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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Related Experiment Video

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In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells
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E2A-regulated epigenetic landscape promotes memory CD8 T cell differentiation.

David M Schauder1,2, Jian Shen1,2, Yao Chen1,2

  • 1Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI 53226.

Proceedings of the National Academy of Sciences of the United States of America
|April 16, 2021
PubMed
Summary
This summary is machine-generated.

CD8 T cell differentiation into effector or memory cells is governed by two transcriptional circuits. E2A acts as a key epigenetic regulator, promoting memory cell formation and survival.

Keywords:
CD8 T cellLCMVT cell memoryepigeneticsscRNA-seq

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Area of Science:

  • Immunology
  • Molecular Biology
  • Epigenetics

Background:

  • CD8 T cells differentiate into effector or memory cells after viral infections.
  • The precise mechanisms governing this cell fate decision remain unclear.

Purpose of the Study:

  • To investigate the transcriptional regulation of CD8 T cell differentiation.
  • To identify key regulators of effector versus memory cell fate.

Main Methods:

  • Single-cell transcriptome-derived gene regulatory network analysis.
  • Chromatin accessibility studies at enhancers.
  • Analysis of E2A transcription factor function.

Main Results:

  • Identified two main regulon groups controlling CD8 T cell differentiation.
  • Discovered that memory precursor cells retain enhancer accessibility for memory genes, enriched for E2A sites.
  • Demonstrated E2A directly regulates memory gene enhancers, promoting memory cell formation.

Conclusions:

  • CD8 T cell differentiation is controlled by two distinct transcriptional circuits.
  • E2A is a crucial epigenetic regulator promoting memory CD8 T cell development.