Among other discoveries, Dr. Larson said that what he found was particularly interesting is that once dogs are domesticated, even if they sometimes breed with wolves, no new wolf DNA enters their genome.
In contrast, for example, pigs were brought to Europe by farmers in Anatolia. However, even if these pigs remain in domestic animals, the genes of these earliest domestic pigs have been completely lost and replaced by European wild boar genes.
Although dogs can crossbreed, no new wolf gene has survived for many years. Dr. Larson said that one possibility is that “gobbling” is simply not suitable for animals that approach dogs like people. Pigs may be a bit wild, but “If you are a dog with a little wolf in it, that is not a good thing. Those things will soon hit your head, or run away or disappear, but they won̵
Dr. Skoglund said that another interesting and unexplainable finding from the genomic data is how fast dogs are spreading across the globe and showing diversification. Therefore, by 11,000 years ago, there were not only Five different bloodlines, and some fossil DNA also shows that these bloodlines have begun to reorganize.
“How did that happen?” he said. “In ancient humans, we really don’t know what kind of human expansion would have contributed to this development, about 15 to 30,000 years ago.”
He said that in the past 11,000 years, the dog’s genome has shown similar evidence to the human genome of Anatolian farmers entering Europe. But starting about 4000 years ago, dogs suddenly lost their diversity.
Migration from the grasslands has also changed the human genome in Europe, but has little effect on the dog’s genome. On the contrary, the migration from the grasslands to the east left a mark on the history of the dog’s genome, but not for humans.