In vitro self-replication and multicistronic expression of large synthetic genomes

Area of Science:

• Synthetic biology
• Molecular biology
• Biochemistry

Background:

• A key goal in synthetic biology is creating chemical systems that can replicate and evolve.
• Reconstitution of a minimal self-sustaining central dogma (DNA replication, transcription, translation) is a potential approach.

Purpose of the Study:

• To develop an in vitro translation system enabling self-encoded replication and expression of large DNA genomes.
• To establish cell-free conditions for studying minimal biological systems.

Main Methods:

• Demonstrated self-replication of a multipartite genome (>116 kb) in a cell-free system.
• The genome included essential components like translation factors, ribosomal RNAs, an energy regeneration system, and polymerases.
• Assessed the synthesis of encoded translation factors in parallel with DNA replication.

Main Results:

• Achieved self-replication of a large DNA genome (>116 kb) under cell-free conditions.
• Synthesized at least 30 encoded translation factors.
• Observed that half of the synthesized factors were expressed at levels equal to or greater than input levels.

Conclusions:

• An optimized cell-free expression platform was developed.
• This platform can serve as a chassis for generating partially self-replicating in vitro translation systems.
• Advances synthetic biology by enabling in vitro reconstitution of core biological processes.