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Engineered bacterial orthogonal DNA replication system for continuous evolution.

Rongzhen Tian1,2,3,4, Runzhi Zhao1,2,3,4, Haoyu Guo1,2,3,4

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Scientists developed a bacterial orthogonal DNA replication system (BacORep) for continuous evolution. This powerful tool significantly increases mutation rates in bacteria, enabling the generation of novel biomolecules and improved cellular functions.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Microbial Evolution

Background:

  • Continuous evolution methods are crucial for generating novel biomolecules and understanding evolutionary processes.
  • Existing orthogonal DNA replication systems (OrthoRep) are efficient in yeast but absent in bacteria.
  • A bacterial system is needed to facilitate high-throughput mutation and directed evolution in prokaryotes.

Purpose of the Study:

  • To develop a novel bacterial orthogonal DNA replication system (BacORep) for continuous evolution.
  • To engineer an error-prone orthogonal DNA polymerase and adapt phage replication machinery for bacterial use.
  • To demonstrate the utility of BacORep for generating functional biomolecules and enhancing microbial traits.

Main Methods:

  • Harnessing the temperate phage GIL16 replication machinery in Bacillus thuringiensis.
  • Developing an engineered error-prone orthogonal DNA polymerase.
  • Utilizing orthogonally replicating linear plasmids for high-frequency mutagenesis.
  • Applying BacORep for directed evolution of promoters and metabolic pathways.

Main Results:

  • BacORep achieves a 6,700-fold higher mutation rate compared to the host genome without affecting the host's mutation rate.
  • All 12 types of nucleotide substitutions were introduced into 15-kilobase genes.
  • Generated strong promoters functional in Bacillus subtilis and Escherichia coli.
  • Achieved a 7.4-fold increase in methanol assimilation in Bacillus thuringiensis.

Conclusions:

  • BacORep is a powerful and efficient tool for continuous evolution in prokaryotic cells.
  • This system significantly expands the capabilities for synthetic biology and evolutionary engineering in bacteria.
  • BacORep facilitates the rapid generation of improved microbial strains and novel biological functions.