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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Transcriptional Regulation: Riboswitches01:23

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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Types of RNA01:20

Types of RNA

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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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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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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Functional RNAs control T follicular helper cells.

Shingo Ichimiya1, Ryuta Kamekura1,2, Koji Kawata1

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MicroRNAs (miRNAs) are key regulators of T follicular helper (Tfh) cells, influencing their development and function in health and disease. Understanding these noncoding RNAs offers insights into Tfh cell roles in immunity and various disorders.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • T follicular helper (Tfh) cells are crucial CD4+ T cell effectors regulating antibody production.
  • BCL6 is a key regulator in Tfh cells, implicated in autoimmune diseases, allergies, and cancers.
  • MicroRNAs (miRNAs) are emerging as critical regulators of Tfh cell development, differentiation, and plasticity.

Purpose of the Study:

  • To review and discuss recent findings on miRNAs governing Tfh cell function.
  • To explore the relationship between miRNAs, Tfh cells, and disease pathogenesis.
  • To highlight the significance of functional noncoding RNAs in Tfh cell biology.

Main Methods:

  • Literature review of recent studies on miRNAs and Tfh cells.
  • Analysis of the role of miRNAs in Tfh cell differentiation and plasticity.
  • Discussion of the implications of miRNA regulation in Tfh cell-related diseases.

Main Results:

  • miRNAs play cardinal roles in regulating Tfh cell development, differentiation, and plasticity.
  • Tfh cells are involved in the pathogenesis of autoimmune diseases, allergies, and cancers.
  • Functional noncoding RNAs provide a new perspective on Tfh cell biology.

Conclusions:

  • miRNAs are essential regulators of Tfh cell function and are implicated in various diseases.
  • Further research into RNA-mediated genetic programs will elucidate Tfh cell roles in unexplained pathophysiological conditions.
  • Understanding miRNA-Tfh cell interactions is vital for advancing CD4+ T cell biology and disease treatment.