Circular single-stranded DNA as a programmable vector for gene regulation in cell-free protein expression systems

Area of Science:

• Synthetic biology
• Molecular biology
• Biotechnology

Background:

• Cell-free protein expression (CFE) systems are vital for synthetic biology.
• Current CFE systems primarily use double-stranded DNA or single-stranded RNA vectors.
• Novel vector systems are needed to enhance CFE capabilities.

Purpose of the Study:

• To introduce and characterize circular single-stranded DNA (CssDNA) as a programmable vector for CFE.
• To demonstrate CssDNA's utility in gene expression and regulation within a yeast-based CFE system.
• To explore the potential of CssDNA in constructing gene regulatory logic gates.

Main Methods:

• Utilized a yeast-based cell-free protein expression system.
• Engineered circular single-stranded DNA (CssDNA) molecules for gene expression.
• Investigated the processing of CssDNA by DNA and RNA polymerases.
• Designed and tested sense and antisense CssDNA for gene regulation.
• Constructed gene regulatory logic gates using CssDNA.

Main Results:

• CssDNA was successfully processed by DNA and RNA polymerases for gene expression in a yeast CFE system.
• CssDNA demonstrated programmability for gene regulation through sense and antisense pathways.
• CssDNA was engineered into functional gene regulatory logic gates.
• The findings highlight CssDNA's versatility beyond DNA nanotechnology.

Conclusions:

• Circular single-stranded DNA (CssDNA) represents a novel and programmable vector for cell-free protein expression.
• CssDNA expands the synthetic biology toolbox by enabling sophisticated gene expression and regulation strategies.
• This work advances the understanding and application of CssDNA in synthetic biology.