Comparative Transcriptomics Reveals Genes Commonly Induced by Distinct Stressors in Chlamydia

Area of Science:

• Microbiology
• Bacterial Pathogenesis
• Transcriptomics

Background:

• *Chlamydia trachomatis* causes urogenital infections with potential long-term complications.
• *C. trachomatis* exhibits a biphasic developmental cycle and can enter a persistent state under stress.
• Understanding stress-specific transcriptomic reprogramming is crucial for defining chlamydial adaptation.

Purpose of the Study:

• To comparatively analyze transcriptomic reprogramming in *C. trachomatis* under diverse stress conditions.
• To identify stress-specific transcriptional signatures and overlaps.
• To explore potential vulnerabilities for disrupting chlamydial persistence.

Main Methods:

• Comparative reanalysis of five *C. trachomatis* RNA-Seq datasets.
• Analysis of transcriptomes under interferon-γ, tryptophan starvation, iron starvation, penicillin, and heat shock.
• Global transcriptomic profiling and comparison.

Main Results:

• Heat shock induced a distinct transcriptome compared to chronic stresses.
• Chronic stresses (tryptophan/iron starvation) showed significant transcriptomic similarity, potentially mediated by YtgR.
• Interferon-γ induced a unique but partially overlapping transcriptome.

Conclusions:

• *C. trachomatis* employs distinct transcriptomic reprogramming strategies for different stressors.
• Shared transcriptional features are stressor-dependent, with chronic stresses showing more overlap.
• Identifying conserved stress response functions may offer targets to disrupt chlamydial persistence.