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Plasmid diversity in Chlamydia

N S Thomas1, M Lusher2, C C Storey2

  • 1Molecular Microbiology, University of Southampton Medical School, Southampton General Hospital, Southampton S016 6YD, UK.

Microbiology (Reading, England)
|June 1, 1997
PubMed
Summary
This summary is machine-generated.

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Chlamydial plasmids show significant sequence conservation (>60%) and a consistent genomic structure across diverse species. The only major variation found was a deletion in an equine Chlamydia pneumoniae plasmid, impacting ORF 1.

Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Chlamydiae species display low interspecies DNA homology.
  • Plasmids from different chlamydial species are distinguishable.
  • Chlamydia trachomatis plasmids from human isolates are highly conserved.

Purpose of the Study:

  • To evaluate the nature and extent of plasmid variation within Chlamydiae.
  • To determine the complete nucleotide sequences of novel plasmids from diverse non-human chlamydial isolates.

Main Methods:

  • Complete nucleotide sequencing of plasmids from avian Chlamydia psittaci (pCpA1), equine Chlamydia pneumoniae (pCpnE1), and C. trachomatis mouse pneumonitis (pMoPn).
  • Comparative sequence analysis of determined plasmid genomes.
  • Restriction enzyme profiling and Southern blot analysis were used previously to distinguish plasmids.

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Main Results:

  • Considerable sequence conservation (>60%) and a consistent genomic arrangement (eight major ORFs, four 22 bp tandem repeats) were observed across the analyzed chlamydial plasmids.
  • Plasmids were approximately 7500 nucleotides in length, with the equine C. pneumoniae plasmid (pCpnE1) being smaller (7362 bp) due to a large deletion within ORF 1.
  • The deletion in pCpnE1 potentially creates two smaller ORFs, representing the only significant variation identified among the studied chlamydial plasmids.

Conclusions:

  • Chlamydial plasmids exhibit remarkable sequence and genomic structure conservation despite low interspecies DNA homology.
  • A deletion within ORF 1 of the equine C. pneumoniae plasmid is the primary variation identified, with potential implications for future research.
  • The consistent plasmid structure suggests potential roles in chlamydial biology, and the identified variation could be significant for developing novel chlamydial vectors.