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Related Experiment Videos

Rearranged NFKB-2 genes in lymphoid neoplasms code for constitutively active nuclear transactivators

C C Chang1, J Zhang, L Lombardi

  • 1Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.

Molecular and Cellular Biology
|September 1, 1995
PubMed
Summary

Chromosomal rearrangements in the NFKB-2 gene create abnormal proteins that are constitutively active. These altered NF-kappa B transcription factors may drive lymphomagenesis by constantly activating target genes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • The NFKB-2 gene encodes a transcription factor involved in the NF-kappa B pathway.
  • Chromosomal rearrangements at the NFKB-2 locus are observed in lymphoid neoplasms.
  • These rearrangements affect the ankyrin-encoding domain, producing truncated or fused proteins.

Purpose of the Study:

  • To investigate the functional consequences of NFKB-2 gene alterations.
  • To analyze the subcellular localization, DNA binding, and transcriptional activity of tumor-associated NFKB-2 mutants.

Main Methods:

  • Transfection of expression vectors for NFKB-2 mutants (p85, lyt-10C alpha).
  • Immunofluorescence studies for subcellular localization.
  • UV-cross-linking and immunoprecipitation for DNA binding analysis.

Related Experiment Videos

  • Reporter gene assays to assess transcriptional activity.

    • Main Results:

    • Mutant NFKB-2 proteins (p85, lyt-10C alpha) localize constitutively to the nucleus.
    • p85 binds kappa B sites, and both mutants retain transcriptional activation via heterodimerization.
    • Mutants lost transrepression activity but gained independent transactivation of NF-kappa B reporter genes.
    • Bcl-3 did not further stimulate the transactivation activity of the mutants.

    Conclusions:

    • Aberrant NFKB-2 proteins contribute to lymphomagenesis through constitutive activation of the NF-kappa B system.
    • These mutants may drive oncogenesis by persistently activating NFKB-2 target genes.
    • Understanding these alterations provides insight into lymphoid neoplasm development.