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This review explores the genetics of enterococci, focusing on mobile genetic elements, virulence, and antibiotic resistance. It covers DNA replication, gene regulation, and the mobilome, including plasmids and integrated conjugative elements (ICEs).

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Enterococci genetics research emphasizes mobile genetic elements, regulatory circuits, and antibiotic resistance genes.
  • Recent studies increasingly focus on virulence gene regulation in pathogenic *Enterococcus faecalis* and *Enterococcus faecium*.
  • Fundamental aspects of enterococcal DNA replication, partition, and division remain under-explored.

Purpose of the Study:

  • To provide a comprehensive overview of enterococcal genetics, with a focus on mobile genetic elements and gene regulation.
  • To discuss transcriptional and posttranscriptional mechanisms governing gene expression.
  • To cover emerging areas of interest in the enterococcal mobilome.

Main Methods:

  • Review of existing literature on enterococcal genetics, mobile genetic elements, and gene regulation.
  • Comparative analysis with better-studied model organisms for fundamental processes like DNA replication.
  • Detailed examination of specific genetic elements such as plasmids, integrated conjugative elements (ICEs), and pathogenicity islands.

Main Results:

  • Discussion of transcriptional and posttranscriptional gene regulation mechanisms.
  • In-depth coverage of pheromone-responsive conjugation plasmids, including their regulation and inheritance.
  • Focus on integrated conjugative elements (ICEs) and their role in enterococcal genetic exchange.
  • Exploration of emerging topics: non-pheromone plasmids, toxin-antitoxin systems, bacteriophages, and genome defense.

Conclusions:

  • The enterococcal mobilome is complex, involving various mobile genetic elements that contribute to adaptation and pathogenicity.
  • Understanding the regulation of these elements is crucial for addressing challenges posed by pathogenic enterococci, such as antibiotic resistance.
  • Further research into fundamental processes and emerging mobile elements will enhance our knowledge of enterococcal biology.