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Forward Genetic Approaches in Chlamydia trachomatis

Forward Genetic Approaches in Chlamydia trachomatis

Published on: October 23, 2013

Deep sequencing-based discovery of the Chlamydia trachomatis transcriptome.

Marco Albrecht¹, Cynthia M Sharma, Richard Reinhardt

¹University of Würzburg, Biocentre, Department of Microbiology, Am Hubland, D-97074 Würzburg, Germany.

Nucleic Acids Research

|November 20, 2009

Summary

Researchers mapped the transcriptional start sites of Chlamydia trachomatis, revealing differences in gene expression between elementary bodies (EB) and reticulate bodies (RB). This study identified novel non-coding RNAs, including ctrR0332, crucial for the bacterium's life cycle.

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Area of Science:

Microbiology
Genomics
Transcriptomics

Background:

Chlamydia trachomatis is an obligate intracellular pathogen with limited genetic manipulation tools.
Despite genome sequencing, detailed gene structure and regulation remain poorly understood.

Purpose of the Study:

To define the transcriptome of Chlamydia trachomatis L2b elementary bodies (EB) and reticulate bodies (RB).
To map transcriptional start sites (TSS) and identify novel non-coding RNAs.

Main Methods:

Deep sequencing (RNA-seq) was employed to analyze RNA from purified EB and RB.
Transcriptional start sites (TSS) were mapped, and RNA levels were quantified.

Main Results:

363 TSS for annotated genes were mapped.
Differential RNA levels were observed for 84 genes between EB and RB.
42 novel genome-derived and 1 plasmid-derived non-coding RNAs were identified.
The non-coding RNA ctrR0332 was highly and differentially expressed in EB and RB.

Conclusions:

This study provides an unprecedented high-resolution map of TSS for Chlamydia trachomatis.
The findings offer insights into gene organization, control, and function in this important pathogen.
Identified non-coding RNAs, like ctrR0332, likely play significant roles in the C. trachomatis developmental cycle.