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Related Concept Videos

Genomic DNA in Prokaryotes00:46

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
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Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit
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Preparing Plasmid DNA from Bacteria.

Nara Figueroa-Bossi1, Roberto Balbontín2, Lionello Bossi3

  • 1Université Paris-Saclay, CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), 91190 Gif-sur-Yvette, France.

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|August 12, 2022
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Summary
This summary is machine-generated.

Alkaline lysis isolates plasmid DNA by exploiting differences in how plasmid and chromosomal DNA reanneal. This method, often using silica membranes, efficiently separates pure plasmid DNA from contaminants.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Plasmid DNA isolation is crucial for molecular biology applications.
  • The alkaline lysis method is a widely adopted technique for plasmid DNA extraction.
  • Understanding DNA properties is key to efficient isolation procedures.

Purpose of the Study:

  • To detail the alkaline lysis procedure for plasmid DNA isolation.
  • To explain the principles behind DNA separation during alkaline lysis.
  • To compare silica membrane technology with traditional phenol-chloroform extraction.

Main Methods:

  • Alkaline lysis: Denaturation of DNA with alkali followed by neutralization to selectively renature plasmid DNA.
  • Silica membrane technology: Utilizing DNA's affinity for silica in the presence of chaotropic salts for purification.
  • Phenol-chloroform extraction: A traditional kit-free method involving organic solvent extraction and ethanol precipitation.

Main Results:

  • Plasmid DNA, due to its circular covalently closed structure, efficiently reanneals and remains soluble after alkaline lysis.
  • Chromosomal DNA aggregates with proteins during neutralization, facilitating its separation from plasmid DNA.
  • Silica membrane technology effectively binds and purifies plasmid DNA, while phenol-chloroform extraction offers an alternative.

Conclusions:

  • Alkaline lysis is an effective method for isolating plasmid DNA based on differential reannealing kinetics.
  • Silica membrane technology provides a convenient and efficient purification step for plasmid DNA.
  • Both alkaline lysis with silica purification and traditional phenol-chloroform extraction are viable methods for plasmid DNA isolation.