Trinity College Dublin scientists sequence 9,500-year-old sledge dog's complete genome

Scientists sequence oldest complete dog genome – 9,500-year-old Zhokov the Siberian sledge dog

Sledge dogs are much older and adapted to Arctic conditions much earlier than previously thought, according to a new ancient genomics study published today in leading international journal Science [Thursday 25th June 2020].

In a new study from the QIMMEQ project, a team of researchers from the University of Copenhagen, University of Greenland, the Institute of Evolutionary Biology – Barcelona and Trinity College Dublin show that ancestors of modern sledge dogs have worked and lived with humans for over 9,500 years.

Dogs play an important role in human life all over the world – whether as family members or as working animals. But where the dog comes from and how old various groups of dogs are is still a bit of a mystery. Now, light has been shed on the origin of the sledge dog.

First author of the study, Mikkel Sinding, from the Globe Institute and a Postdoctoral Fellow in Trinity’s School of Genetics and Microbiology, said:

“We have extracted DNA from a 9,500-year-old dog from the Siberian island of Zhokhov, which the dog is named after. Based on that DNA we have sequenced the oldest complete dog genome to date, and the results show an extremely early diversification of dogs into types as sledge dogs.”

Until now, it has been the common belief that the 9,500-year-old Siberian dog, Zhokhov, was a kind of ancient dog – one of the earliest domesticated dogs and a version of the common origin of all dogs. But according to the new study, modern sledge dogs such as the Siberian Husky, the Alaskan Malamute and the Greenland sledge dog share the major part of their genome with Zhokhov.

“This means that modern sledge dogs and Zhokhov had the same common origin in Siberia more than 9,500 years ago. Until now, we have thought that sledge dogs were only 2-3,000 years old,” added Mikkel Sinding.

The original sledge dog

To learn more about the origins of the sledge dog, researchers further sequenced genomes of a 33,000-year-old Siberian wolf and ten modern Greenlandic sledge dogs. They compared these genomes to genomes of dogs and wolves from around the world.

“We can see that the modern sledge dogs have most of their genomes in common with Zhokhov. So, they are more closely related to this ancient dog than to other dogs and wolves. But not just that – we can see traces of crossbreeding with wolves such as the 33,000-year-old Siberian wolf – but not with modern wolves. It further emphasises that the origin of the modern sledge dog goes back much further than we had thought,” said Mikkel Sinding.

The modern sledge dogs have more genetic overlap with other modern dog breeds than Zhokhov has, but the studies do not show where or when this occurred.

Nevertheless, among modern sledge dogs, the Greenland sledge dog stands out and has the least overlap with other dogs, meaning that the Greenland sledge dog is probably the most original sledge dog in the world.

Common features with Inuit and polar bears

In addition to advancing the common understanding of the origin of sledge dogs, the new study also teaches more about the differences between sledge dogs and other dogs.

Sledge dogs do not have the same genetic adaptations to a sugar and starch rich diet that other dogs have. Instead, they have adaptations to high-fat diets, with mechanisms that are similar to those described for polar bears and Arctic people.

Mikkel Sinding said:

“This emphasises that sledge dogs and Arctic people have worked and adapted together for more than 9,500 years. We can also see that they have adaptations that are probably linked to improved oxygen uptake, which makes sense in relation to sledding and give the sledding tradition ancient roots.”