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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.

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).

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.

Translesion DNA Polymerases

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...

Proofreading

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme

Proofreading

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...

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Related Experiment Video

Updated: Jul 5, 2026

Homemade Site Directed Mutagenesis of Whole Plasmids

Homemade Site Directed Mutagenesis of Whole Plasmids

Published on: May 11, 2009

Directed mutagenesis using the polymerase chain reaction.

¹Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Current Protocols in Neuroscience

|April 23, 2008

Summary

This study demonstrates polymerase chain reaction (PCR) techniques for precise DNA sequence modification. Researchers can efficiently introduce specific mutations or restriction sites into DNA using these PCR-based methods.

Area of Science:

Molecular Biology
Genetic Engineering

Background:

The polymerase chain reaction (PCR) is a standard technique for amplifying nucleic acids.
Modifying DNA sequences is crucial for various biological and biotechnological applications.

Purpose of the Study:

To present protocols for introducing specific sequence changes into DNA using PCR.
To detail methods for incorporating restriction sites and generating point mutations.

Main Methods:

Utilizing PCR with specifically designed synthetic oligonucleotide primers.
Employing two basic protocols for DNA sequence alteration.
An alternate protocol for generating point mutations through sequential PCR steps.

Main Results:

Successful introduction of a restriction site into the DNA of interest.

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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

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Published on: March 16, 2011

Related Experiment Videos

Last Updated: Jul 5, 2026

Homemade Site Directed Mutagenesis of Whole Plasmids

Homemade Site Directed Mutagenesis of Whole Plasmids

Published on: May 11, 2009

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

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Published on: March 16, 2011

Efficient generation of specific point mutations within DNA sequences.

Demonstration of PCR's versatility beyond nucleic acid amplification.

Conclusions:

PCR is a powerful and efficient tool for site-directed mutagenesis and DNA sequence engineering.
The described protocols offer flexibility in designing synthetic oligonucleotide primers for desired DNA modifications.
These methods facilitate the precise alteration of DNA sequences for research purposes.