In the 1950s, Russian researchers initiated an experiment to selectively breed silver foxes with the aim of domestication, creating foxes that exhibit dog-like traits such as affection and wagging tails. After nearly 70 years, scientists have identified a specific brain cell type linked to the behavioral changes in these foxes, particularly focusing on a receptor protein in the ventromedial hypothalamus, a brain area related to aggression and social behavior.
Cheryl Rosenfeld, a neuroscientist not involved in the study, highlighted that this research delves into the fundamental aspects of brain programming in animals. She speculated that similar hormonal or receptor changes in other species, including humans, might alter behavior patterns.
Eirene Markenscoff-Papadimitriou, the study’s senior author, joined the project in 2023, intrigued by the evolutionary aspects of the domesticated silver foxes, which began to exhibit physical and behavioral changes like floppy ears and an eagerness for human interaction after just a few generations of selective breeding.
The research team compared the brains of tame, aggressive, and wild foxes, focusing on the ventromedial hypothalamus, and found that tame foxes had significantly fewer estrogen receptor alpha neurons, a correlation that is critical to understanding aggression patterns. This finding has spurred interest in exploring whether similar neurons govern social behavior in dogs and wolves, raising questions about the genetic factors contributing to these behavioral differences.
