Hibernating animals endure extreme physiological changes, surviving for months without food or water while lowering their metabolic rate and body temperature to near freezing. When they reawaken, they recover seamlessly from states comparable to severe human illnesses. This remarkable resilience, researchers say, may be rooted in shared genetic regions.
A key focus is the "fat mass and obesity (FTO) locus," a gene cluster known as the strongest genetic predictor of human obesity. In hibernators, this region appears to regulate fat accumulation and energy use differently. "What's striking about this region is that it is the strongest genetic risk factor for human obesity," said Chris Gregg, PhD, senior author and professor of neurobiology and human genetics at University of Utah Health. However, hibernators seem to repurpose these genes to survive winter dormancy.
The research team discovered hibernator-specific DNA elements near the FTO locus that function like regulatory switches. These noncoding regions do not encode proteins but influence the expression of hundreds of genes. Altering them in mice resulted in significant changes in metabolism, weight gain, and recovery after cold exposure. "When you knock out one of these elements - this one tiny, seemingly insignificant DNA region - the activity of hundreds of genes changes," said Susan Steinwand, the study's first author.
The study also revealed that the regulatory DNA controlling farmthese genes has evolved quickly in hibernators compared to other mammals. Using comparative genomics, scientists pinpointed regions that remained stable for over 100 million years but diverged rapidly in hibernating species - highlighting their likely role in metabolic adaptation.
Another strategy involved simulating fasting in mice to identify central "hub" genes responsible for metabolic shifts. These hubs overlapped with DNA regions that had changed in hibernators, pointing to a coordinated rewiring of genetic control.
Curiously, many hibernator-linked changes appear to "break" existing functions, potentially lifting genetic constraints that limit humans' metabolic flexibility. In essence, the human metabolic "thermostat" might be locked into a narrow operating range - while hibernators have freed themselves from these limitations.
Because hibernators can reverse muscle loss, resist neurodegeneration, and recover from extreme physiological shifts, unlocking similar control mechanisms in humans could lead to innovative treatments for aging and metabolic disorders. "If we could regulate our genes a bit more like hibernators, maybe we could overcome type 2 diabetes," said Elliott Ferris, co-author and bioinformatician at U of U Health.
"Humans already have the genetic framework," Steinwand added. "We just need to identify the control switches for these hibernator traits." Gregg concluded, "If that's hidden in the genome that we've already got, we could learn from hibernators to improve our own health."
Research Report:Conserved Noncoding Cis-Elements Associated with Hibernation Modulate Metabolic and Behavioral Adaptations in Mice
Research Report:Genomic Convergence in Hibernating Mammals Elucidates the Genetics of Metabolic Regulation in the Hypothalamus
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