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Related Experiment Videos

Multiple control elements are required for expression of the human CD34 gene

H S Radomska1, A B Satterthwaite, T C Burn

  • 1Hematology/Oncology Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.

Gene
|November 30, 1998
PubMed
Summary

Proper regulation of the CD34 gene in stem cells requires multiple cis regulatory elements working together. These elements, including a 3' enhancer and intron 4 regions, are essential for controlling CD34 expression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Gene Regulation

Background:

  • The human CD34 gene is crucial for hematopoietic stem cell function.
  • Previous studies identified a promoter and a 3' enhancer for the CD34 gene.
  • The 3' enhancer showed cell-type specificity in CD34+ cell lines.

Purpose of the Study:

  • To delineate the core enhancer sequence of the CD34 gene.
  • To investigate the role of cis regulatory elements in CD34 gene expression upon stable integration.
  • To identify additional control elements regulating CD34 expression in stem cells.

Main Methods:

  • Deletion and transient transfection assays to define the core enhancer.
  • DNaseI hypersensitivity and methylation studies to analyze chromatin structure.

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  • Stable transfection and transgenic animal models to assess regulatory element function.

    • Main Results:

    • The core enhancer sequence was delineated, but it was insufficient for cell-type specific expression alone upon stable integration.
    • A CD34+ cell type-specific hypersensitive site was identified in intron 4.
    • Neither the 3' enhancer nor the intron 4 region functioned as a locus control region independently.
    • A large genomic fragment containing the entire CD34 gene demonstrated sufficient regulatory elements for high-level expression.

    Conclusions:

    • Multiple proximal and long-range cis regulatory elements cooperate to ensure proper CD34 gene expression.
    • Combinatorial action of these elements is critical for regulating CD34 in stem cells.
    • The identified regulatory regions contribute to the complex control of CD34 gene expression.