Abstract:
:At the preB stage, when only the IGH locus has rearranged, mu chains become expressed in association with the psi L chains, lambda-like and VpreB, thus forming the preB receptor. By the use of a monoclonal anti VpreB antibody, preB cells were isolated from two adult bone marrow samples, and the VH repertoire was analyzed and compared to fetal, XLA (X-linked agammaglobulinemia), and adult B repertoires. Most VH genes identified were also expressed in fetal liver, XLA bone marrow, and adult PBLs, with similar predominant usage of certain germline genes. Multiple D/D fusions, limited N diversity, and preferential use of JH4 with a low level of DQ52 usage were also identified. Few mutations could be observed, not specifically localized in CDR regions, that could be interpreted as not positively selected. Conversely, a shorter length of CDR3 appeared to be the hallmark of the preB step. Thus, the association of psi L chains with mu does not bring about a bias in the VH gene usage, but a first selection on the CDR3 region could be the result of recognition by given autoantigens or ligands different for preB cells and B cells.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Tonnelle C,Cuisinier AM,Gauthier L,Guelpa-Fonlupt V,Milili M,Schiff C,Fougereau Mdoi
10.1111/j.1749-6632.1995.tb55833.xsubject
Has Abstractpub_date
1995-09-29 00:00:00pages
231-41eissn
0077-8923issn
1749-6632journal_volume
764pub_type
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