Autonomous DNA Origami Nanorobots: Computing Boolean Logic Inside Living Cells

Structural DNA nanotechnology has evolved from geometric curiosities into functional, autonomous molecular machines. By folding long single-stranded viral DNA scaffolds (such as M13mp18) using hundreds of short synthetic oligonucleotide "staple" strands, researchers construct hollow nano-barrels equipped with molecular logic gates.

1. Aptamer-Based Boolean Logic Gates

DNA nanorobots are kept securely closed by duplex DNA latches functionalized with nucleolin-targeting aptamers. To prevent accidental opening in healthy vascular tissue, the latch mechanism operates as an AND logic gate. The nanorobot requires simultaneous binding of two distinct cell-surface markers (e.g., nucleolin and epidermal growth factor receptor) before strand displacement reactions unzip the barrel fasteners.

2. Intravascular Thrombosis Induction

Inside the barrel cavity, the DNA nanorobot carries human blood coagulation protease thrombin. When the logic gates open specifically upon docking with tumor-associated endothelial cells, the exposed thrombin catalyzes local fibrinogen-to-fibrin conversion. This creates localized intravascular thrombosis within the tumor vasculature, cutting off oxygen and nutrient supply and inducing targeted ischemic necrosis while systemic clotting factors remain unaffected.