REPERTOIRE OF REARRANGED IMMUNOGLOBULIN HEAVY CHAIN GENES IN RUSSIAN PATIENTS WITH B-CELL LYMPHOPROLIFERATIVE DISEASES
Abstract: Introduction IGHV repertoire narrowing could be an evidence for the involvement of a limited set of antigens in the development of lymphomas. For CLL the existence of more than 200 subgroups of tumor IGHV antigen-binding sites, so called "stereotypical" antigen receptors (SAR) has been shown. For others lymphomas the possibility of SARs is also suggested. The aim of this study is to compare the tumor IGHVs and possible SARs in various B-cell malignancies in Russia and other countries. Materials and methods The study included samples of 1800 CLL patients, 52 patients with mantle cell lymphoma, 48 patients with hairy cell lymphoma and 37 patients with splenic marginal cell lymphoma. The nucleotide sequences of the IGHV genes were determined according to ERIC protocol. Results In CLL most common IGHV genes were IGHV1-69, IGHV1-2, IGHV3-30 and IGHV4-34. The most common SARs were CLL#1, CLL#6, CLL#2, CLL#3. In MCL the most common genes were IGHV4-34, IGHV3-21, IGHV3-23. In 5 MCL patients CDR3 sequences were identified matching definitions of a stereotyped. In the half of SMZL patients was identified gene IGHV1-2. Other IGHV genes were much less common. Two pairs of SMZL patients have motives similar to each other. In HCL IGHV repertoire was the most variable, no trends for antigen receptor stereotypy were observed. It was found that SARs are highly disease-specific both at the level of nucleotide and amino acid sequences. Conclusion Our results suggest that antigens crucial for the pathogenesis of B-cell malignancies could be disease-specific. Further studies on extended samples of non-CLL patients concerning the role of SARs in pathogenesis of these diseases may also contribute to the development of new diagnostic and prognostic markers. MICROABSTRACT The narrowing of the immunoglobulin heavy chain variable region (IGHV) gene repertoire is a feature of chronic lymphocytic leukemia (CLL) and several other B-cell malignancies. In this study we examined the IGHV gene sequences of 1937 patients with the most common B-cell lymphomas. We present a detailed comparison of B-cell receptor gene repertoires between CLL and other malignancies in patients from Russia and other populations.
Keywords: IGHV / stereotyped antigenic receptor / chronic lymphocytic leukemia / B-cell lymphomas
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