Regulatory RNA Mechanisms in Bacterial Systems and Pathogenesis

Bacterial regulatory RNAs, notably small non-coding RNAs (sRNAs) and riboswitches, orchestrate gene expression at the post-transcriptional level. These molecules interact with target mRNAs to modulate translation initiation, mRNA stability and decay, often in concert with RNA-binding proteins such as Hfq, ProQ and CsrA. In many pathogens, regulatory RNAs shape virulence programmes by fine-tuning the expression of toxins, secretion systems and stress-response pathways. Antisense RNAs and RNA thermometers sense environmental cues, while CRISPR RNAs contribute to immunity against phages. Mixed network motifs combining transcription factors and sRNAs provide rapid, dynamic control, enabling bacteria to adapt to host defences and antibiotic pressure. Understanding these layers of control reveals new targets for antimicrobial intervention and offers tools for synthetic biology, including programmable sRNA knockdown platforms and predictive algorithms for target identification.

Research from Nature Portfolio

A broad-host-range synthetic sRNA platform has been developed to achieve targeted gene knockdown across diverse bacterial species. By employing a conserved sRNA scaffold and a heterologous Hfq chaperone, this system silences virulence factors in clinically relevant pathogens and redirects metabolic fluxes for biotechnological production. In parallel, a global analysis of the post-transcriptional regulator CsrA in Escherichia coli has mapped its in vivo RNA interactome and quantified its impact on translation, RNA abundance and stability. This study reveals novel CsrA targets involved in cell envelope integrity and iron homeostasis, underscoring its central role in coordinating bacterial lifestyle transitions.

Regulatory RNA Mechanisms in Bacterial Systems and Pathogenesis publication trend

The graph below shows the total number of articles in regulatory rna mechanisms in bacterial systems and pathogenesis across all publications each year (not limited to Nature Index journals).

Technical terms

Small regulatory RNA (sRNA): Short non-coding RNA molecule that modulates gene expression post-transcriptionally by base-pairing with target mRNAs.

RNA chaperone: Protein such as Hfq or ProQ that facilitates correct folding and interactions between RNAs.

CsrA: RNA-binding protein that regulates translation initiation and mRNA stability by binding to untranslated regions.

Ribonuclease E (RNase E): Endonuclease that initiates decay and processing of bacterial RNAs, often guided by regulatory RNAs.

5′ untranslated region (5′ UTR): Non-coding segment upstream of the coding sequence that influences translation and stability of mRNA.

References

1. Targeted and high-throughput gene knockdown in diverse bacteria using synthetic sRNAs. Nature Communications (2023).
2. TargetRNA3: predicting prokaryotic RNA regulatory targets with machine learning. Genome Biology (2023).
3. Small RNAs, Large Networks: Posttranscriptional Regulons in Gram-Negative Bacteria. Annual Review of Microbiology (2023).
4. Improved RNA stability estimation through Bayesian modeling reveals most Salmonella transcripts have subminute half-lives. Proceedings of the National Academy of Sciences of the United States of America (2024).
5. Global role of the bacterial post-transcriptional regulator CsrA revealed by integrated transcriptomics. Nature Communications (2017).