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Related Experiment Videos

Denaturing polyacrylamide gel electrophoresis.

L M Albright1, B E Slatko

  • 1New England Biolabs, Beverly, Massachusetts, USA.

Current Protocols in Nucleic Acid Chemistry
|April 23, 2008
PubMed
Summary
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Thin polyacrylamide gels with high urea concentrations can resolve short DNA or RNA fragments differing by one nucleotide. This technique is crucial for nucleic acid sequencing and footprinting protocols.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Polyacrylamide gel electrophoresis (PAGE) is a standard technique for separating nucleic acids.
  • High urea concentrations are used as denaturants in PAGE to separate single-stranded nucleic acids.
  • Nucleic acid sequencing and footprinting protocols require high-resolution separation of DNA and RNA fragments.

Purpose of the Study:

  • To describe the preparation and use of thin polyacrylamide gels for high-resolution nucleic acid sequencing.
  • To detail the pouring, running, and processing of a typical 40 cm sequencing gel.

Main Methods:

  • Pouring thin (0.4 mm) polyacrylamide gels (4%-8% acrylamide).
  • Incorporating a high concentration of urea (7 M) as a denaturant.
  • Running gels to resolve short single-stranded DNA or RNA fragments (<500 nucleotides).

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Main Results:

  • Gels effectively resolve fragments differing in length by a single nucleotide.
  • Demonstrated suitability for nucleic acid sequence analysis.
  • Thicker gels can be used for oligonucleotide purification.

Conclusions:

  • Thin, high-urea polyacrylamide gels are optimal for high-resolution nucleic acid sequencing.
  • The described protocol provides a method for preparing and running these essential sequencing gels.
  • This technique is fundamental for various molecular biology applications, including footprinting.