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Related Concept Videos

Bacterial Phylum Chlamydiae01:29

Bacterial Phylum Chlamydiae

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 of...
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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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Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...

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Forward Genetic Approaches in Chlamydia trachomatis
09:03

Forward Genetic Approaches in Chlamydia trachomatis

Published on: October 23, 2013

Characterization of Chlamydia trachomatis plasmid-encoded open reading frames.

Siqi Gong1, Zhangsheng Yang, Lei Lei

  • 1Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.

Journal of Bacteriology
|June 25, 2013
PubMed
Summary

Chlamydia trachomatis research advanced with new plasmid shuttle vectors. Key plasmid genes were identified for maintenance and virulence, enabling new genetic tools for vaccine development.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Chlamydia trachomatis transformation was recently achieved, opening new avenues for research.
  • Chlamydial plasmid shuttle vectors are crucial tools for genetic manipulation.
  • Understanding plasmid gene function is essential for Chlamydia research.

Purpose of the Study:

  • To further dissect the roles of plasmid maintenance (pgp) genes and proteins in Chlamydia trachomatis.
  • To validate findings on plasmid gene function using the pGFP::SW2 vector system.
  • To explore the utility of chlamydial plasmids for expressing foreign genes and developing genetic tools.

Main Methods:

  • Transformation of plasmid-free C. trachomatis with shuttle vectors pGFP::SW2 and pBRCT.
  • Introduction of premature stop codons into pgp genes to assess protein and coding sequence requirements.
  • Deletion analysis of pgp genes to identify plasmid maintenance factors and regulatory elements.
  • Replacement of pgp coding regions with mCherry gene to test expression of non-chlamydial genes.

Main Results:

  • Pgp1, Pgp2, and Pgp6 proteins are necessary for plasmid maintenance, while the pgp8 coding sequence, not the protein, is required.
  • A minimum of 30 nucleotides in the pgp3 region is essential for pgp4 expression.
  • The pgp3, pgp4, or pgp5 coding regions can be replaced to express non-chlamydial genes, such as mCherry fluorescent protein.

Conclusions:

  • Chlamydial plasmid shuttle vectors are versatile genetic tools for studying Chlamydia biology and pathogenicity.
  • Specific pgp genes and their products play distinct roles in plasmid maintenance and gene regulation.
  • These findings facilitate the development of attenuated Chlamydia vaccines and novel genetic manipulation strategies.