Similarities and differences between the light and heavy chain Ig variable region gene repertoires in chronic lymphocytic leukemia

Fabio Ghiotto, Franco Fais, Emilia Albesiano, Cristina Sison, Angelo Valetto, Gianluca Gaidano, Janine Reinhardt, Jonathan E. Kolitz, Kanti Rai, Steven L. Allen, Manlio Ferrarini, Nicholas Chiorazzi

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Abstract

Analyses of Ig VHDJH rearrangements expressed by B-CLL cells have provided insights into the antigen receptor repertoire of B-CLL cells and the maturation stages of B-lymphocytes that give rise to this disease. However, less information is available about the L chain V gene segments utilized by B-CLL cells and to what extent their characteristics resemble those of the H chain. We analyzed the VL and JL gene segments of 206 B-CLL patients, paying particular attention to frequency of use and association, mutation status, and LCDR3 characteristics. Approximately 40% of B-CLL cases express VL genes that differ significantly from their germline counterparts. Certain genes were virtually always mutated and others virtually never. In addition, preferential pairing of specific V L and JL segments was found. These findings are reminiscent of the expressed VH repertoire in B-CLL. However unlike the V H repertoire, VL gene use was not significantly different than that of normal B-lymphocytes. In addition, Vκ genes that lie more upstream on the germline locus were less frequently mutated than those at the 3′ end of the locus; this was not the case for Vλ genes and is not for VH genes. These similarities and differences between the IgH and IgL V gene repertoires expressed in B-CLL suggest some novel features while also reinforcing concepts derived from studies of the IgH repertoire.

Original languageEnglish
Pages (from-to)300-308
Number of pages9
JournalMolecular medicine (Cambridge, Mass.)
Volume12
Issue number11-12
DOIs
Publication statusPublished - Nov 2006

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ASJC Scopus subject areas

  • Genetics

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Ghiotto, F., Fais, F., Albesiano, E., Sison, C., Valetto, A., Gaidano, G., Reinhardt, J., Kolitz, J. E., Rai, K., Allen, S. L., Ferrarini, M., & Chiorazzi, N. (2006). Similarities and differences between the light and heavy chain Ig variable region gene repertoires in chronic lymphocytic leukemia. Molecular medicine (Cambridge, Mass.), 12(11-12), 300-308. https://doi.org/10.2119/2006-00080.Ghiotto