New research suggests that an overactive immune sensor may play a major role in severe genetic disorders linked to rapid aging. By reducing the activity of this sensor, scientists were able to improve tissue health across several biological systems, challenging long-held ideas about how DNA damage drives degeneration. The immune system is designed to recognize and eliminate threats such as viruses.
But under certain conditions, that protective machinery can mistakenly react to the body's own damaged DNA. When fragments of DNA are treated as if they came from an invading virus, the resulting immune response can trigger chronic inflammation that harms healthy tissue. An international research team led by Dr.
Itamar Harel at Hebrew University, working with Prof. Ido Ben-Ami (Hebrew University and Sha'are Zedek Medical Center), and Prof. Bérénice Benayoun (University of Southern California), found that this misplaced immune reaction is a major contributor to tissue degeneration in severe, rapid-aging disorders.
When the researchers reduced this immune false alarm, they saw improvements across multiple biological systems. The study focused on rare DNA damage-repair (DDR) syndromes such as Ataxia-Telangiectasia (A-T) and Bloom syndrome. In these disorders, the cellular systems responsible for repairing routine DNA damage do not work properly.
As a result, damaged DNA can accumulate throughout the body, creating genomic instability and contributing to neurodegeneration, increased cancer risk, and premature aging. For decades, researchers largely assumed that the unrepaired DNA itself was the main force driving cellular decline. The new findings suggest the picture is more complicated.
"Our results show that the damage isn't acting alone," said Prof. "It's the body's response to that damage, an exaggerated, chronic inflammatory reaction, that drives much of the degeneration." When Damaged DNA Triggers an Immune False Alarm When DNA repair breaks down, pieces of DNA can escape into the cell's cytosol. Once there, they can activate a molecular sensor called cGAS.
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