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Cis-regulatory Sequences02:02

Cis-regulatory Sequences

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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
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TSLP promotes GATA3-expressing effector regulatory T cells via DC2 derived from transitional DCs.

Marine Guivarch1, Pierre Meyer1, Antoine Braud1,2

  • 1Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), CNRS UMR 7104 - INSERM U 1258 - Strasbourg University, Illkirch, France.

Nature Immunology
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Thymic stromal lymphopoietin (TSLP) promotes regulatory T cell generation in melanoma via dendritic cells (DCs). This study identifies a specific DC subset driving immunosuppression, offering new therapeutic targets for cancer and inflammation.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Dendritic Cell Biology

Background:

  • Thymic stromal lymphopoietin (TSLP) is known to drive type 2 helper T cell responses.
  • TSLP's role in regulatory T cell (Treg) generation, particularly in skin cancer, is less understood.
  • Regulatory T cells play a critical role in immune suppression within the tumor microenvironment.

Purpose of the Study:

  • To investigate the mechanism by which TSLP influences regulatory T cell populations in cutaneous melanoma.
  • To identify the specific dendritic cell (DC) subset involved in TSLP-mediated Treg induction.
  • To characterize the molecular requirements for TSLP-driven Treg generation.

Main Methods:

  • Utilized a mouse model with inducible TSLP expression in epidermal keratinocytes.
  • Employed genetic tools and lineage tracing to track DC populations and Treg development.
  • Conducted transcriptomic analysis, surface marker profiling, and functional assays to identify and characterize DCs.

Main Results:

  • TSLP induces the generation and accumulation of GATA3-expressing effector regulatory T (eTreg) cells.
  • This process is mediated by a specific migratory DC population expressing the co-stimulatory molecule OX40L.
  • Identified transitional dendritic cell-derived DC2 as the key DC subset involved in promoting GATA3+ eTreg cells.

Conclusions:

  • TSLP promotes immunosuppression in cutaneous melanoma by driving GATA3+ eTreg cells via a specific DC subset (DC2).
  • This pathway highlights a previously unrecognized tolerogenic axis.
  • The findings suggest potential conserved mechanisms in humans relevant to cancer and inflammation.