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The ancient dog DNA showed early global spread



Among other findings, Dr. Larson said he found it particularly interesting that once dogs were domesticated, and even when they were breeding with wolves, no new wolf DNA had entered the genome. of them.

In contrast, pigs, for example, were brought to Europe by farmers from Anatolia. But the genes of those first domesticated pigs were completely lost, replaced by the genes of the European wild boar, even though these pigs are still domesticated animals.

Although dogs are crossbreeds, no new wolf gene has existed over the years. One possibility, Dr. Larson said, is that “wolfness”

; doesn’t suit an animal that’s as close to humans as dogs. Pigs can be a bit wild but “if you’re a dog and you have a little wolf in you, that’s not a good thing and those things will be hit in the head very quickly or run away or disappear but they don’t. ‘must not be integrated into the dog population.’

Dr. Skoglund said another intriguing and inexplicable finding from genomic data is how fast can dogs spread across the globe and diversification, to the point that 11,000 years ago, not just there are 5 distinct lineages, some of the fossil DNA also shows that those lineages began to recombine.

“How did that happen?” he say. “In ancient humans, we didn’t really know of any human expansion that would have facilitated this, in the order of 15 to 30,000 years ago.”

Over the past 11,000 years, he said, the dog genome shows evidence similar to that of the Anatolian farmers who moved to Europe. But then, a sudden loss of diversity in dogs began about 4,000 years ago.

Additionally, steppe migrations have altered the human genome in Europe, but have barely affected the dog’s genome. In contrast, migrations from the steppe to the east left a mark in the history of the dog’s genome, but not in humans.


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