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Related Experiment Videos

Subclass-specific nuclear localization of a novel CD4 silencer binding factor.

W W Kim1, G Siu

  • 1Department of Microbiology and the Integrated Program in Cellular, Molecular and Biophysical Studies, Columbia University College of Physicians and Surgeons, New York 10032, USA.

The Journal of Experimental Medicine
|August 4, 1999
PubMed
Summary

Researchers identified silencer-associated factor (SAF), a novel protein crucial for regulating CD4 gene expression during T lymphocyte development. Its location within cells dictates the silencer

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • CD4 expression control is vital for T lymphocyte development.
  • A previously identified cis-acting silencer element represses CD4 gene transcription.

Purpose of the Study:

  • To clone and characterize a novel factor binding to the CD4 silencer.
  • To investigate the role of this factor in CD4 gene regulation and T cell development.

Main Methods:

  • Cloning and characterization of the novel factor, silencer-associated factor (SAF).
  • Analysis of SAF's DNA-binding properties and sequence similarity to known transcriptional regulators.
  • Mutation analysis in the SAF binding site within the CD4 silencer in transgenic mice.
  • Immunofluorescence studies to determine SAF's subcellular localization in different T cell populations.

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Main Results:

  • A novel helix-turn-helix factor, silencer-associated factor (SAF), was identified and binds to the CD4 silencer.
  • Mutation of the SAF binding site abolished silencer activity in transgenic mice, confirming SAF's role.
  • SAF is expressed in all lymphocytes but shows differential subcellular localization: cytoplasmic in non-functional silencer T cells and nuclear in functional silencer T cells.

Conclusions:

  • SAF is a critical regulator of the CD4 silencer.
  • Subclass-specific subcellular compartmentalization of SAF is hypothesized to mediate the functional specificity of the CD4 silencer during T cell development.