From Oxidative Damage To Actionable Lesion: Telomeric 8-Oxoguanine And Ogg1 Modulation In Aging And Disease
Our bodies are constantly exposed to “oxidative stress,” a process that can damage our cells and DNA, contributing to aging and chronic diseases. While we often hear about general antioxidants, pinpointing the exact damage and how to fix it has been a challenge. This research sheds light on a specific type of DNA damage called 8-oxoguanine (8-oxoG), which is particularly problematic when it occurs at telomeres. Telomeres are like protective caps on the ends of our chromosomes, and their health is crucial for cell function.
When 8-oxoG accumulates at these telomere caps, it can lead to their shortening, trigger alarms within the cell signaling DNA damage, and ultimately accelerate cellular aging, a process known as senescence. Our cells have a repair system, and a key player in fixing 8-oxoG is an enzyme called OGG1. Interestingly, this work suggests that not only the initial damage but also the intermediate products created during the repair process by OGG1 and another enzyme, MUTYH, can contribute to telomere dysfunction and cellular aging.
This understanding opens up new avenues for treatment. Instead of broad antioxidant approaches that have often fallen short, this research suggests that precisely controlling OGG1 activity—either by inhibiting or activating it—could offer a more targeted way to combat age-related diseases. The optimal strategy would depend on the specific state of the damage, moving us towards more personalized and effective interventions for healthy aging.
Source: link to paper