ATGL-Catalyzed Lipid Catabolism Promotes DNA Repair
Our bodies are constantly exposed to factors that can damage our DNA, leading to genomic instability, which is a major contributor to aging and various age-related diseases. While we know a lot about how DNA gets repaired, the connection between our metabolism and this vital process has been less clear. Recent research sheds light on this by identifying a surprising link: a fat-breaking enzyme called adipose triglyceride lipase (ATGL) is a key player in DNA repair.
The study found that when DNA is damaged, cells accumulate tiny fat storage units called lipid droplets. Interestingly, boosting the activity of ATGL, which breaks down these fats (a process known as lipolysis), significantly improves the cell’s ability to fix its DNA after harmful exposures like radiation. This enhanced repair then reduces the long-term negative consequences of DNA damage, such as cells entering a state of permanent growth arrest called senescence, and ultimately helps cells survive better.
Mechanistically, ATGL promotes a chemical modification called acetylation on proteins associated with our genetic material (chromatin-bound proteins). This acetylation is crucial for facilitating the DNA repair process. These findings reveal a novel way in which fat metabolism contributes to maintaining the integrity of our genetic code, opening new avenues for understanding and potentially combating age-related decline and diseases.
Source: link to paper