DNA Oxidation Drives Chromosome Instability at Centromeres, Study Finds

Scientists have discovered that oxidative DNA damage preferentially attacks centromeres, the specialized chromosome regions that ensure accurate cell division. This targeting creates fragility and chromosome instability, a hallmark of both aging and cancer. The research demonstrates a direct mechanistic link between oxidative stress—which increases with age—and one of the fundamental drivers of cellular dysfunction. Centromeres are essential for proper chromosome segregation during cell division; when they become unstable, cells can gain or lose chromosomes, leading to aneuploidy. This chromosome chaos is associated with cancer development, cellular senescence, and tissue aging. The finding is significant because it identifies a specific molecular pathway connecting oxidative damage to genomic instability, two key pillars of aging biology. It also suggests that interventions targeting oxidative stress, or specifically protecting centromeric regions, might help maintain chromosomal stability during aging. Understanding why centromeres are particularly vulnerable to oxidative damage could open new therapeutic avenues for preventing age-related genomic instability and its consequences.