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In vitro Mutagenesis

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 Mutagenesis

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 Mutations

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).

Mutations in Microorganisms

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

Mutations

Mutations

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Related Experiment Video

Updated: Jun 21, 2026

The Lambda Select cII Mutation Detection System

The Lambda Select cII Mutation Detection System

Published on: April 26, 2018

Lethal mutagenesis in a structured environment.

Shelby H Steinmeyer¹, Claus O Wilke

¹Department of Mathematics, The University of Texas at Austin, Austin, TX 78712, USA.

Journal of Theoretical Biology

|July 25, 2009

Summary

This summary is machine-generated.

Lethal mutagenesis in compartmentalized hosts depends on mutagen levels and virion migration. Refugia compartments can prevent extinction if migration is low, but extensive migration neutralizes refugia, requiring lower mutagen doses for viral extinction.

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Site-Directed Mutagenesis for In Vitro and In Vivo Experiments Exemplified with RNA Interactions in Escherichia Coli

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Last Updated: Jun 21, 2026

The Lambda Select cII Mutation Detection System

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Published on: April 26, 2018

Site-Directed Mutagenesis for In Vitro and In Vivo Experiments Exemplified with RNA Interactions in Escherichia Coli

Site-Directed Mutagenesis for In Vitro and In Vivo Experiments Exemplified with RNA Interactions in Escherichia Coli

Published on: February 5, 2019

Area of Science:

Virology
Evolutionary Biology
Mathematical Biology

Background:

Lethal mutagenesis is a strategy to induce viral extinction through accumulated mutations.
Compartmentalization within a host can create refugia, hindering uniform mutagen exposure.
Virion migration between compartments can alter the effectiveness of mutagenic treatments.

Purpose of the Study:

To investigate the impact of refugia and virion migration on lethal mutagenesis efficacy.
To determine conditions under which refugia can prevent host extinction.
To assess how migration influences the success of mutagenic treatments in compartmentalized systems.

Main Methods:

Mathematical modeling of viral dynamics in a compartmentalized host.
Analysis of virion migration rates between compartments.
Simulation of varying mutagen concentrations across different compartments.

Main Results:

Low migration necessitates high mutagen doses to overcome refugia and achieve extinction.
High migration effectively neutralizes refugia, allowing extinction if average viral growth is suppressed.
The basic reproduction number (R(0)) governs migration's effectiveness in neutralizing refugia.

Conclusions:

Refugia effectiveness is inversely related to migration rates.
Migration can significantly enhance lethal mutagenesis by homogenizing mutagen exposure.
Optimizing lethal mutagenesis requires considering both compartmentalization and inter-compartment virion movement.