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Related Concept Videos

Antibiotic Selection00:57

Antibiotic Selection

Overview
Plasmids01:28

Plasmids

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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Plasmid Stability Analysis with Open-Source Droplet Microfluidics
07:43

Plasmid Stability Analysis with Open-Source Droplet Microfluidics

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Stable maintenance of multiple plasmids in E. coli using a single selective marker.

Calvin M Schmidt1, David L Shis, Truong D Nguyen-Huu

  • 1Department of Biochemistry & Cell Biology, Rice University, Houston, Texas, USA.

ACS Synthetic Biology
|May 10, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to stably maintain three plasmids in Escherichia coli using a single antibiotic selective marker, overcoming limitations of traditional multi-plasmid systems.

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Last Updated: May 11, 2026

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Area of Science:

  • Synthetic Biology
  • Bacterial Genetics
  • Molecular Biology

Background:

  • Plasmid-based genetic systems are fundamental in synthetic biology for Escherichia coli.
  • Current methods necessitate unique antibiotic selective markers for each plasmid, increasing host stress and media costs.

Purpose of the Study:

  • To develop a method for stable transformation and maintenance of multiple plasmids in E. coli using a single selective marker.
  • To overcome limitations imposed by multiple antibiotic resistance genes in large-scale synthetic gene circuits.

Main Methods:

  • Investigated two systems for maintaining two plasmids: T7 RNA polymerase-specific regulation and split antibiotic resistance enzymes.
  • Combined these two systems to achieve stable transformation of three plasmids with one selective marker.

Main Results:

  • Successfully demonstrated the stable transformation and maintenance of three distinct plasmids in E. coli.
  • Validated a system that utilizes a single antibiotic selective marker for multiple plasmid retention.

Conclusions:

  • This approach alleviates the need for multiple antibiotic resistance genes in E. coli synthetic biology.
  • Enables the development of larger and more complex plasmid-based synthetic gene circuits without increased selective pressure.