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Intron 1 elements promote erythroid-specific GATA-1 gene expression.

D Seshasayee1, J N Geiger, P Gaines

  • 1Programs in Genetics and Department of Veterinary Science, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

The Journal of Biological Chemistry
|May 16, 2000
PubMed
Summary

Regulatory elements within intron 1 significantly impact GATA-1 gene transcription, particularly in erythroid cells. These elements, including GATA and Ap1 sites, are crucial for high-level gene expression.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Hematopoiesis

Background:

  • The zinc finger protein GATA-1 is essential for activating erythroid and megakaryocytic gene transcription.
  • Factors regulating the GATA-1 gene itself are not well understood.

Purpose of the Study:

  • To identify and characterize regulatory elements within intron 1 of the GATA-1 gene.
  • To investigate the role of these elements in erythroid-restricted GATA-1 transcription.

Main Methods:

  • Deletion analysis of a full-length GATA-1 gene construct (G6.8-Luc) in transiently transfected erythroid and myeloid cell lines.
  • Reporter gene assays using GATA and Ap1 consensus elements linked to reporter cassettes.
  • In vivo footprinting assays in erythroid cells.
  • Analysis of stably integrated GFP reporter constructs.

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Main Results:

  • A central subdomain of intron 1 markedly enhanced GATA-1 transcription (>10-fold) in erythroid cells, with minimal effect in myeloid cells.
  • Repeated GATA and Ap1 consensus elements within this subdomain drove high-level transcription in erythroid cells and were bound by GATA-1.
  • Deletion of intronic GATA or Ap1 motifs significantly reduced reporter gene activity, confirming their regulatory role.

Conclusions:

  • Intron 1 contains critical regulatory elements, including GATA and Ap1 binding sites, that drive erythroid-specific GATA-1 gene transcription.
  • These intronic elements are essential for achieving high levels of GATA-1 expression in erythroid lineages.
  • Differential utilization of GATA-1 exons (1a and 1b) also contributes to cell-type specific expression.