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VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
Published on: December 28, 2015
Kappa immunoglobulin light chain gene rearrangement in a T-lineage chronic lymphocytic leukemia
C T Lutz1, M E Galles, J D Kemp
1Department of Pathology, University of Iowa, Iowa City 52242.
Insights
This study found rearranged kappa immunoglobulin light chain genes in malignant T-lineage cells, challenging previous assumptions about B-cell specific gene rearrangement. Multiple tests are needed to accurately determine tumor cell lineage.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- Traditionally, kappa immunoglobulin light chain gene rearrangement was exclusively associated with B-lymphoid cells.
- Chronic lymphocytic leukemia (CLL) is a B-cell malignancy, making exceptions rare and significant.
Purpose of the Study:
- To investigate the lineage of malignant cells in a CLL patient exhibiting unusual genetic markers.
- To determine if kappa immunoglobulin light chain genes can rearrange in T-lineage cells.
Main Methods:
- Analysis of peripheral blood mononuclear cells from a CLL patient.
- Utilized immunophenotypic analysis with T-lymphocyte and B-lymphocyte specific antibodies.
- Conducted genotypic analysis of T-cell receptor beta-chain and immunoglobulin heavy chain genes.
Main Results:
- The majority of malignant cells displayed T-lineage markers, including rearranged T-cell receptor beta-chain genes and germline immunoglobulin heavy chain genes.
- Despite T-lineage markers, these cells also showed rearranged kappa immunoglobulin light chain genes.
- This indicates the first conclusive evidence of rearranged kappa genes in malignant T-lineage cells.
Conclusions:
- Gene rearrangement studies alone are insufficient for definitive tumor cell lineage determination.
- Accurate lineage identification requires evaluating multiple immunophenotypic and genotypic parameters.
- These findings highlight the importance of comprehensive analysis and offer models for studying lymphocyte receptor gene rearrangement in normal and malignant cells.
Abstract:
Until recently, only B-lineage lymphoid cells were observed to rearrange kappa immunoglobulin light chain genes. The authors examine peripheral blood mononuclear cells from a patient with chronic lymphocytic leukemia. More than 90% of these cells bound T-lymphocyte specific antibodies, failed to bind B-lymphocyte specific antibodies, had rearranged T-cell receptor beta-chain genes and had retained immunoglobulin heavy chain genes in the germline configuration. Despite these T-lineage markers, the majority of these cells had rearranged kappa immunoglobulin light chain genes. This provides the first conclusive evidence for rearranged kappa genes in malignant T-lineage cells and warns that gene rearrangement studies alone cannot indicate tumor cell lineage. To detect T-lineage cells that rearrange immunoglobulin genes, multiple immunophenotypic and genotypic parameters must be evaluated. These cells may provide important models to study how normal and malignant cells rearrange lymphocyte receptor genes.
