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Low rate of somatic hypermutations characterize progressive B-cell lymphomas
R Rosenquist1, A Lindström, A H Li
1Department of Pathology, University of Umeå, Sweden. ridrot95@student.umu.se
European Journal of Haematology
|September 30, 1998
Summary
Investigating immunoglobulin heavy (IgH) gene rearrangements in B-cell lymphomas revealed alterations in some cases during tumor progression. These changes, often somatic hypermutations, suggest potential antigen selection in specific lymphoma subtypes.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- B-cell lymphomas are cancers originating from immune cells.
- Understanding genetic changes during lymphoma progression is crucial for treatment and prognosis.
Purpose of the Study:
- To analyze immunoglobulin heavy (IgH) gene rearrangements in B-cell lymphomas over time.
- To identify genetic alterations associated with tumor progression and relapse.
Main Methods:
- Polymerase chain reaction (PCR) amplification of IgH gene rearrangements.
- Single strand conformation polymorphism (SSCP) analysis of variable heavy (VH) gene segments.
- Nucleotide sequence analysis of identified mutations.
Main Results:
- Alterations in IgH rearrangements were observed in 6 out of 15 patients at relapse.
- Mutations, likely somatic hypermutations, were found, with one case showing extensive mutation rates.
- Antigen-driven selection was suggested in one case, while others showed random mutation patterns.
- Some relapsed tumors had altered rearrangements not detectable by standard PCR, indicating mutations in specific gene regions.
Conclusions:
- B-cell lymphoma clones can exhibit genetic instability during progression, particularly in follicular or transformed subtypes.
- While some clones show antigen selection, many remain stable, making them suitable for minimal residual disease detection using VH gene markers.