A recent study has analyzed DNA from over 4,000 dogs, identifying 10 significant genetic lineages linked to specific tasks associated with various breeds. Common gene sets are responsible for behavioral traits in breeds known for herding, hunting, and other functions. This research also connects these findings to human behavior, with some genes related to sheep dogs being associated with ADHD in people.
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The study, published on December 8, 2022, in the journal Cell, involved examining DNA samples from more than 200 dog breeds along with a survey of 46,000 pet owners. Researchers aimed to better understand the genetic factors behind distinct canine behaviors. Senior study author Elaine Ostrander from the National Human Genome Research Institute (NHGRI) emphasized the extensive role humans have played in breeding dogs for specific tasks, stating that the creation of 350 distinct breeds represents one of the largest genetic experiments undertaken by humans.
The research team collected whole-genome data, including from purebred, mixed-breed, and semi-feral dogs, alongside wild canids. They discovered distinct genetic lineages among the breeds, each linked to certain behaviors based on their breeding tasks. For instance, terriers, known for their prey drive, exhibited genetic traits aligned with their historical roles in hunting.
By performing a genome-wide association study, the team identified particular genes linked to behaviors typical of livestock-herding dogs. Notably, genes involved in axon guidance—critical for brain circuitry development—were found to be prevalent in these breeds. The study concluded that the way different brain regions communicate could significantly influence dog behavior.
In addition, the researchers noted that the genetic variants associated with sheep dogs were closely related to genes contributing to behaviors in other species, including humans. This suggests that similar genetic factors affect behaviors in both dogs and people, providing insights into the high energy levels and task-focused nature of sheep dogs.
Dutrow, the study's first author, highlighted the parallels between human cognitive diversity and behavioral variations among dog lineages, indicating that the genetic mechanisms at work may be similar in both species. Ostrander remarked on the study's achievement in shedding light on the genetic foundations of canine behavior after years of research in the field.
For further guidance on dog training and behavior, the American Kennel Club provides resources.
SOURCE: Cell, news release, December 8, 2022.