Detection and Characterization of αβ-T-Cell Clonality by Denaturing Gradient Gel Electrophoresis (DGGE)

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Abstract
Accumulation of T cells carrying identical T-cell receptors (TCR) is associated with a number of immunological and nonimmunological diseases. Therefore, it is of interest to be able to analyze complex T-cell populations for the presence of clonally expanded subpopulations. Here, we describe a simple method combining reverse transcription (RT)-PCR and denaturing gradient gel electrophoresis (DGGE) for rapid detection and characterization of T-cell clonality. The detection of clonally expanded T cells by DGGE relies on the fact that clonal transcripts have no junctional diversity and therefore resolve at a fixed position in the gel, which is determined by their melting properties. For polyclonal populations with a high degree of junctional diversity, the different DNA molecules will resolve at different positions in the gel and together will be revealed as a smear. For each of the TCR β-variable gene (BV)1–24 families, cloned transcripts were amplified and shown to resolve as distinct bands in the denaturin...

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