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Types of RNA01:23

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Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Types of RNA01:20

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Translational Regulation01:29

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Outer Membrane Vesicles From Bacteroides fragilis Contain Coding and Non-Coding Small RNA Species That Modulate

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  • 1Department of Biology Baylor University Waco USA.

Journal of Extracellular Biology
|October 23, 2025
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Outer membrane vesicles (OMVs) from Bacteroides fragilis carry small RNAs (sRNAs) that modulate host immune responses. RNAs on pathogenic ETBF OMVs suppress IL-8, while their removal enhances immune stimulation.

Keywords:
Bacteroides fragilisouter membrane vesiclessmall RNA

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Area of Science:

  • Microbiology
  • Immunology
  • Molecular Biology

Background:

  • Microbiome alterations impact host physiology and immunity.
  • Microbe-derived RNAs within outer membrane vesicles (OMVs) may influence host immune responses.
  • The specific role of OMV-associated small RNAs (sRNAs) from different bacterial strains in immunity is largely unknown.

Purpose of the Study:

  • To investigate the role of OMVs and their associated sRNAs from pathogenic (ETBF) and commensal (NTBF) Bacteroides fragilis in modulating intestinal epithelial cell immune responses.
  • To characterize differences in sRNA profiles between ETBF and NTBF OMVs and their impact on Toll-like receptor (TLR) activation and cytokine production.

Main Methods:

  • RNA sequencing (RNA-seq), qRT-PCR, and northern blotting to analyze sRNA content of OMVs.
  • Reporter cell assays to assess TLR activation (TLRs 2, 3, and 7) upon OMV treatment.
  • Treatment of intestinal epithelial cell lines (Caco-2, HT29-MTX) with OMVs and analysis of IL-8 expression.

Main Results:

  • Distinct sRNA profiles were identified in OMVs from ETBF and NTBF, with specific RNAs enriched in ETBF OMVs.
  • OMVs activated TLRs 2, 3, and 7 and increased IL-8 expression in intestinal epithelial cells.
  • Degradation of RNAs on ETBF OMVs, but not NTBF OMVs, enhanced IL-8 stimulation, indicating an immunosuppressive role for extravesicular RNAs.

Conclusions:

  • Bacteroides fragilis OMVs carry sRNAs that differentially modulate host immune responses.
  • Extravesicular RNAs on pathogenic ETBF OMVs exert an immunosuppressive effect on intestinal epithelial cells.
  • OMV-associated RNAs have a dual role in host-microbe interactions, with potential implications for pathogenesis and therapeutics.