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Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
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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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Why Johnny can't clone: Common pitfalls and not so common solutions.

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  • 1Department of Biochemistry, Emory University School of Medicine, Rollins Research Center, Atlanta, GA.

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Summary

Producing recombinant plasmids can be challenging, but understanding the chemical properties of cloning enzymes and reagents helps overcome common pitfalls. This review details key methods for successful gene cloning and plasmid production.

Keywords:
DNA purificationPCRT4 DNA ligaseelectrophoresisligation dependent cloningmolecular cloningrestriction endonuclease

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Area of Science:

  • Molecular Biology
  • Biotechnology

Background:

  • The demand for cloned genes and recombinant plasmids has steadily increased over the last 32 years.
  • Despite advancements, many researchers encounter difficulties in producing recombinant plasmids using traditional methods.

Purpose of the Study:

  • To review the chemical properties of enzymes and reagents used in gene cloning.
  • To highlight critical details and common pitfalls in traditional ligation-dependent cloning.
  • To provide insights for troubleshooting and developing new cloning techniques.

Main Methods:

  • Review of established methods in gene cloning and plasmid production.
  • Exploration of the chemical properties of DNA modifying enzymes (thermostable DNA polymerases, restriction endonucleases, T4 DNA ligase).
  • Discussion of DNA-purification techniques (DNA-silica interactions) and quality control (agarose gel electrophoresis).

Main Results:

  • Detailed examination of factors influencing the efficiency of DNA modifying enzymes and T4 DNA ligase.
  • Identification of common challenges in Escherichia coli transformation.
  • Emphasis on the importance of understanding enzyme kinetics and reagent interactions for successful cloning.

Conclusions:

  • A thorough understanding of established gene cloning methods is crucial for troubleshooting and optimizing recombinant plasmid production.
  • Knowledge of chemical properties and potential pitfalls enhances the reliability of cloning techniques.
  • This review serves as a guide for researchers to improve their success rates in gene cloning and plasmid construction.