Longevity & AgingDNA Methylation Loss Forces Cancer Cells Into Permanent Senescence
Using precision protein-degradation tools (auxin-inducible degrons), researchers showed that cancer cells losing DNA methylation—without DNA damage—enter cellular senescence. By degrading UHRF1 and/or DNMT1 in colorectal cancer cells, the team triggered hallmark senescence features: G1 arrest, enlarged nuclei, SA-β-gal positivity, and a senescence-associated secretory phenotype (SASP). Critically, this senescence was independent of the classic p53 and Rb/p16 tumor suppressor pathways, instead involving cytoplasmic p21 (which blocked apoptosis) and nuclear cGAS acting independently of STING. The findings were validated across multiple cancer cell lines and confirmed in mouse xenograft models, suggesting DNA demethylation-induced senescence may represent a targetable vulnerability in tumors.
