Câinii de talie mare îmbătrânesc mai repede la nivel celular decât cei de talie mică (studiu)

A recent study reveals that larger dog breeds age molecularly faster than smaller breeds, contributing to their shorter lifespan. Researchers measured DNA methylation in 894 dogs, finding that large breeds show accelerated aging signs. This molecular aging is linked to genomic instability and higher cancer risks. Differences were also noted between male and female dogs, particularly on the X chromosome. The findings suggest that artificial selection for size may have unintended consequences on longevity. While the study does not negate previous theories about growth biology, it adds a molecular perspective to understanding canine aging.