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Bacterial Phylum Chlamydiae01:29

Bacterial Phylum Chlamydiae

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The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
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Plasmids01:28

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Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
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Viral Replication: Lysogenic Cycle01:16

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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...
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Bacterial Phylum Tenericutes01:24

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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Viral Replication: Lytic Cycle01:20

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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...
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Diversity of Protists II

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Forward Genetic Approaches in Chlamydia trachomatis
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Plasmid-mediated virulence in Chlamydia.

Breanna J Turman1, Toni Darville1,2, Catherine M O'Connell2

  • 1Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, United States.

Frontiers in Cellular and Infection Microbiology
|September 4, 2023
PubMed
Summary

The conserved chlamydial plasmid enhances infection and inflammation, contributing to severe diseases like blindness and infertility. Understanding plasmid-encoded virulence factors is crucial for developing effective treatments against Chlamydia trachomatis.

Keywords:
Chlamydiabacterial pathogenesishost pathogen interactionsintracellular bacteriavirulence mechanismsvirulence plasmid

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Area of Science:

  • Microbiology
  • Immunology
  • Pathogenesis

Background:

  • Chlamydia trachomatis infections cause significant ocular and reproductive health issues, including blindness, infertility, and pelvic pain.
  • Inflammation at mucosal sites, driven by host immune responses to chlamydial infection, leads to disease sequelae.
  • The conserved chlamydial plasmid is increasingly recognized for its role in enhancing infection and inflammation.

Purpose of the Study:

  • To review the role of the chlamydial plasmid in disease development across different infection sites (genital, ocular, gastrointestinal).
  • To discuss the functions of plasmid-encoded proteins and their molecular mechanisms in chlamydial virulence.
  • To highlight knowledge gaps regarding plasmid-mediated pathogenesis in human infections.

Main Methods:

  • Review of existing studies on C. trachomatis and C. muridarum infections.
  • Analysis of data implicating the chlamydial plasmid in host cell entry, exit, and inflammatory responses.
  • Examination of evidence for plasmid-associated inflammation independent of bacterial burden.

Main Results:

  • The chlamydial plasmid, encoding virulence factors like Pgp3, Pgp4, and Pgp5, significantly enhances infection and innate inflammatory responses.
  • Plasmid-mediated virulence may extend beyond known factors, with potential tissue and species-specific variations.
  • Evidence suggests chlamydial plasmid-associated inflammation can occur independently of bacterial load.

Conclusions:

  • The chlamydial plasmid is a critical determinant of virulence, influencing infectivity and pathogenesis.
  • Further research is needed to fully elucidate the mechanisms of plasmid-mediated virulence and its impact on human infections.
  • Understanding these mechanisms could lead to improved strategies for combating chlamydial diseases.