title: Molecular cloning of a novel 11q23 breakpoint associated with non-Hodgkin's lymphoma.
abstract: Chromosomal analysis of a non-Hodgkin's lymphoma revealed a t(11;14)(q23;q32) translocation amongst other abnormalities. To investigate the molecular basis of this translocation, a cosmid library was constructed from the tumour DNA and the rearranged IGH locus was isolated in a single cosmid. Fluorescence in situ hybridization confirmed that the cloned region contained sequences from chromosome 11q23 fused to chromosome 14q32. Sequence analysis identified the breakpoint as a fusion between a region from the switch segment of the C gamma 4 gene of the IGH locus and an unknown sequence on chromosome 11. The chromosome 11 sequence maps proximal to the CD3 gene cluster and is therefore distinct from both the HTRX1 gene (rearranged in acute leukaemias) and the RCK gene (rearranged in a cell line derived from a histiocytic B-cell lymphoma). This newly identified region contains a cluster of rare cutting restriction enzyme sites located within 200 bases of the breakpoint, suggestive of a CpG island. Although this t(11;14)(q23;q32) translocation and that in the RC-K8 cell line affect different regions on chromosome 11, the breakpoints on chromosome 14 were found to have occurred at equivalent positions of S gamma 2 and S gamma 4 segments.
authors.affiliation: Department of Medical Oncology, St Bartholomew's Hospital, London, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Meerabux
authors.forename: F E
authors.initials: FE
authors.lastname: Cotter
authors.forename: L
authors.initials: L
authors.lastname: Kearney
authors.forename: D
authors.initials: D
authors.lastname: Nizetic
authors.forename: S
authors.initials: S
authors.lastname: Dhut
authors.forename: B
authors.initials: B
authors.lastname: Gibbons
authors.forename: T A
authors.initials: TA
authors.lastname: Lister
authors.forename: B D
authors.initials: BD
authors.lastname: Young
mesh_terms: D000328:Adult; D001483:Base Sequence; D002874:Chromosome Mapping; D002880:Chromosomes, Human, Pair 11; D002883:Chromosomes, Human, Pair 14; D003001:Cloning, Molecular; D004247:DNA; D004268:DNA-Binding Proteins / Q000235:genetics; D011495:Histone-Lysine N-Methyltransferase; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics*; D008297:Male; D008969:Molecular Sequence Data; D051788:Myeloid-Lymphoid Leukemia Protein; D011519:Proto-Oncogenes; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors; D014178:Translocation, Genetic
chemical_list: D004268:DNA-Binding Proteins; C497422:KMT2A protein, human; D014157:Transcription Factors; D051788:Myeloid-Lymphoid Leukemia Protein; D004247:DNA; D011495:Histone-Lysine N-Methyltransferase