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Related Experiment Videos

The notch pathway intermediate HES-1 silences CD4 gene expression

H K Kim1, G Siu

  • 1Department of Microbiology, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.

Molecular and Cellular Biology
|November 20, 1998
PubMed
Summary

The lin-12/Notch pathway regulates T-cell development. Hairy/Enhancer of Split homologue 1 (HES-1) binds the CD4 silencer, repressing CD4 gene expression and impacting T-cell fate.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • A transcriptional silencer is crucial for CD4 gene expression during T-cell development.
  • The lin-12/Notch signaling pathway plays a role in T-cell development.

Purpose of the Study:

  • To investigate the role of Hairy/Enhancer of Split homologue 1 (HES-1) in CD4 gene regulation.
  • To elucidate the involvement of the lin-12/Notch signaling pathway in T-cell development via CD4 gene control.

Main Methods:

  • Identifying transcription factor binding sites within the CD4 silencer.
  • Overexpression studies of HES-1 and activated Notch1 (NotchIC) in T-cells.
  • Assessing the impact on CD4 promoter and enhancer function, and endogenous CD4 expression.

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Main Results:

  • HES-1 binds to a functional site in the CD4 silencer, repressing CD4 gene expression.
  • Overexpression of HES-1 downregulates CD4 expression in CD4(+) CD8(-) T helper cells.
  • NotchIC represses CD4 gene expression independently of the HES-1 binding site, suggesting multiple pathway-responsive factors.

Conclusions:

  • The lin-12/Notch signaling pathway is critical for thymic T-cell development.
  • HES-1 acts as a molecular link between lin-12/Notch signaling and CD4 gene expression control.
  • This pathway influences T-cell developmental fate through the regulation of CD4 gene expression.