.
The team sequenced the DNA of these ancient wolves and compared it to the genome of modern-day dogs. They hoped to find out whether any of these ancient wolves were more closely related to modern dogs than the others.
Finding an ancient wolf that is particularly related to a modern dog will give researchers a better idea of when exactly dogs evolved. “This is one of the biggest questions in human prehistory,” says Bergstrom.
The team did not find such a wolf in this study, but they did find that modern dogs were more genetically similar to ancient wolves in Asia than European ones.
Bergstrom says they cannot be more specific than that because they do not have enough ancient wolf samples. “There are still big parts of the map where we don’t have many samples,” Bergstrom says.
This is largely to do with the fact that DNA is preserved for longer in colder climates, he says. Most of the samples that the team studied came from the northern hemisphere and were found in permafrost and caves, which preserve genetic material well.
Bergstrom says the direct ancestor to modern dogs is probably somewhere in Asia. “It’ll be somewhere where we don’t have any samples yet,” he says.
The results also support previous research suggesting that modern dogs may have dual heritage. Early dogs in places like Israel and the African continent were found to be closely related to ancient European wolves, unlike dogs found in Siberia, the Americas and Europe.
This suggests wolves contributed DNA to the dogs that arrived in this region, says Bergstrom. This could mean dogs were independently domesticated in the east and the west and later merged, or they could have first been domesticated in Asia and then reproduced with wolves in the west.
All modern dogs seem to have this dual heritage now. The earliest dogs that were found to have this dual ancestry are 7000 years old and were found in Israel. But this ancestry from European wolves could have come in far earlier in the region and we just don’t have the samples to prove it, Bergstrom says. “Ideally we would have a dog from Israel that is 15,000 years old,” he says.
“Although previous studies have also posted the involvement of either western or eastern – or both – Eurasian wolves as the ancestors of modern dogs, this large study – though far from definitive – tips the balance again towards the east,” says Keith Dobney at the University of Sydney in Australia.
“Frustratingly we’re still no closer to identifying the actual – now almost certainly extinct – ancient wolf populations that are the direct ancestors of our pampered pooches. The hunt is still on for the smoking gun samples.”
Journal reference: NatureDOI: 10.1038/s41586-022-04824-9
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