title: Evidence that amyloidogenic light chains undergo antigen-driven selection.
abstract: AL amyloidosis is characterized by fibrillar tissue deposits (amyloid) composed of monoclonal light chains secreted by small numbers of indolent bone marrow plasma cells whose ontogenesis is unknown. To address this issue and to provide insights into the processes that accompanied pathogenic light chain formation, we isolated the complete variable (V) regions of 14 light (VL) and 3 heavy (VH) chains secreted by amyloid clones at diagnosis (10 Bence Jones and 4 with complete Igs, 9 lambda and 5 kappa) by using an inverse polymerase chain reaction-based approach free of primer-induced biases. Amyloid V regions were found to be highly mutated compared with the closest germline genes in the databases or those isolated from the patients' DNA, and mutations were not associated with intraclonal diversification. Apparently high usage of the lambdaIII family germline gene V lambdaIII.1 was observed (4 of 9 lambda light chains). Analysis of the nature and distribution of somatic mutations in amyloid V regions showed that there was statistical evidence of antigen selection in 8 of 14 clones (7 in VL and 1 in VH). These results indicate that a substantial proportion of the amyloid clones developed from B cells selected for improved antigen binding properties and that pathogenic light chains show evidence of this selection.
authors.affiliation: Research Laboratories of Biotechnology and Organ Transplantation, Clinical Immunology Unit, Department of Internal Medicine, Pavia, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Perfetti
authors.forename: P
authors.initials: P
authors.lastname: Ubbiali
authors.forename: M C
authors.initials: MC
authors.lastname: Vignarelli
authors.forename: M
authors.initials: M
authors.lastname: Diegoli
authors.forename: R
authors.initials: R
authors.lastname: Fasani
authors.forename: M
authors.initials: M
authors.lastname: Stoppini
authors.forename: A
authors.initials: A
authors.lastname: Lisa
authors.forename: P
authors.initials: P
authors.lastname: Mangione
authors.forename: L
authors.initials: L
authors.lastname: Obici
authors.forename: E
authors.initials: E
authors.lastname: Arbustini
authors.forename: G
authors.initials: G
authors.lastname: Merlini
mesh_terms: D000368:Aged; D000595:Amino Acid Sequence; D000686:Amyloidosis / Q000276:immunology*; D000941:Antigens / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D001483:Base Sequence; D005803:Genes, Immunoglobulin; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics* / Q000276:immunology*; D007147:Immunoglobulin Light Chains / Q000235:genetics* / Q000276:immunology*; D007135:Immunoglobulin Variable Region / Q000235:genetics* / Q000276:immunology*; D008875:Middle Aged; D008969:Molecular Sequence Data; D009154:Mutation
chemical_list: D000941:Antigens; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D007135:Immunoglobulin Variable Region