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Related Concept Videos

PCR01:32

PCR

Overview
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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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

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Recombineering Homologous Recombination Constructs in Drosophila
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In vitro 'sexual' evolution through the PCR-based staggered extension process (StEP).

Huimin Zhao1, Wenjuan Zha

  • 1Department of Chemical and Biomolecular Engineering, Institute for Genomic Biology, Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. zhao5@uiuc.edu

Nature Protocols
|May 10, 2007
PubMed
Summary

Directed evolution using the Staggered Extension Process (StEP) enables efficient in vitro recombination of polynucleotide sequences. This modified PCR method generates chimeric DNA libraries for high-throughput functional analysis quickly and without DNA fragmentation.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Synthetic Biology

Background:

  • Directed evolution is crucial for protein and nucleic acid engineering.
  • Existing DNA recombination methods like DNA shuffling can be complex and time-consuming.
  • A need exists for efficient, streamlined in vitro recombination techniques.

Purpose of the Study:

  • To describe a novel directed evolution protocol for in vitro mutagenesis and recombination.
  • To introduce the Staggered Extension Process (StEP) as an efficient method for generating chimeric polynucleotide sequences.
  • To highlight the advantages of StEP over existing DNA recombination methods.

Main Methods:

  • Utilized a modified Polymerase Chain Reaction (PCR) technique known as Staggered Extension Process (StEP).
  • Employed highly abbreviated annealing and extension steps to create staggered DNA fragments.
  • Generated libraries of chimeric polynucleotide sequences through in vitro recombination.
  • Performed high-throughput functional analysis on the resulting DNA libraries.

Main Results:

  • Achieved comparable recombination efficiency to DNA shuffling.
  • Demonstrated the ability to generate chimeric sequences without prior DNA fragmentation.
  • Showcased the protocol's completion within a 4-6 hour timeframe.
  • Confirmed the suitability of StEP for creating diverse DNA libraries.

Conclusions:

  • The Staggered Extension Process (StEP) is a highly efficient and rapid method for in vitro DNA recombination.
  • StEP offers a simplified alternative to DNA shuffling, requiring no DNA fragmentation and enabling single-tube execution.
  • This protocol facilitates the generation of chimeric polynucleotide libraries for advanced functional screening and protein engineering applications.