title: New type of t(14;18) in a non-Hodgkin's lymphoma provides insight in molecular events in early B-cell differentiation.
abstract: In this report a follicular non-Hodgkin's lymphoma (NHL) carrying an unusual t(14;18) is described. This translocation most likely occurred during the VH to D-JH rearrangement process of the IgH locus. From the data combined with data from the literature we conclude that the chance for development of a t(14;18) decreases during progression of the immunoglobulin rearrangement process in the pre-B-cell ontogeny. This is probably due to decreased accessibility of the bcl-2 locus by reduced transcription. We analysed the somatic mutation pattern of the productively rearranged IgH gene. Like other follicular lymphomas, somatic mutations were present in this gene and indicated positive selection, probably for an antigen. We found no evidence for ongoing induction of somatic mutations during lymphoma development. We conclude that bcl-2 gene deregulation, but not the precise moment at which this occurs during the pre-B-cell stage, influences the development of follicular NHL.
authors.affiliation: Department of Medicine, University Hospital St Radboud Nijmegen, The Netherlands.
authors.forename: J P
authors.initials: JP
authors.lastname: Meijerink
authors.forename: J M
authors.initials: JM
authors.lastname: Raemaekers
authors.forename: E J
authors.initials: EJ
authors.lastname: Mensink
mesh_terms: D000328:Adult; D001402:B-Lymphocytes / Q000502:physiology*; D001483:Base Sequence; D002454:Cell Differentiation; D002883:Chromosomes, Human, Pair 14; D002887:Chromosomes, Human, Pair 18; D015321:Gene Rearrangement; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics* / Q000473:pathology; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D016133:Polymerase Chain Reaction; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D019253:Proto-Oncogene Proteins c-bcl-2; D014178:Translocation, Genetic
chemical_list: D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2