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Related Concept Videos

Antibiotic Selection00:57

Antibiotic Selection

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Related Experiment Video

Updated: Jul 5, 2025

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

Plasmid Stability Analysis with Open-Source Droplet Microfluidics

Published on: December 27, 2024

513

Method for plasmid-based antibiotic-free fermentation.

Katherine E Brechun1, Marion Förschle1, Marlen Schmidt1

  • 1Gen-H Genetic Engineering Heidelberg GmbH, Im Neuenheimer Feld 584, 69120, Heidelberg, Germany.

Microbial Cell Factories
|January 11, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel antibiotic-free plasmid selection method for bacterial fermentation. The technique ensures stable plasmid maintenance, enhancing biological manufacturing and reducing antimicrobial resistance concerns.

Keywords:
Antibiotic resistance genesAntibiotic-freeAntimicrobial resistanceComplementationEscherichia coliFermentationGenome engineeringPlasmid maintenance

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Microbial Engineering

Background:

  • Antibiotic-based plasmid selection is standard but has drawbacks including antimicrobial resistance, cost, and metabolic burden.
  • Antibiotic resistance genes (ARG) are regulated in many products and contribute to resistance.
  • Current methods often lead to plasmid loss in fermentation, reducing product yield.

Purpose of the Study:

  • To develop a novel plasmid selection and maintenance strategy independent of antibiotics and ARG.
  • To provide stringent selection pressure without the limitations of antibiotics.
  • To enable plasmid-based fermentations under various culture conditions.

Main Methods:

  • Engineered a bacterial strain with an essential gene under inducible genomic control.
  • Utilized a plasmid carrying a copy of the essential gene for selection.
  • Demonstrated selection by controlling the inducer for the genomic gene copy.

Main Results:

  • Achieved tight plasmid maintenance through inducible genomic gene expression.
  • Showcased antibiotic-free selection and maintenance across various plasmids and E. coli strains.
  • Confirmed strain propagation without plasmids upon genomic gene induction.

Conclusions:

  • Facilitates plasmid-based fermentations by removing antibiotic requirements.
  • Improves plasmid stability and maintenance in engineered bacterial strains.
  • Offers a regulatory-compliant and cost-effective alternative for biological manufacturing.