DNA Repair Defects Trigger Premature Aging Through Immune System Activation

This groundbreaking study reveals how defective DNA repair directly triggers premature aging through immune system activation, offering new therapeutic targets for age-related diseases. DNA-protein cross-links are toxic cellular lesions that normally get repaired by the SPRTN enzyme, but when this system fails, the consequences extend far beyond simple DNA damage.

Researchers studied mice with defective SPRTN function, modeling Ruijs-Aalfs progeria syndrome, a rare aging disorder. They tracked how unrepaired DNA damage affects cellular and organismal health through detailed molecular analysis and phenotypic observation.

The key discovery centers on the cGAS-STING pathway, an immune sensing system that detects foreign DNA. When SPRTN fails, damaged DNA accumulates and leaks into the cell's cytoplasm, where cGAS-STING mistakenly identifies it as a threat. This triggers chronic inflammation and interferon responses that drive aging processes. In the mouse model, this immune activation caused embryonic lethality and accelerated aging symptoms.

Most importantly, the researchers demonstrated that blocking cGAS-STING signaling either genetically or pharmacologically rescued the mice from embryonic death and prevented aging phenotypes. This suggests that targeting this immune pathway could treat not just rare progeria syndromes, but potentially common age-related diseases driven by DNA damage accumulation.

The findings connect DNA repair deficiency, innate immunity, and aging in a previously unknown pathway, highlighting how cellular damage can systemically accelerate aging through immune activation rather than just local cellular dysfunction.