Chemiluminescent detection of clonal immunoglobulin and T cell receptor gene rearrangements in Tunisian lymphoid malignancies, leukemias and lymphomas.

Clonal rearrangement of antigen receptor genes is commonly used to characterize the lymphoproliferative diseases. In order to perform molecular characterization in the diagnostics and monitoring of lymphoid malignancies, leukemias and lymphomas in Tunisia, we have introduced the use of chemiluminescent probes for immunoglobulin (IG) and T cell receptor (TR) gene rearrangement detection employing the Southern blot method. The chemiluminescent and radioactive detection methods tested with alkaline phosphatase and 32P labelled probes, respectively, were used for the IG and TR gene rearrangement characterization. Our results show the same pattern of rearrangement. Moreover, the chemiluminescent signal is detected faster and it is as sensitive as the radioactive one. We report the optimized conditions for using IGH, IGK, IGL, TRB and TRG probes in non radioactive detection. We have applied the chemiluminescent Southern blot method to analyze examples of Tunisian leukemias and lymphomas. The results allowed the assessment of clonality and the T or B cell lineage of these cases. The use of non radioactive probes makes chemiluminescent Southern blot detection reliable, safe and sensitive. As the use of radioactivity is not common in our laboratories and the licensing requirements needed for its use prohibitive, the chemiluminescent technique will be of great help for detection and characterization of molecular markers in lymphoid malignancies in Tunisia.