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Related Concept Videos

DNA Bacteriophages01:26

DNA Bacteriophages

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...
Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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 lytic replication...
Bacteriophages of the Human Virome01:23

Bacteriophages of the Human Virome

Bacteriophages are found throughout the human body. They may even outnumber eukaryotic viruses, forming an important and dynamic component of the human virome. Indeed, phages represent the most abundant viral entities, with densities in the gut reaching up to 10⁹ particles per gram of fecal matter, and many belonging to orders such as Caudovirales and Microviridae, while a substantial proportion remains unclassified as viral “dark matter.”Lysogeny and Genetic ExchangeIn the gut, bacteriophages...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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...
Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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...
Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

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 its...

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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
09:40

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

Published on: June 11, 2015

Bacteriophages and their genomes.

Graham F Hatfull1, Roger W Hendrix

  • 1Pittsburgh Bacteriophage Institute and Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA. gfh@pitt.edu

Current Opinion in Virology
|October 29, 2011
PubMed
Summary
This summary is machine-generated.

Bacteriophage genomics reveals vast genetic diversity and billions of years of evolution, driven by horizontal gene exchange. Further exploration of these abundant viruses promises significant biological insights.

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Area of Science:

  • Microbiology
  • Virology
  • Genomics

Background:

  • Bacteriophages are the most abundant organisms, crucial for understanding biosphere diversity.
  • Their small genomes suggest feasibility in studying phage origins and evolution.
  • Recent challenges include shifting from known to novel phage characterization.

Purpose of the Study:

  • To summarize the current state of bacteriophage genomics.
  • To highlight the genetic diversity and evolutionary history of phages.
  • To emphasize the need for exploring new phage isolates.

Main Methods:

  • Comparative analysis of bacteriophage genomes.
  • Isolation and sequencing of new phage isolates.
  • Genomic data analysis to infer evolutionary mechanisms.

Main Results:

  • Bacteriophage populations exhibit extremely high genetic diversity.
  • Phages have evolved over billions of years, with significant horizontal genetic exchange.
  • Phage genomes are characterized by pervasive mosaic architectures.

Conclusions:

  • The study of bacteriophage genomics is essential for understanding microbial evolution.
  • Continued exploration of novel phage genomes is critical for future discoveries.
  • The evolutionary dynamics of phages are complex and ongoing.