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This study demonstrates programmable ultrasensitive threshold responses in DNA origami rings via chemomechanical instability. DNA origami rings were exposed to DNA intercalators (EtBr, DOX, YOYO-1), inducing torsional stress that triggers Michell’s instability. Atomic force microscopy (AFM) visualized ring conformations at varying intercalator concentrations, confirming sharp structural transitions at critical thresholds. This AFM-derived structural data was essential to correlate molecular-level reconfiguration with predicted mechanical models, validating programmable responsiveness in synthetic biomolecular systems.