Euo is Essential for Transcriptional Priming of Chlamydia trachomatis Elementary Bodies to Facilitate Secondary Infection.
The phylum Chlamydiota comprises obligate intracellular bacteria characterized by a highly conserved, biphasic developmental cycle. This cycle involves the transition between the infectious, metabolically quiescent elementary body (EB) and the non-infectious, replicative reticulate body (RB). While the morphological transitions of the developmental cycle are well-documented, the regulatory…
Chlamydiota is a phylum of obligate intracellular bacteria that undergo a biphasic developmental cycle, transitioning between infectious elementary bodies (EBs) and non-infectious reticulate bodies (RBs). The mechanisms regulating these phenotypic shifts are not well understood. Euo, a conserved helix-loop-helix transcription factor, is a candidate for this regulation, potentially repressing late-cycle genes and preventing premature differentiation.
Researchers used CRISPR interference (CRISPRi) to knockdown euo expression in Chlamydia trachomatis to study its role in developmental regulation. Surprisingly, euo knockdown did not significantly impact the primary developmental cycle, including RB replication, intermediate body formation, and late-gene expression kinetics. However, there was a notable decrease in infectious progeny production.
Analysis showed that while EBs were still formed and could enter host cells post-knockdown, they had dysregulated gene expression during the germination phase of a new infection cycle, preventing the establishment of a productive secondary infection. These findings imply that Euo is crucial for EB programming, ensuring transcriptional competence in re-infection of host cells.
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