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Translocation remodeling in the primary BALB/c plasmacytoma TEPC 3610
A L Kovalchuk1, A Esa, A E Coleman
1Laboratory of Genetics, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
Genes, Chromosomes & Cancer
|February 15, 2001
Summary
Myc-activating translocations in plasmacytomas remodel through genetic recombination. This stepwise tumor progression event in TEPC 3610 suggests Myc break site location influences remodeling pressure.
Area of Science:
- Cancer Biology
- Genetics
- Molecular Oncology
Background:
- Inflammation-induced BALB/c plasmacytomas are characterized by Myc-activating chromosomal 12;15 translocations.
- These hallmark mutations undergo remodeling via genetic recombinations, removing immunoglobulin heavy-chain sequences near the Myc gene.
Purpose of the Study:
- To investigate the mechanism and stepwise nature of translocation remodeling in plasmacytoma.
- To correlate translocation remodeling with the location of the break site within the Myc gene.
Main Methods:
- Spectral Karyotyping (SKY) and Fluorescence In Situ Hybridization (FISH) for cytogenetic analysis.
- Long-range PCR and DNA sequencing to analyze key junction sites of the 12;15 translocation.
- Molecular analysis of six primary plasmacytomas.
Main Results:
- Translocation remodeling was identified as an infrequent, stepwise, and disomic tumor progression event in TEPC 3610.
- A hypothesis was developed predicting that the selective pressure for remodeling is influenced by the Myc break site location.
- Breaks 3' of the Myc promoter exert stronger selective pressure for remodeling than breaks 5' of the promoter.
Conclusions:
- Translocation remodeling is a significant event in plasmacytoma tumor progression.
- The location of the chromosomal break site relative to the Myc promoter is a critical determinant of remodeling.
- This finding offers insights into the genetic landscape of plasmacytoma development and potential therapeutic targets.