{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSIRT6 is emerging as a central guardian of genome stability through its chromatin‐modifying activities. It deacetylates histone H3 lysine residues—for example, H3K9 at telomeres and H3K18 at pericentric heterochromatin—to sustain a specialized chromatin state that preserves telomere integrity and suppresses premature cellular senescence. In response to DNA damage and oxidative stress, SIRT6 is rapidly recruited to double‐strand breaks where it cooperates with repair factors such as PARP1 and DNA-PK, a process further fine-tuned by stress‐activated signaling (via JNK-mediated phosphorylation) and enhanced by lamin A."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in genome maintenance, SIRT6 functions as a key metabolic and inflammatory regulator. It modulates non‐deacetylase activities by removing long-chain fatty acyl groups—for instance, on TNF-α—thereby influencing protein secretion and cellular signaling. It has been implicated as a tumor suppressor by repressing aerobic glycolysis in cancer cells and is uniquely activated by free fatty acids, which markedly enhance its catalytic efficiency. In addition, SIRT6 governs circadian gene expression by controlling the chromatin binding of CLOCK:BMAL1 and SREBP-1, contributes to the regulation of gluconeogenesis via deacetylation of FoxO1, and is dynamically upregulated during nutrient deprivation. These metabolic functions extend to diverse tissues, impacting cardiovascular homeostasis, antioxidant responses through NRF2 coactivation, adipose function, and even the pathogenesis of non-alcoholic fatty liver disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSIRT6 also exerts profound influences on cell fate decisions, senescence, and tumorigenesis in a tissue-specific manner. In the lung and kidney, for example, SIRT6 attenuates epithelial and podocyte senescence—via modulation of pathways such as Notch—to protect against fibrosis and injury. 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