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Related Experiment Videos

The human lambda immunoglobulin enhancer is controlled by both positive elements and developmentally regulated

M A Glozak1, B B Blomberg

  • 1Department of Microbiology and Immunology, University of Miami School of Medicine, FL 33101, USA.

Molecular Immunology
|March 1, 1996
PubMed
Summary
This summary is machine-generated.

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Researchers identified the full boundaries of a human lambda enhancer, crucial for immunoglobulin light chain production. This enhancer shows developmentally regulated activity, with flanking sequences potentially inhibiting its function in certain cells.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The human lambda (λ) immunoglobulin light chain locus contains transcriptional enhancers that regulate gene expression.
  • Previous work localized an initial enhancer to a 1.2 kb fragment, with core activity in a 111 bp fragment, situated 11.7 kb downstream of the Cλ7 gene.

Purpose of the Study:

  • To precisely define the boundaries of the human lambda enhancer.
  • To investigate the regulatory elements influencing enhancer activity during B cell development.
  • To explore protein interactions at the human lambda enhancer locus.

Main Methods:

  • Chloramphenicol acetyl transferase (CAT) assays were employed to measure enhancer activity.
  • Deletion analysis was performed using various DNA fragment sizes.

Related Experiment Videos

  • In vivo footprinting was utilized to identify protein-DNA interactions.

    • Main Results:

    • The complete human lambda enhancer demonstrated two- to four-fold higher activity than the core fragment in pre-B and B cell lines.
    • A larger fragment, including flanking sequences, exhibited reduced activity in pre-B cells but retained full activity in B cells, suggesting negative regulatory elements.
    • In vivo footprinting identified shared and unique motifs between human and murine lambda enhancers, indicating conserved and specific protein interactions.

    Conclusions:

    • The human lambda enhancer's activity is modulated by flanking sequences, likely involving developmentally regulated negative elements.
    • These findings provide insights into the precise regulation of immunoglobulin light chain gene expression during lymphocyte development.
    • Comparative analysis of protein-binding motifs highlights conserved and divergent mechanisms in lambda enhancer function across species.