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DNA Bacteriophages

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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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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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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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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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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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Working with Bacteria, Phage, and Plasmids.

Nara Figueroa-Bossi1, Roberto Balbontín2, Lionello Bossi3

  • 1Université Paris-Saclay, CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), 91190 Gif-sur-Yvette, France.

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Summary
This summary is machine-generated.

Advanced molecular techniques enable precise bacterial genome editing in vivo. This study details essential laboratory protocols for manipulating Escherichia coli and Salmonella enterica, crucial for genetic research.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Bacterial genome manipulation techniques have advanced significantly due to new discoveries and DNA sequencing.
  • Successful in vivo manipulation relies on precise execution of various technical routines.

Purpose of the Study:

  • To introduce and review key laboratory procedures for the in vivo manipulation of bacterial genomes.
  • To focus on methods applicable to Escherichia coli and Salmonella enterica.

Main Methods:

  • Review of established and cutting-edge techniques for bacterial genome editing.
  • Discussion of biological aspects of Escherichia coli and Salmonella enterica relevant to laboratory manipulation.

Main Results:

  • Detailed explanation of critical technical routines for successful genome manipulation experiments.
  • Identification of key biological features of E. coli and S. enterica pertinent to genetic modification.

Conclusions:

  • Effective in vivo genome manipulation in bacteria like E. coli and S. enterica is achievable with careful protocol adherence.
  • The study provides a foundational guide for researchers working with these important bacterial species.