title: Third complementarity determining region sequence analysis of low-grade bronchus-associated lymphoid tissue lymphoma: genotypic analysis reveals heterogeneity in maturation.
abstract: It has recently been suggested that autoimmunity may play a role in the pathogenesis of low-grade mucosa-associated lymphoid tissue lymphomas, but precise genotypic analysis of antigen binding sites of low-grade bronchus-associated lymphoid tissue (BALT) lymphomas has not been reported. We analyzed the third complementarity determining region (CDR3) in eight cases of low-grade BALT lymphoma by 2-step PCR and sequencing analysis. All cases showed a distinct monoclonal band (about 100 base pairs) on electrophoresis. In seven cases, a single major CDR3 sequence was identified with five to nine clones among 10 vector clones being identical; and in the remaining case, two major sequences were obtained, with four clones among nine vector clones being identical. Findings suggestive of the autoimmunity of low-grade BALT lymphoma were obtained: (1) VHDJH rearrangements in seven of the eight lymphoma cell clones were potentially functional; (2) genotypically, two lymphoma cell clones showed 60 to 74% homology with G6 positive lymphocyte clones; and (3) five lymphoma cell clones showed 61 to 71 % homology with lymphocyte clones derived from fetal liver or cord blood. In one case, the N-D-N length of the neoplastic clone was very short and lacked N nucleotides at the D-JH junction. Therefore, our study demonstrates genotypic heterogeneity in maturation in low-grade BALT lymphoma.
authors.affiliation: First Department of Pathology, School of Medicine, Chiba University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kurosu
authors.forename: N
authors.initials: N
authors.lastname: Yumoto
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.forename: T
authors.initials: T
authors.lastname: Kuriyama
authors.forename: A
authors.initials: A
authors.lastname: Mikata
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015551:Autoimmunity; D001483:Base Sequence; D002999:Clone Cells; D017931:DNA Primers / Q000235:genetics; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D005838:Genotype; D006801:Humans; D007135:Immunoglobulin Variable Region / Q000235:genetics*; D008175:Lung Neoplasms / Q000235:genetics / Q000276:immunology / Q000473:pathology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm; D007135:Immunoglobulin Variable Region