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Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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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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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
Lysogenic Cycle of Bacteriophages00:43

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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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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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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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Updated: Jun 9, 2025

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
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Mycobacteriophages and Their Applications.

Andrea Bonacorsi1, Caterina Ferretti2, Mariagrazia Di Luca1

  • 1Department of Biology, University of Pisa, 56126 Pisa, Italy.

Antibiotics (Basel, Switzerland)
|October 25, 2024
PubMed
Summary

Mycobacteriophages show promise for treating drug-resistant mycobacterial infections. Combining phages with antibiotics enhances efficacy, offering a new therapeutic avenue for challenging infections.

Keywords:
Mycobacterium abscessusMycobacterium aviumMycobacterium smegmatisMycobacterium tuberculosisantibiotic resistancebacteriophageslung infectionsmycobacteriamycobacteriophagesphage therapy

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Area of Science:

  • Microbiology
  • Virology
  • Infectious Diseases

Background:

  • Mycobacterial infections present significant treatment challenges, particularly in immunocompromised individuals.
  • Conventional antibiotic therapies are often ineffective due to rising bacterial resistance.
  • Alternative strategies are crucial for managing these infections.

Purpose of the Study:

  • To review the isolation, characterization, and clinical applications of mycobacteriophages.
  • To assess the efficacy of mycobacteriophages against sensitive and resistant mycobacterial strains.
  • To explore combination therapies and novel delivery methods for phage treatment.

Main Methods:

  • Comprehensive literature review of mycobacteriophage research.
  • Analysis of in vitro and in vivo studies on phage efficacy.
  • Evaluation of phage engineering, delivery systems, and combination therapies.

Main Results:

  • Mycobacteriophages demonstrate efficacy against both antibiotic-sensitive and resistant mycobacteria.
  • Phage cocktails are effective and minimize resistance development.
  • Engineered phages and combination therapy with antibiotics show enhanced therapeutic potential.
  • Phage delivery via bacterial or liposomal vectors facilitates cellular entry.

Conclusions:

  • Mycobacteriophages represent a promising alternative for treating antibiotic-resistant mycobacterial infections.
  • Combination therapy with antibiotics can potentiate phage efficacy.
  • Further in vitro and in vivo studies are needed to fully establish phage therapy's role.