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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.
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.
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Signature-tagged mutagenesis.

S Bakshi1, Y H Sun, R Chalmers

  • 1Department of Paediatrics, University of Oxford, Oxford, UK.

Methods in Molecular Medicine
|February 22, 2011
PubMed
Summary
This summary is machine-generated.

Signature-tagged mutagenesis (STM) enables simultaneous screening of multiple microbial mutants in complex infection models. This powerful technique identifies novel virulence factors by assessing mutant survival in host environments, advancing pathogen research.

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Area of Science:

  • Microbiology
  • Genetics
  • Pathogenesis

Background:

  • Traditional methods for identifying microbial virulence determinants were limited by preconceptions and simple assays.
  • Large-scale genetic screens were previously restricted to in vitro experiments, failing to reflect complex host environments.

Purpose of the Study:

  • To introduce and validate Signature-tagged mutagenesis (STM) as a method for large-scale genetic screening in complex infection models.
  • To overcome the limitations of assessing single mutants in single assays for identifying virulence factors.

Main Methods:

  • Developed Signature-tagged mutagenesis (STM) by uniquely tagging each microbial mutant with a DNA sequence.
  • Administered a pool of tagged mutants to a single host (initially Salmonella typhimurium in animal models) to assess competitive growth.
  • Identified attenuated mutants by their inability to establish infection or by reduced abundance post-infection.

Main Results:

  • STM successfully identified known virulence genes and a novel 40 kb pathogenicity island in Salmonella typhimurium.
  • The technique proved effective in a proof-of-principle study, demonstrating its utility for discovering virulence determinants.
  • STM has since been successfully applied to diverse bacterial and fungal pathogens.

Conclusions:

  • Signature-tagged mutagenesis (STM) is a powerful genetic screening tool that combines the advantages of mutational analysis with biologically relevant assays.
  • STM enables the identification of microbial virulence factors in complex host environments, overcoming limitations of previous methods.
  • This technology significantly advances the study of microbial pathogenesis and the discovery of novel therapeutic targets.