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Published on: August 9, 2019
Pseudo-spikes are common in histologically benign lymphoid tissues
1Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
The Journal of Molecular Diagnostics : JMD
|March 7, 2001
Summary
Capillary gel electrophoresis enhances T cell receptor gamma (TCR-gamma) gene rearrangement analysis for diagnosing T cell lymphomas. Careful interpretation is needed as benign tissues can show pseudo-spikes, distinct from true clonal malignant populations.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- T cell receptor gene rearrangement is a key marker for T cell clonality.
- Polymerase chain reaction (PCR) and polyacrylamide gel electrophoresis are traditional methods for analysis.
- Capillary gel electrophoresis (CGE) offers improved resolution and sensitivity for TCR-gamma gene rearrangement.
Purpose of the Study:
- To re-define normal variation of TCR-gamma gene rearrangement in benign tissues.
- To establish criteria for distinguishing true clonal populations from pseudo-spikes using CGE.
- To improve diagnostic accuracy for T cell lymphomas and leukemias.
Main Methods:
- DNA capillary gel electrophoresis was used to analyze TCR-gamma gene rearrangement.
- Benign T-cell-rich tissues (spleen, lymph node, tonsil, blood) and T cell lymphoma samples were examined.
- Relative peak heights (h1/h2) were defined and analyzed to differentiate patterns.
Main Results:
- Pseudo-spikes (relative peak height 0.5-1.5) were observed in approximately 20% of benign samples.
- T cell lymphoma samples consistently showed higher relative peak heights (≥2 or ≥3).
- A relative peak height of at least 3 suggests a true clonal population.
Conclusions:
- CGE is a sensitive method for assessing T cell clonality.
- Pseudo-spikes in benign tissues can mimic clonal populations, requiring careful interpretation.
- Established criteria for peak heights aid in differentiating benign variations from malignant T cell clonality.
