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Related Concept Videos

Types of RNA01:23

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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 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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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 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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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Human Virome01:26

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The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible...
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Microbiota of the Respiratory Tract01:29

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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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Fecal micro RNA Isolation
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Circulating microbial RNA and health.

Ross Ka-Kit Leung1,2, Ying-Kit Wu1,2

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Blood RNA and microbial changes correlate with health status. Viral and bacterial RNA expression decreased with illness, while gut bacteria similarity increased post-LVAD, suggesting microbial shifts impact health.

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Area of Science:

  • Microbiology
  • Genomics
  • Human Physiology

Background:

  • Blood health indicators are crucial for diagnostics.
  • Microbial RNA species in blood may reflect host health status.
  • Integrative Personal Omics Profiling (iPOP) and Left Ventricular Assist Device (LVAD) studies offer unique insights.

Purpose of the Study:

  • To investigate the association between changes in health status and microbial RNA species.
  • To analyze microbial community shifts in response to LVAD implantation.
  • To explore the relationship between viral infections, blood glucose levels, and microbial gene expression.

Main Methods:

  • Analysis of RNA expression ratios (human to bacteria and viruses) in two distinct patient cohorts.
  • Comparative analysis of gut bacterial composition before and after LVAD implantation.
  • Temporal analysis of microbial gene expression during different phases of respiratory syncytial virus (RSV) infection and varying blood glucose levels.

Main Results:

  • A decrease in human-to-microbe RNA expression ratios correlated with deteriorated health conditions in both studies.
  • Significant increase in bacterial similarity among patients 180 days post-LVAD implantation.
  • Specific microbial gene enrichment (Enterobacteria phage PhiX 174, Escherichia coli) observed during RSV infection with normal blood glucose, potentially linked to host glucose regulation.

Conclusions:

  • Microbial RNA expression patterns serve as potential biomarkers for health status.
  • LVAD implantation induces significant shifts towards bacterial similarity in the gut microbiome.
  • Microbial activity, particularly involving specific bacteria and phages, may play a role in modulating host blood glucose levels.