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DNA Bacteriophages01:26

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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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Following Cell-fate in E. coli After Infection by Phage Lambda
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Published on: October 14, 2011

Bacteriophage evolution given spatial constraint.

Stephen T Abedon1, Rachel R Culler

  • 1Department of Microbiology, The Ohio State University, Mansfield, OH 44906, USA. abedon.1@osu.edu

Journal of Theoretical Biology
|June 15, 2007
PubMed
Summary

Understanding bacteriophage (phage) plaque formation is key, as spatial structure impacts phage propagation. This study analyzes how phage growth parameters like latent period and burst size influence plaque wavefront velocity, offering insights into evolutionary responses.

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Published on: June 11, 2015

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Biophysics

Background:

  • Spatial structure, common in environments like biofilms, can hinder microbial processes.
  • Bacteriophage (phage) plaquing in agar gels is a standard laboratory technique.
  • Phage plaque size is used to measure phage fitness, but plaque formation dynamics are not fully understood.

Purpose of the Study:

  • To analyze the impact of phage growth parameters on plaque wavefront velocity.
  • To investigate how latent period, burst size, and adsorption rate affect plaque expansion rates.
  • To understand evolutionary selection for rapid phage propagation in structured environments.

Main Methods:

  • Analysis of published equations predicting phage plaque enlargement rates.
  • Modeling the influence of phage growth parameters (latent period, burst size, adsorption rate) on wavefront velocity.
  • Examination of environmental factors like bacterial density and virion diffusion.

Main Results:

  • Increased wavefront velocity is generally associated with shorter latent periods, larger burst sizes, and faster adsorption rates.
  • Deviations from these trends can occur based on specific parameter values and bacterial densities.
  • Faster virion diffusion consistently increases plaque wavefront velocity.

Conclusions:

  • Phage growth parameters significantly influence plaque expansion rates in spatially structured environments.
  • Evolutionary selection may favor phages with optimized growth parameters for faster propagation.
  • This research provides a framework for understanding phage adaptation in complex microbial communities.