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DNA sequences regulating human beta globin gene expression.

K A Kosche, C Dobkin, A Bank

    Nucleic Acids Research
    |November 11, 1985
    PubMed
    Summary
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    Human delta and beta globin gene expression differs significantly. DNA analysis revealed that the large intervening sequence (IVS 2) of the delta globin gene reduces its expression compared to beta globin.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Gene Expression Regulation

    Background:

    • Human delta and beta globins show high homology but differ in expression levels in erythroid cells.
    • Delta globin expression is approximately 1-2% of beta globin expression.

    Purpose of the Study:

    • To identify the specific DNA sequences responsible for the differential expression of human delta and beta globin genes.
    • To investigate the role of intervening sequences (IVS) in regulating globin gene expression.

    Main Methods:

    • Construction of in vitro chimeric genes by fusing delta and beta globin gene segments.
    • Transfection and expression analysis of normal and chimeric globin genes in HeLa cells.

    Main Results:

    Related Experiment Videos

  • Replacing beta IVS 1 with delta IVS 1 did not alter gene expression compared to normal beta globin.
  • Replacing beta IVS 2 with delta IVS 2 significantly reduced chimeric gene expression.
  • Identified differential regulatory elements within IVS 2 of delta and beta globin genes.

    • Conclusions:

    • The large intervening sequence (IVS 2) of the delta globin gene contains elements that significantly reduce its expression relative to the beta globin gene.
    • Specific sequences within IVS 2 play a crucial role in modulating the expression levels of delta and beta globin genes.