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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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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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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Related Experiment Video

Updated: Apr 29, 2026

Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach
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Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach

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Plasmid copy number and plasmid stability.

Karl Friehs1

  • 1Universität Bielefeld AG, Fermentationstechnik, Technische Fakultät, 33501 Bielefeld, Germany. karl.friehs@uni-bielefeld.de

Advances in Biochemical Engineering/Biotechnology
|April 20, 2004
PubMed
Summary

Plasmids are crucial for recombinant protein production, impacting productivity through copy number and stability. Understanding and controlling these factors is key to optimizing expression systems and ensuring product quality.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Biochemistry

Background:

  • Plasmids serve as essential vectors in research and industry for producing recombinant substances.
  • Plasmid characteristics significantly influence the productivity of expression systems.

Purpose of the Study:

  • To review methods for quantifying plasmid copy number.
  • To discuss strategies for maintaining structural and segregational plasmid stability.
  • To address stability considerations for plasmids used as pharmaceuticals.

Main Methods:

  • Quantification of plasmid copy number.
  • Analysis of structural plasmid stability.
  • Methods to prevent segregational instability in cultures.
  • Assessment of stability during downstream processing, application, storage, and shipping.

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Main Results:

  • Plasmid copy number directly correlates with gene dosage and influences productivity.
  • Structural plasmid instability requires specific analytical methods.
  • Segregational instability, leading to plasmid-free cells, significantly reduces productivity.
  • Pharmaceutical applications necessitate evaluation of stability beyond cell culture.

Conclusions:

  • Controlling plasmid copy number and stability is vital for efficient recombinant production.
  • A range of methods exist for analyzing and maintaining plasmid integrity.
  • Ensuring plasmid stability is critical from laboratory scale to industrial application and pharmaceutical use.