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Related Experiment Videos

Evolutionary relationship between plasmids and phages: phasmid P4 as a model

R Lagos1, R Goldstein

  • 1Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.

Archivos De Biologia Y Medicina Experimentales
|January 1, 1987
PubMed
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Phasmid P4 exhibits versatile propagation as a phage or plasmid. Its gene expression and copy number are modulated by growth conditions, enabling distinct biological roles.

Area of Science:

  • Bacteriology
  • Molecular Biology
  • Genetics

Background:

  • Phasmid P4 demonstrates remarkable adaptability, functioning as a temperate phage, a lytic helper-dependent phage, and a plasmid (pP4vir1).
  • The distinct propagation modes suggest differential gene expression strategies are employed.

Purpose of the Study:

  • To investigate the relationship between P4's propagation states and its gene expression levels.
  • To understand how cellular conditions influence plasmid copy number and gene expression.

Main Methods:

  • Analysis of P4 gene expression under different growth conditions.
  • Quantification of pP4vir1 copy number (n) in host cells.

Main Results:

  • P4 gene expression is significantly higher in the phage state compared to the plasmid state.

Related Experiment Videos

  • Alteration of growth conditions allows manipulation of pP4vir1 copy number from 1-2 to 30-40.
  • Low gene expression in plasmid mode facilitates intracellular persistence without disrupting host homeostasis.

    • Conclusions:

    • Phasmid P4 dynamically regulates gene expression and copy number to adapt to different propagation strategies.
    • The ability to maintain low gene expression as a plasmid is crucial for host compatibility.
    • These findings offer insights into the evolutionary flexibility of P4.