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BSAP can repress enhancer activity by targeting PU.1 function.

S Maitra1, M Atchison

  • 1Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Molecular and Cellular Biology
|February 25, 2000
PubMed
Summary
This summary is machine-generated.

The transcription factors BSAP and PU.1 have opposing roles in B-cell development. BSAP represses PU.1 activity, impacting B-cell differentiation and immunoglobulin gene regulation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • PU.1 and BSAP are critical transcription factors for B-cell development.
  • Absence of PU.1 leads to loss of B, T, and myeloid cells.
  • Absence of BSAP causes an early block in B-cell differentiation.

Purpose of the Study:

  • To investigate the regulatory relationship between BSAP and PU.1.
  • To elucidate the mechanisms by which these factors interact and influence B-cell development.
  • To understand their roles in regulating the immunoglobulin kappa chain 3' enhancer.

Main Methods:

  • Assays of enhancer activity in cell lines.
  • Analysis of transcription factor interactions and repression domains.
  • Investigating the role of coactivator p300 in modulating repression.

Main Results:

  • BSAP represses the activity of the immunoglobulin kappa chain 3' enhancer.
  • BSAP targets a specific region of the PU.1 transactivation domain for repression.
  • PU.1 can also inhibit BSAP transactivation, with partial reversal by p300.
  • BSAP represses PU.1 function via a distinct mechanism within the enhancer context, unaffected by p300.

Conclusions:

  • BSAP and PU.1 exhibit antagonistic activities crucial for hematopoietic development.
  • These interactions play a significant role in regulating B-cell differentiation and gene expression.
  • The findings provide insights into the complex regulatory networks governing immune cell development.