Arizona State University researchers link large dog aging to jumping genes

Researchers from Arizona State University have identified a genomic mechanism that explains why large dog breeds age faster than smaller ones. According to a study published in the journal Science, the accelerated molecular aging in larger and male dogs is linked to a loss of epigenetic control over “jumping genes,” specifically known as LINE1 elements.

By analyzing DNA methylation profiles from nearly 900 dogs enrolled in the Dog Aging Project, scientists constructed an epigenetic clock capable of predicting a dog’s biological age. The study found that larger breeds lose approximately 35% more methylation in regions associated with LINE1 per year compared to smaller breeds. This loss of regulation allows these transposable elements to increase activity, contributing to genomic instability.

The research indicates that for every year a dog’s epigenetic age exceeds its chronological age, the risk of death increases by 15%. Lead researcher Noah Snyder-Mackler noted that because companion dogs receive consistent care, these findings regarding cellular aging may eventually be extrapolated to human health research.