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Analysis of the expressed immunoglobulin variable region heavy chain gene products in paraproteins from Iranian patients with multiple myeloma.
The frequency of expression of immunoglobulin (Ig) variable region heavy (VH ) chain gene products was studied in 43 Iranian patients with mutiple myeloma (MM). The expressed VH gene families and associated cross-reactive idiotypes (CRI) were analysed by immunoblotting and ELISA, using peptide-induced polyclonal antibodies specific for VH 1-VH 6 gene families and monoclonal antibodies (MAb) recognising CRI linked to theVH 1, VH 3, VH 4 and VH 6 gene families. The results revealed that the VH 3 family (60. 5%) was the most predominant gene family. In contrast, no paraproteins were encoded by genes from the VH 2 gene family and only 2.3% were encoded by the VH 5 family. The panel of paraproteins tested rarely expressed the probed VH -associated CRI. Our results suggest that: 1-The Ig VH genes, may not be randomly expressed in the malignant plasma cells from Iranian patients with MM. 2- Some of the genes seem to be negatively selected or highly mutated, as evidenced by the lack of expression of the probed CRI.
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