AI Networking Cookbook: Practical recipes for AI-assisted network automation and development
TL;DR
The regulatory functions of bacterial sRNAs are summarized, the molecular mechanisms that govern their expression and regulatory consequences are described, and the many exciting open questions surrounding sRNA-mediated gene regulation in bacteria are discussed.
Abstract Bacterial regulatory small RNAs (sRNAs) are integral components of posttranscriptional control, shaping environmental adaptation, metabolic homeostasis, and virulence. Advances in transcriptomics and RNA technologies have greatly expanded the repertoire of bacterial sRNAs and revealed their extensive roles in posttranscriptional regulatory networks. This review provides an updated framework for the biogenesis of bacterial sRNAs and their regulatory roles within posttranscriptional networks. Crucially, we describe the regulatory pathways controlling sRNA expression, including environmental signal sensing and regulation mediated by σ factors and transcription factors, to illustrate how sRNAs respond dynamically to changing conditions. Expanding beyond expression control, we further discuss the diverse roles of sRNA-mediated regulation in metabolic adaptation, stress responses, and bacterial virulence, emphasizing their importance in linking environmental changes to cellular phenotypes. Concurrently, we review current experimental and computational methods used for sRNA discovery and target identification. Overall, this review provides an integrated perspective on how bacterial sRNAs connect environmental sensing with adaptive cellular responses and highlights the broader significance of RNA-mediated regulation in bacterial physiology.
This review discusses six primary transcription-dependent regulatory mechanisms: transcription-dependent activation, chromatin remodeling, R-loop formation, transcriptional condensate formation, DNA looping, and transcriptional interference.
ABSTRACT RNA‐binding proteins (RBPs) are central regulators of post‑transcriptional gene expression, controlling RNA stability, localization, translation, and alternative splicing. Their functions arise not only from intrinsic RNA‐binding domains but also from dynamic interactions with noncoding RNAs, metabolites, cofactors, and other RBPs. Here, we summarize the structural diversity and core biological activities of canonical and noncanonical RBPs, and delineate how competitive and cooperative regulatory networks dictate RBP function in disease, with an emphasis on cancer. Competitive mechanisms, including lncRNA‐mediated sequestration, antagonistic crosstalk between miRNAs and RBPs, and competition among RBPs for shared substrates, can redirect RNA fate. In contrast, cooperative mechanisms assemble multimolecular ribonucleoprotein complexes that reinforce oncogenic or tumor‐suppressive programs. Dysregulation of these networks promotes proliferation, metastasis, immune evasion, and therapy resistance. We also review emerging therapeutic strategies that target RBP‐centered regulatory circuits, including antisense oligonucleotides, small molecules, protein degraders, and natural products, and we evaluate representative preclinical studies and clinical trials. By integrating mechanistic principles with translational evidence, this review provides a network‐based framework for exploiting RBPs as therapeutic vulnerabilities and for advancing next‐generation precision oncology.
Eukaryotic transcription is a highly dynamic and adaptable process that underpins the gene expression programs regulating development, cellular identity, and responses to extracellular signals. Gene-specific regulation of transcription across different cell types and environmental conditions is therefore fundamental to both normal physiology and disease. This specificity is shaped by phosphorylation of the RNA polymerase II (RNAPII) C-terminal domain (CTD) and its associated transcription factors. While cyclin-dependent kinases (CDKs) have long been recognized as the regulators of RNAPII activity, emerging evidence points to a broader, more diverse network of transcriptional kinases. Here, we highlight non-canonical transcriptional kinases that could operate alongside and beyond CDKs to modulate transcription by RNAPII. We discuss how these kinases could introduce context-specific CTD modifications that enable transcriptional plasticity, facilitate rapid loci-specific activation, and integrate signaling and stress-responsive pathways, ultimately adding a layer of regulatory complexity with profound implications for dynamic transcriptional regulation in development, homeostasis, and disease.
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