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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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Bacterial Transformation01:33

Bacterial Transformation

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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.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
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Bacterial Phylum Firmicutes01:27

Bacterial Phylum Firmicutes

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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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Video Experimental Relacionado

Updated: Feb 17, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Un método optimizado para la transferencia conjugativa eficiente en 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
Resumen

Los investigadores optimizaron un método para transferir material genético a Flavobacterium covae, un patógeno de peces. Esta técnica mejorada mejora la manipulación genética, lo que ayuda al estudio de los factores de virulencia y los mecanismos de enfermedad en los peces.

Palabras clave:
Escherichia coliFlavobacterium covaeapareamiento bacterianoconjugaciónmutantespCP23transconjugantes

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Área de la Ciencia:

  • Microbiología
  • Patología de Peces
  • Genética Bacteriana

Sus antecedentes:

  • Flavobacterium covae es un patógeno de peces importante responsable de una mortalidad considerable.
  • La comprensión de sus factores de virulencia es crucial para desarrollar estrategias efectivas de control de enfermedades.
  • Los métodos existentes de manipulación genética para F. covae son limitados, especialmente para cepas altamente virulentas.

Objetivo del estudio:

  • Mejorar la eficiencia de la transferencia conjugativa en F. covae.
  • Ampliar el rango de cepas receptoras de F. covae susceptibles a la manipulación genética.
  • Facilitar la investigación adicional sobre la patogénesis de F. covae.

Principales métodos:

  • Se evaluaron varios parámetros, incluida la cepa donante de Escherichia coli, la composición del medio y las proporciones de células donantes a receptoras.
  • Se comparó un protocolo de conjugación optimizado con un método establecido previamente.
  • Se utilizó el plásmido pCP23 para experimentos de conjugación.

Principales resultados:

  • El método optimizado aumentó significativamente la eficiencia de transferencia conjugativa en múltiples cepas de F. covae.
  • Transferencia exitosa de pCP23 a siete de once cepas de F. covae, en comparación con cuatro con el método anterior.
  • Se lograron órdenes de magnitud de eficiencia de conjugación más altos, con una cepa que mostró 1.2 × 10^6 transconjugantes por 10^9 receptores (p < 0.0001).

Conclusiones:

  • Se ha desarrollado un método de conjugación optimizado para F. covae.
  • Este método mejorado aumenta la eficiencia y el alcance de la manipulación genética en cepas virulentas de F. covae.
  • Facilita una investigación más profunda de la base molecular de la patogenicidad de F. covae.