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Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
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Identification of a Distal Enhancer That Regulates TGF-β-Induced SNAI1 Expression.

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  • 1Department of Biochemistry, Graduate School of Medicine, University of Yamanashi, Chuo, Japan.

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|May 14, 2025
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Summary

Researchers discovered a new DNA enhancer that controls the expression of SNAI1, a key gene in epithelial-mesenchymal transition (EMT). This enhancer is crucial for transforming growth factor-beta (TGF-β)-induced EMT, impacting cell motility.

Keywords:
EMTSmadTGF‐βenhancersnail

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Snail (encoded by SNAI1) is a transcription factor regulating epithelial-mesenchymal transition (EMT).
  • Snail expression is influenced by extracellular signals like transforming growth factor-beta (TGF-β), which acts via Smad3.
  • Understanding SNAI1 regulation is key to deciphering EMT.

Purpose of the Study:

  • To identify and characterize regulatory elements controlling TGF-β-induced SNAI1 expression.
  • To elucidate the role of a distal enhancer in TGF-β-mediated EMT.
  • To investigate the cooperative function of enhancers and promoters in gene regulation.

Main Methods:

  • Chromatin immunoprecipitation sequencing (ChIP-seq) and Hi-C analyses to map enhancer-promoter interactions.
  • CRISPR interference (CRISPRi) to inhibit enhancer activity.
  • Analysis of Smad-binding (CAGA) and activator protein-1 (AP-1) motifs.
  • Assessment of gene expression, stress fiber formation, and cell motility.

Main Results:

  • A distal enhancer, located 46 kb downstream of SNAI1, was identified.
  • This enhancer interacts with the SNAI1 promoter in TGF-β-stimulated cells and binds Smad3.
  • Inhibiting the enhancer reduced TGF-β-induced SNAI1 expression, stress fiber formation, and cell motility.
  • The enhancer contains functional Smad and AP-1 binding sites; RREB1 affects basal but not induced enhancer activity.

Conclusions:

  • A distal enhancer plays a critical role in mediating TGF-β-induced SNAI1 expression and EMT.
  • The enhancer and proximal promoter integrate distinct signaling inputs to regulate SNAI1.
  • This distal enhancer is a key component in the TGF-β signaling pathway driving EMT.