Molecular Assessment of Clonality in Lymphoproliferative Disorders: I. Immunoglobulin Gene Rearrangements
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Updated: Aug 8, 2026
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
1Division of Molecular Diagnostics, University of Minnesota School of Medicine, Minneapolis, Minnesota, USA
Insights
Molecular genetic studies aid in diagnosing challenging non-Hodgkin lymphoma cases by detecting gene rearrangements. While clonality indicates malignancy, its absence doesn't rule it out, requiring careful interpretation with clinical data.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Non-Hodgkin lymphomas are diverse malignancies requiring histologic and immunophenotypic analysis.
- Molecular genetic studies are crucial for diagnosing challenging cases.
- Gene rearrangements establish clonality in B- and T-cell proliferations.
Purpose of the Study:
- To review the advantages and challenges of polymerase chain reaction (PCR) and Southern blot methods for detecting immunoglobulin gene rearrangements in B cells.
- To emphasize the importance of interpreting molecular test results within complete clinical and histologic context.
Main Methods:
- Histologic and immunophenotypic analyses.
- Molecular genetic studies, including PCR and Southern blot, for detecting immunoglobulin gene rearrangements.
- Analysis of T-cell receptor gene rearrangements.
Main Results:
- Clonality, indicated by unique gene rearrangements, is typically a hallmark of malignancy.
- Absence of detectable clonality does not exclude malignancy due to biological and technical factors.
- Various methods for molecular testing have increased as these tests become commonplace.
Conclusions:
- Molecular genetic testing is a key diagnostic tool for non-Hodgkin lymphomas.
- Interpreting molecular findings requires integration with comprehensive clinical and histologic information.
- Understanding the limitations and benefits of techniques like PCR and Southern blot is essential for accurate diagnosis.
Abstract:
The non-Hodgkins' lymphomas are a diverse group of malignancies with characteristic clinical and laboratory features. The routine evaluation of these lesions includes histologic and immunophenotypic analyses. In the small percentage of cases that pose diagnostic challenges, the algorithm can include molecular genetic studies to help render a diagnosis. Unique immunoglobulin heavy- and light-chain or T-cell-receptor gene rearrangements are used to establish clonality in B- and T-cell proliferations. Whereas clonality is usually a hallmark of a malignant process, the absence of clonality does not exclude malignancy. This is predicted on the disparate biology of the various lympho-proliferative processes and on the technical aspects of the tests used for their identification. As molecular genetic testing for gene rearrangements becomes commonplace in the clinical laboratory, the variety of methods for performing these tests has increased. Since molecular testing may be the deciding feature in making a diagnosis of malignancy, the purpose of this review is to discuss the advantages and problems of the polymerase chain reaction and Southern blot method in detecting immunoglobulin gene rearrangements in B cells. The added goal of this summary is to encourage the laboratorian to interpret these tests in the context of complete clinical and histologic data.
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