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Related Concept Videos

In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.

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Selection-dependent and Independent Generation of CRISPR/Cas9-mediated Gene Knockouts in Mammalian Cells
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Scarless chromosomal gene knockout methods.

Bong Hyun Sung1, Jun Hyoung Lee, Sun Chang Kim

  • 1Industrial Biotechnology and Bioenergy Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, South Korea.

Methods in Molecular Biology (Clifton, N.J.)
|August 5, 2011
PubMed
Summary
This summary is machine-generated.

A new genomic engineering method allows scarless gene knockouts in Escherichia coli within two days. This rapid technique enables custom microorganism design by efficiently deleting specific genomic regions.

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Genomic engineering is crucial for custom microorganism development.
  • Existing methods for gene knockouts can be time-consuming and complex.
  • Scarless gene deletion is desirable for precise genome manipulation.

Purpose of the Study:

  • To develop an improved and rapid method for scarless chromosomal gene knockouts in Escherichia coli.
  • To enable efficient construction of custom-designed microorganisms.
  • To facilitate genome restructuring via targeted gene deletion.

Main Methods:

  • Utilized a novel plasmid, pREDI, with two inducible promoters (arabinose and rhamnose).
  • Employed λ-RED recombination proteins for scarless replacement of target genomic regions with a DNA cassette.
  • Used I-SceI endonuclease for marker deletion via double-strand break-mediated recombination.
  • Switched carbon source from arabinose to rhamnose to induce sequential promoter activity.

Main Results:

  • Achieved nearly 70% efficiency for targeted region replacement.
  • Demonstrated 100% efficiency for the deletion of the inserted DNA cassette.
  • Successfully restructured the Escherichia coli genome via scarless deletion in just two days.

Conclusions:

  • The developed method provides a rapid and efficient approach for scarless gene knockouts.
  • This technique facilitates the construction of custom-designed microorganisms.
  • The procedure is adaptable for various genome modification applications.