Functional Surface-immobilization of Genes Using Multistep Strand Displacement Lithography

Area of Science:

• Biotechnology
• Synthetic Biology
• Microfluidics

Background:

• Studying compartmentalized gene expression is crucial for understanding cellular processes.
• Existing artificial cellular systems face limitations in reagent supply and waste removal.
• Long-term cell-free gene expression is essential for dynamic gene regulatory feedback systems.

Purpose of the Study:

• To develop a protocol for fabricating genetic biochips for compartmentalized gene expression.
• To integrate these biochips with a microfluidic system for extended cell-free expression.
• To demonstrate the compatibility with advanced microscopy for molecular interaction studies.

Main Methods:

• Lithographic fabrication of genetic biochips utilizing DNA strand displacement reactions.
• Integration of biochips with polydimethylsiloxane (PDMS)-based microfluidic systems.
• Utilizing total internal reflection fluorescence (TIRF) microscopy for direct observation.

Main Results:

• Successful fabrication of genetic biochips using commercially available components.
• Demonstrated continuous supply of reagents and waste removal in an open microfluidic system.
• Confirmed compatibility with TIRF microscopy for observing DNA-molecule interactions.

Conclusions:

• The developed genetic biochip and microfluidic system facilitate long-term, compartmentalized cell-free gene expression.
• This approach offers a valuable tool for studying dynamic gene regulatory networks.
• The system's compatibility with TIRF microscopy enables direct visualization of molecular processes.