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Published on: November 2, 2018
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.
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.
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.
- 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.
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