Abstract：
:Recent work suggests that chronic lymphocytic leukemia (B-CLL) expressing unmutated immunoglobulin V genes could correspond to the proliferation of naive B cells whereas those expressing mutated genes, may correspond to the proliferation of post-germinal center B cells. Current data from gene profiling expression have failed to demonstrate a clear-cut distinction between these two forms of B-CLL disease. In the present study, we have investigated the complete V(H) nucleotide sequence and the presence of RNA transcripts from different C(H) domains in 25 B-CLL patients. Our results demonstrate that: (1) expression of IgD is not related to the mutational frequency and activation of the isotype switch pathway; (2) isotype switch, leading to simultaneous expression at the transcriptional and protein level of IgM, IgD, IgG and IgA, occurs in a small percentage of patients, and (3) different mechanisms such as VDJ duplication and trans-splicing or RNA splicing of long nuclear transcript, could be involved in isotype switch. Our results highlight the difficulty in assigning a normal counterpart to B-CLL cells and raise the possibility that a different B cell development pathway, independent from classical germinal centers, might exist in B-CLL.
journal_name
Leukemiajournal_title
Leukemiaauthors
Oppezzo P,Magnac C,Bianchi S,Vuillier F,Tiscornia A,Dumas G,Payelle-Brogard B,Ajchenbaum-Cymbalista F,Dighiero G,Pritsch Odoi
10.1038/sj.leu.2402731subject
Has Abstractpub_date
2002-12-01 00:00:00pages
2438-46issue
12eissn
0887-6924issn
1476-5551journal_volume
16pub_type
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