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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.
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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Related Experiment Video

Updated: Jun 12, 2026

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

Gene switching and essentiality testing.

Amanda Claire Brown1

  • 1Institute of Cell and Molecular Science, Barts and the London, Queen Mary's School of Medicine and Dentistry, 4 Newark Street, Whitechapel, London E1 2AA, UK. a.c.brown@qmul.ac.uk

Methods in Molecular Biology (Clifton, N.J.)
|June 19, 2010
PubMed
Summary

Confirming essential genes in mycobacteria is challenging due to lethal phenotypes. This study presents a gene switching protocol to confirm essentiality by replacing a chromosomal gene copy, aiding essential gene identification and functional analysis.

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Last Updated: Jun 12, 2026

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Identifying essential genes is crucial for mycobacterial research.
  • Confirming gene essentiality is difficult because gene deletion leads to cell death.

Purpose of the Study:

  • To describe protocols for confirming gene essentiality in mycobacteria using gene switching.
  • To enable the identification of essential genes, functional homologues, and essential operon members.

Main Methods:

  • Construction of a 'delinquent' strain with a second gene copy introduced via an integrating vector.
  • Deletion of the chromosomal gene copy.
  • Replacement of the integrated vector using the gene switching method.

Main Results:

  • Absence of transformants after gene switching confirms essentiality.
  • The technique successfully confirms gene essentiality.
  • The method is applicable for confirming gene homologue functionality and identifying essential operon members.

Conclusions:

  • The described gene switching protocol provides a reliable method for confirming essential gene identification in mycobacteria.
  • This technique facilitates further research into mycobacterial genetics and potential therapeutic targets.