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Related Concept Videos

Conjugation01:19

Conjugation

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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Mechanism of Conjugation01:19

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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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Related Experiment Video

Updated: Feb 17, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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An Optimized Method for Efficient Conjugal Transfer in Flavobacterium covae.

Stacey LaFrentz1, Hannah Smith1, Benjamin R LaFrentz2

  • 1Department of Biological Sciences, Auburn University, Auburn, Alabama, USA.

Journal of Fish Diseases
|February 16, 2026
PubMed
Summary

Researchers optimized a method for transferring genetic material into Flavobacterium covae, a fish pathogen. This improved technique enhances genetic manipulation, aiding the study of virulence factors and disease mechanisms in fish.

Keywords:
Escherichia coliFlavobacterium covaebacterial matingconjugationmutantspCP23transconjugants

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Area of Science:

  • Microbiology
  • Fish Pathology
  • Bacterial Genetics

Background:

  • Flavobacterium covae is a significant fish pathogen responsible for considerable mortality.
  • Understanding its virulence factors is crucial for developing effective disease control strategies.
  • Existing genetic manipulation methods for F. covae are limited, especially for highly virulent strains.

Purpose of the Study:

  • To enhance the efficiency of conjugal transfer in F. covae.
  • To broaden the range of recipient F. covae strains amenable to genetic manipulation.
  • To facilitate further research into F. covae pathogenesis.

Main Methods:

  • Evaluated various parameters including Escherichia coli donor strain, media composition, and donor to recipient cell ratios.
  • Compared an optimized conjugation protocol against a previously established method.
  • Utilized plasmid pCP23 for conjugation experiments.

Main Results:

  • The optimized method significantly increased conjugal transfer efficiency across multiple F. covae strains.
  • Successful transfer of pCP23 into seven out of eleven F. covae strains, compared to four with the previous method.
  • Achieved orders of magnitude higher conjugation efficiency, with one strain showing 1.2 × 10^6 transconjugants per 10^9 recipients (p < 0.0001).

Conclusions:

  • An optimized conjugation method has been developed for F. covae.
  • This improved method increases the efficiency and scope of genetic manipulation in virulent F. covae strains.
  • Facilitates deeper investigation into the molecular basis of F. covae pathogenicity.