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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Transposable bacteriophages are known to integrate their DNA into host genomes.
  • This integration involves replicative transposition and leads to genome reorganization.

Purpose of the Study:

  • To explore the role of transposable phages in horizontal gene transfer (HGT).
  • To investigate the prevalence of transposable phages in bacterial populations.

Main Methods:

  • Isolation and detection of transposable phages.
  • Sequence similarity searches in bacterial genomes.

Main Results:

  • Transposable phages integrate into host genomes, causing profound reorganization.
  • Conjugative elements can integrate or acquire chromosomal segments via phage transposition.
  • Increasing detection of transposable phages across diverse bacteria.

Conclusions:

  • Transposable phage-mediated HGT is a significant and potentially pervasive mechanism in nature.
  • The findings highlight the dynamic nature of bacterial genomes influenced by phage activity.