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Filter-supported preparation of lambda phage DNA.

R Jakobi1, S Wiemann, W Pyerin

  • 1Institute of Experimental Pathology, German Cancer Research Center, Heidelberg.

Analytical Biochemistry
|November 15, 1988
PubMed
Summary
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This study presents a fast and easy method for isolating DNA from phage lambda. The technique yields microgram quantities of DNA efficiently, suitable for various molecular biology applications.

Area of Science:

  • Molecular Biology
  • Virology
  • Biotechnology

Background:

  • Traditional methods for isolating phage lambda DNA are often time-consuming and require specialized equipment or expensive reagents.
  • There is a need for a more accessible and efficient DNA isolation protocol for phage lambda, particularly for high-throughput applications.

Purpose of the Study:

  • To develop and describe a rapid, simple, and cost-effective method for isolating DNA from phage lambda.
  • To demonstrate the utility of the isolated DNA for downstream molecular biology applications.

Main Methods:

  • Phage lambda precipitation using polyethylene glycol (PEG) and sodium chloride.
  • Recovery of precipitated phages using low-speed centrifugation onto glass fiber filters within disposable syringes.
  • DNA elution using a 50% formamide/4 M sodium perchlorate solution, followed by washing and elution with low-salt buffer.

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Main Results:

  • Microgram quantities of lambda DNA were isolated in under 2 hours from plate lysates or liquid cultures.
  • The method is suitable for simultaneous isolation of numerous probes, such as clones from phage libraries.
  • Isolated DNA demonstrated comparable recovery and suitability for restriction enzyme digestion and subcloning compared to conventional methods.

Conclusions:

  • The described method offers a rapid, simple, and economical alternative for phage lambda DNA isolation.
  • This protocol is highly applicable for researchers requiring large numbers of DNA probes or working with limited resources.
  • The isolated DNA is of sufficient quality for standard molecular biology manipulations.