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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.
PCR - Polymerase Chain Reaction01:32

PCR - Polymerase Chain Reaction

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Generation of a Gene-disrupted Streptococcus mutans Strain Without Gene Cloning
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Published on: October 23, 2017

Primer extension mutagenesis powered by selective rolling circle amplification.

Tuomas Huovinen1, Eeva-Christine Brockmann, Sultana Akter

  • 1Department of Biochemistry and Food Chemistry, University of Turku, Turku, Finland. tuomas.huovinen@utu.fi

Plos One
|February 23, 2012
PubMed
Summary

This study enhances primer extension mutagenesis for in vitro evolution. Selective rolling circle amplification (sRCA) boosts mutagenesis efficiency to nearly 100% and increases transformants 300-fold, creating large gene libraries with minimal DNA.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • Primer extension mutagenesis is a key technique for creating mutant libraries for in vitro evolution.
  • Existing methods, like Kunkel's, have limitations in mutagenesis efficiency and require complex cell-based selection.
  • Improvements are needed to enhance efficiency and simplify the selection process for library generation.

Purpose of the Study:

  • To improve primer extension mutagenesis efficiency and simplify library creation.
  • To develop a method that increases mutagenesis efficiency and the number of transformants.
  • To replace complex cell-based selection with a more controllable enzyme-based method.

Main Methods:

  • Utilized uracil-containing single-stranded DNA as a template for primer extension.
  • Incorporated uracil-DNA glycosylase treatment and rolling circle amplification (RCA).
  • Developed selective RCA (sRCA) using phi29 DNA polymerase for preferential amplification of mutated DNA strands.

Main Results:

  • Achieved mutagenesis efficiency close to 100%, a significant increase from 50%.
  • Increased the number of transformants by 300-fold without compromising diversity.
  • Demonstrated the creation of a gene library with ten billion members using only 240 nanograms of DNA.

Conclusions:

  • Selective RCA (sRCA) effectively enhances primer extension mutagenesis efficiency and transformant yield.
  • sRCA replaces complex cell-based selection with a more efficient enzyme-based system.
  • The improved method enables the construction of large, high-diversity gene libraries with reduced DNA input.