Why Johnny can't clone: Common pitfalls and not so common solutions

BioTechniques
Ichiro Matsumura

Abstract

The demand for cloned genes has increased incessantly over the past 32 years, but some who need recombinant plasmids struggle to produce them. While the pitfalls of traditional ligation-dependent cloning are non-trivial, most can be avoided with sufficient effort and attention to detail. Here, the chemical properties of enzymes and reagents used to clone genes into plasmids are reviewed to draw attention to the most pertinent details. In particular, the virtues of agarose gel electrophoresis monitoring, the nature of the interactions between DNA and silica, and challenges associated with thermostable DNA polymerases, restriction endonucleases, and T4 DNA ligase are explored. Common pitfalls associated with Escherichia coli transformation and DNA modifying enzymes are also described. A thorough understanding of established methods is essential for troubleshooting, implementing alternative approaches, and inventing new techniques in response to changes in technology and demand.

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Methods Mentioned

BETA
PCR
electrophoresis
restriction digest
restriction
transfection
restriction digests

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