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Updated: Jul 8, 2026

Forward Genetic Approaches in Chlamydia trachomatis
09:03

Forward Genetic Approaches in Chlamydia trachomatis

Published on: October 24, 2013

Three temporal classes of gene expression during the Chlamydia trachomatis developmental cycle.

E I Shaw1, C A Dooley, E R Fischer

  • 1Host-Parasite Interactions Section, Laboratory of Intracellular Parasites, Hamilton, MT 59840, USA.

Molecular Microbiology
|September 6, 2000
PubMed
Summary

Chlamydia trachomatis gene expression occurs in three temporal classes: early, mid-cycle, and late, correlating with its developmental cycle from elementary bodies (EB) to reticulate bodies (RB) and back to EBs.

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Live-Cell Forward Genetic Approach to Identify and Isolate Developmental Mutants in Chlamydia trachomatis

Published on: June 10, 2020

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Chlamydia trachomatis exhibits a unique biphasic developmental cycle with distinct elementary bodies (EB) and reticulate bodies (RB) forms.
  • Understanding the temporal gene expression is crucial for deciphering the mechanisms governing this developmental cycle.

Purpose of the Study:

  • To characterize the temporal gene expression patterns of Chlamydia trachomatis throughout its developmental cycle.
  • To correlate gene transcription with specific developmental stages (EB to RB differentiation, RB replication, RB to EB differentiation).

Main Methods:

  • Quantitative-competitive polymerase chain reaction (QC-PCR) and reverse transcription (RT)-PCR were employed.
  • Total RNA was harvested at 2, 6, 12, and 20 hours post-infection.
  • Analysis focused on genes involved in essential pathways and developmental transitions.

Main Results:

  • Three distinct temporal classes of gene expression were identified: early (by 2h), mid-cycle (6-12h), and late (12-20h).
  • Early genes are involved in macromolecular synthesis and inclusion membrane modification.
  • Mid-cycle genes, including metabolic enzymes and structural proteins, coincide with RB binary fission, while late genes facilitate RB to EB differentiation.

Conclusions:

  • Chlamydial gene expression is tightly regulated in a temporal manner, aligning with its developmental cycle.
  • Early gene functions support initial host cell invasion and niche establishment.
  • Late gene expression is critical for the formation of infectious elementary bodies for transmission.