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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Lytic Cycle of Bacteriophages01:30

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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Viral Replication: Lytic Cycle01:20

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Viral Replication: Lysogenic Cycle01:16

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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System
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Ciclo de fagos en una célula sintética

Antoine Levrier1,2,3,4, Paul Soudier5, David Garenne5

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA. alt.levrier@gmail.com.

Nature communications
|December 15, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores crearon un sistema libre de células para estudiar infecciones virales. Este modelo de célula sintética replicó con éxito bacteriófagos T7, ofreciendo una nueva plataforma para la investigación en virología.

Palabras clave:
células sintéticasfagosvirologíabiología sintéticareplicación viralensamblaje viralsistema libre de célulasfago T7

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Área de la Ciencia:

  • Virología
  • Biología Sintética
  • Biología Molecular

Sus antecedentes:

  • La infección viral es un proceso biológico fundamental observado en todos los organismos vivos.
  • El estudio de la replicación viral típicamente requiere células huésped vivas, lo que limita las investigaciones in vitro.

Objetivo del estudio:

  • Establecer un sistema completamente libre de células para reconstruir y analizar el ciclo de infección viral.
  • Utilizar células sintéticas con composiciones de membrana específicas para albergar la replicación viral.

Principales métodos:

  • Desarrollo de células sintéticas con lipopolisacáridos en sus membranas lipídicas.
  • Encapsulación de un sistema de expresión génica libre de células dentro de las células sintéticas.
  • Seguimiento y cuantificación de pasos individuales en el ciclo de infección del fago T7 dentro de las células sintéticas.

Principales resultados:

  • Demostración de la adsorción, entrada del genoma, replicación y ensamblaje del fago T7 dentro de células sintéticas.
  • Cuantificación de parámetros clave de la infección como la multiplicidad de infección y la eficiencia de replicación.
  • Identificación de restricciones en el tamaño de los liposomas y dinámica de la rebifación del fago.

Conclusiones:

  • Se ha establecido con éxito una plataforma totalmente libre de células para la investigación de infecciones virales.
  • Este sistema in vitro proporciona una herramienta definida y versátil para investigar los mecanismos moleculares de la replicación viral.
  • La plataforma permite el estudio detallado de las interacciones virus-huésped utilizando componentes moleculares individuales.