DNA Sequential Logic Circuits for Reversible Counters and Dynamic Biomolecular Sensing

Area of Science:

• Biotechnology
• Molecular Engineering
• Synthetic Biology

Background:

• Computer systems rely on sequential logic circuits for data management.
• Existing DNA sequential logic circuits lack reusability and autonomy.

Purpose of the Study:

• To develop autonomous and reusable DNA sequential logic circuits.
• To address limitations in current DNA-based computing.

Main Methods:

• Implemented a DNA strand replacement system regulated by a nicking enzyme (nickase).
• Engineered Set-Reset (SR) and Data (D) latches using NOR and NAND gates.
• Constructed addition, subtraction, and reversible counters based on these latches.

Main Results:

• Achieved spatiotemporal control over DNA strand displacement.
• Demonstrated simplicity, autonomy, and reusability in the designed DNA circuits.
• Successfully applied DNA latches for transient miRNA recording, environmental toxin detection, and real-time ATP imaging in living cells.

Conclusions:

• The nickase-integrated DNA system offers dynamic control for sequential logic.
• Developed foundational DNA logic gates and circuits with enhanced reusability and autonomy.
• Showcased the potential of these DNA circuits for sophisticated biological applications.