Enzyme-Free Exponential Amplification via Growth and Scission of Crisscross Ribbons from Single-Stranded DNA...

Area of Science:

• Biomolecular Engineering
• Synthetic Biology
• Nanotechnology

Background:

• DNA self-assembly into higher-order structures enables biomimetic behaviors like algorithmic assembly and self-replication.
• High energetic barriers are needed to prevent spurious nucleation, but must be bypassable for controlled assembly.
• Joint-neighbor capture is a mechanism for creating these barriers while allowing algorithmic functions.

Purpose of the Study:

• To expand crisscross assembly for autonomous, isothermal exponential amplification of DNA ribbons.
• To develop a DNA-based detection strategy using this amplified system.
• To introduce a modeling approach for simulating complex molecular self-assembly.

Main Methods:

• Utilized joint-neighbor capture and toehold-mediated strand displacement for DNA ribbon growth and scission.
• Developed the crisscross chain reaction (3CR) for exponential amplification.
• Coupled 3CR to single- and double-stranded nucleic acid targets for detection.
• Employed a rule-based stochastic modeling approach to simulate self-assembly dynamics.

Main Results:

• Achieved autonomous, isothermal exponential amplification of DNA ribbons via concurrent growth and scission.
• Demonstrated the 3CR as a sensitive detection strategy for nucleic acid targets.
• Successfully simulated complex molecular self-assembly behaviors, including ribbon scission.

Conclusions:

• The 3CR provides a robust method for seed-dependent, exponential DNA self-assembly.
• This system offers a versatile platform for ultrasensitive detection and biomimetic material development.
• Stochastic modeling aids in understanding and designing complex DNA self-assembly processes.