Aptamer-based regulation of transcription circuits.

We propose synthetic DNA/RNA transcription circuits based on specific aptamer recognition. By mimicking transcription factor regulation, combined with specific enzyme/DNA aptamer binding, multiple biomolecules including DNA, RNA, polymerase, restriction enzymes and methylase were used as regulators. In addition, multi-level cascading networks and methylation-switch circuits were also established. This regulation strategy has the potential to expand the toolkit of in vitro synthetic biology.