Research on canine molecular aging

Scientific research published in the journals Science and Cell Systems has identified a link between dog size and accelerated molecular aging. Using data from the Dog Aging Project, researchers from Arizona State University analyzed DNA methylation patterns to develop an epigenetic clock.

The study indicates that larger dog breeds experience a more rapid loss of DNA methylation, which normally regulates “jumping genes” or transposable elements known as LINE1s. When these markers are lost, these elements can move throughout the genome, potentially causing cellular damage and genomic instability. This process can cause a large dog’s biological age to exceed its chronological age.

Data suggests that for every year a dog’s biological age exceeds its actual age, the risk of death within the following two years increases by approximately 15 percent. Other factors influencing longevity include sex, facial structure, and body size. Researchers also noted that dogs age more rapidly during their first year than the traditional “seven-year rule” suggests.