The IGHV1-69/IGHJ3 recombinations of unmutated CLL are distinct from those of normal B cells

Forconi, Francesco, Potter, Kathleen N., Sozzi, Elisa, Henderson, Isla, Cencini, Emanuele, Rossi, Davide, Bomben, Riccardo, Gattei, Valter, Gaidano, Gianluca, Packham, Graham and Stevenson, Freda K. (2012) The IGHV1-69/IGHJ3 recombinations of unmutated CLL are distinct from those of normal B cells. Blood, 119 (9), 2106-2109. (doi:10.1182/blood-2011-08-375501). (PMID:22234701)

Abstract

IGHV1-69/51p1 is expressed by ? 30% of unmutated chronic lymphocytic leukemia (U-CLL) and combines with selected IGHD and IGHJ genes generating stereotypes if HCDR3 amino acid homology is > 60%. We had previously revealed stereotypic IGHV1-69/IGHJ6 rearrangements in normal naive B cells, thereby identifying potential counterparts of U-CLL. A different stereotypic IGHV1-69/IGHD3-16(RF2)/IGHJ3 rearrangement carrying the CAR(GGx)YD motif in the N1-region, recurrent in 6% IGHV1-69+ve CLL, is exceptionally sequence restricted, strongly suggestive of shared antigen recognition. We have now analyzed IGHV1-69/IGHJ3 rearrangements in circulating B cells of healthy individuals using several PCR-based approaches with IGHV1-69/IGHJ3 CLL sequences for reference. Stereotypes were found, but all were distinct from CLL. Remarkably, even a highly sensitive semi-nested PCR, specific for the CLL-expressed IGHV1-69/IGHD3-16(RF2)/IGHJ3 stereotype, failed to identify the CAR(GGx)YD sequence, although similar motifs were found. These highly specific B cells are not apparent in the accessible normal repertoire and may expand in response to rarely expressed antigens important in the pathogenesis of CLL.

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Contributors

Author: Francesco Forconi

Author: Graham Packham

Author: Freda K. Stevenson

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