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Related Concept Videos

Bacterial Transformation01:33

Bacterial Transformation

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
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Updated: Jan 17, 2026

Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
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Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit.

Jelmar de Vries1, Timon A Lindeboom2, Stijn T de Vries2

  • 1Laboratory of Systems and Synthetic Biology (SSB), Wageningen University and Research, Agrotechnology and Food Sciences.

Journal of Visualized Experiments : Jove
|September 22, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a new method for assembling polycistronic operons using Modular Cloning (MoClo) toolkits. The In- & Out-Cloning toolkit facilitates efficient construction of complex DNA molecules for synthetic biology applications.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Modular Cloning (MoClo) enables rapid assembly of multigene constructs using Golden Gate cloning with Type IIS restriction enzymes.
  • MoClo allows for highly efficient DNA fragment assembly in a single reaction by using standardized overhangs and preventing cutting of joined fragments.
  • Existing bacterial MoClo toolkits primarily focus on monocistronic units, lacking structured methods for polycistronic operon assembly.

Purpose of the Study:

  • To demonstrate a protocol for assembling polycistronic transcription units using the In- & Out-Cloning toolkit.
  • To provide a transferable method for constructing polycistronic operons applicable to various MoClo systems.
  • To expand the capabilities of MoClo toolkits for complex genetic circuit design.

Main Methods:

  • Utilized the In- & Out-Cloning toolkit, a variant of Modular Cloning (MoClo).
  • Employed Type IIS restriction enzymes for directed DNA assembly with specific overhangs.
  • Assembled multiple DNA parts, including promoters, RBS, coding sequences, and terminators, into polycistronic transcription units.

Main Results:

  • Successfully demonstrated the assembly of polycistronic transcription units using the In- & Out-Cloning toolkit.
  • The developed protocol enables efficient and modular construction of operons.
  • The method is shown to be transferable to other MoClo toolkits.

Conclusions:

  • The In- & Out-Cloning toolkit provides a structured approach for assembling polycistronic operons.
  • This protocol enhances the utility of MoClo for constructing complex genetic systems in bacteria.
  • The findings facilitate advanced synthetic biology applications requiring polycistronic gene expression.