DNA-based computer runs 100-bit arithmetic via self-assembling molecular grid

Researchers at Maynooth University have built a scaffolded DNA computer that performs calculations without electrical power, using self-assembling strands to process information. The system, described in Nature, executed 10 molecular programs including complex 100-bit operations. It could enable energy-efficient computing, long-term data storage, and future molecular sensors for disease detection.

The Scaffolded DNA Computer relies on DNA origami, a method where a long viral strand is folded by hundreds of short staple strands into a precise grid. Assembly occurs spontaneously in a heated saltwater solution, with thermal energy driving chemical reactions that rearrange molecules into a stable final state representing the computed answer. This physical self-organization eliminates the need for error-correction software, since the system's output is dictated by natural thermodynamic principles rather than electrical switching.

The research team tested ten distinct programs covering all four basic arithmetic operations, achieving reliable 100-bit calculations. The zero-electricity design holds particular relevance for Ireland, where data centers consumed roughly 23% of national electricity in 2025. Beyond computation, the researchers envision applications in long-term data storage and molecular sensors capable of operating within living cells for disease detection.