title: Amplified and rearranged bcl-2 gene in two lymphoma cell lines, FL-218 and FL-318, carrying a 14;18 translocation.
abstract: Two human B-cell lines carrying a 14;18 chromosome translocation [t(14;18)(q32;q21)], designated FL-218 and FL-318, were established from effusion cells of two Japanese patients manifesting the transformed histology of follicular lymphoma. The FL-218 and FL-318 cell lines were composed of cells in the hyperdiploid range, which had two and three or four 18q- chromosomes, respectively. These 18q- chromosomes were not distinguishable from an 18q- chromosome derived from t(14;18) since they exhibited the same banding pattern. Southern blot analysis revealed that in both cell lines, breakage of the bcl-2 gene occurred within the major breakpoint cluster region and the truncated gene juxtaposed to an immunoglobulin heavy chain gene locus. The autoradiographic intensity of the retained fragment each on 18q- chromosome was more enhanced than that of the translocated fragment on 14q+ chromosome. These findings suggest that the extra 18q- chromosome found in t(14;18)-positive cancer does not arise from de novo independent t(14;18) but from duplication of a preexisting 18q- chromosome.
authors.affiliation: Department of Internal Medicine, Faculty of Medicine, Kyoto University, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Amakawa
authors.forename: S
authors.initials: S
authors.lastname: Fukuhara
authors.forename: H
authors.initials: H
authors.lastname: Ohno
authors.forename: S
authors.initials: S
authors.lastname: Tanabe
authors.forename: M
authors.initials: M
authors.lastname: Horii
authors.forename: F
authors.initials: F
authors.lastname: Matsuyama
authors.forename: I
authors.initials: I
authors.lastname: Kato
authors.forename: T
authors.initials: T
authors.lastname: Kakita
authors.forename: O
authors.initials: O
authors.lastname: Nagauchi
mesh_terms: D000368:Aged; D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D002460:Cell Line; D002871:Chromosome Banding; D002883:Chromosomes, Human, Pair 14; D002887:Chromosomes, Human, Pair 18; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D005784:Gene Amplification; D015321:Gene Rearrangement; D006801:Humans; D007621:Karyotyping; D008223:Lymphoma / Q000235:genetics*; D011505:Protein-Tyrosine Kinases / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D019253:Proto-Oncogene Proteins c-bcl-2; D011519:Proto-Oncogenes; D015183:Restriction Mapping; D014178:Translocation, Genetic
chemical_list: D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D004273:DNA, Neoplasm; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D011505:Protein-Tyrosine Kinases