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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Genetically Encoded Control of In Vitro Transcription-Translation Coupled DNA Replication.

Sebastian Barthel1, Maximilian Hoffmann-Becking1, Islomjon G Karimov1

  • 1Department of Biochemistry & Synthetic Metabolism, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Str. 10, Marburg 35043, Germany.

ACS Synthetic Biology
|September 19, 2025
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Summary

Scientists developed a novel transcription-translation coupled DNA replication (TTcDR) system using a modified PURE system. This breakthrough enables controlled DNA replication in vitro, paving the way for synthetic biology advancements.

Keywords:
PURE systemgenetic circuitgenetically encoded system controlin vitro systemssynthetic celltranscription−translation coupled DNA replication (TTcDR)

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Bottom-up reconstruction of cellular functions is crucial for understanding biological complexity and developing synthetic cells.
  • Controlling DNA-encoded information within in vitro transcription-translation (IVTT) systems presents a fundamental challenge.

Purpose of the Study:

  • To construct and characterize a transcription-translation coupled DNA replication (TTcDR) system.
  • To establish TetR-based regulatory control over the TTcDR system for precise DNA replication management.

Main Methods:

  • Utilized a modified PURE (Protein synthesis Using Recombinant Elements) IVTT system.
  • Incorporated Φ29 DNA polymerase for DNA replication.
  • Engineered TetR-based genetic circuits for inducible and repressible control of TTcDR activity.

Main Results:

  • Established and characterized a PUREfrex 1.0-based TTcDR system.
  • Successfully implemented TetR-based control, achieving approximately 1000-fold DNA replication.
  • Demonstrated robust repression (∼100-fold) and induction (∼4-fold) using anhydrotetracycline.

Conclusions:

  • The developed TTcDR system offers a controllable platform for in vitro DNA replication.
  • This system holds potential for applications in synthetic biology, such as directed evolution of in vitro systems.
  • Highlights the feasibility and challenges in regulating in vitro DNA replication processes.