A single-step photolithographic interface for cell-free gene expression and active biochips

Area of Science:

• Biotechnology
• Molecular Biology
• Bioengineering

Background:

• Cell-free gene expression systems offer a powerful tool for biological research and synthetic biology.
• Developing miniaturized, controllable platforms for on-chip gene expression remains a significant challenge.
• Surface chemistry limitations often hinder the creation of functional biochips for complex biological processes.

Purpose of the Study:

• To develop a novel biochip platform technology for controlled, micrometer-scale cell-free gene expression.
• To enable high-density immobilization of DNA and on-chip protein synthesis with high dynamic range.
• To demonstrate the feasibility of building artificial gene circuits and miniaturized protein chips.

Main Methods:

• Synthesis of a hybrid molecule, 'Daisy', to create a biocompatible lithographic interface on silicon dioxide.
• Immobilization of long linear DNA molecules onto Daisy-coated surfaces with submicrometer spatial resolution.
• On-chip protein synthesis and demonstration of a two-stage gene cascade using diffusion-based regulation.

Main Results:

• Achieved controlled cell-free gene expression at the micrometer scale with minimal nonspecific activity.
• Demonstrated on-chip protein synthesis with a dynamic range of up to four orders of magnitude.
• Successfully constructed a two-stage gene cascade and captured synthesized proteins onto designated traps.

Conclusions:

• The developed biochip platform, utilizing the 'Daisy' molecule, facilitates accessible construction of active biochips.
• This technology supports on-chip artificial gene circuits and miniaturized self-assembled protein chips.
• Integration with microfluidic devices opens possibilities for artificial cells and confined reaction chambers.