title: IgH V-region sequence does not predict the survival fate of human germinal center B cells.
abstract: Germinal center (GC) B cell survival fate is governed in part by the outcome of successful/failed BCR-mediated interactions with accessory cells. However, the extent to which the BCR primary sequence influences such interactions is not fully understood. Over 1000 IgV(H)4 family cDNAs were sequenced from living (annexin V(-)) and apoptotic (annexin V(+) or from within tingible body macrophages) GC B cell fractions from seven tonsils. Results surprisingly demonstrate that living and dying GC B cells do not significantly differ in IgV(H), D, or J(H) gene segment use; HCDR3 length or positive charge; or mutation frequency. Additionally, equivalent IgH cDNA sequences were identified in both fractions, suggesting that BCR sequence alone is an unreliable predictor of GC B cell survival.
authors.affiliation: Molecular Immunogenetics, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA.
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Jackson
authors.forename: J Donald
authors.initials: JD
authors.lastname: Capra
mesh_terms: D017304:Annexin A5 / Q000096:biosynthesis; D017209:Apoptosis / Q000235:genetics / Q000276:immunology; D016175:B-Lymphocyte Subsets / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D002470:Cell Survival / Q000235:genetics / Q000276:immunology; D022801:Complementarity Determining Regions / Q000096:biosynthesis / Q000235:genetics; D005787:Gene Frequency; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D018858:Germinal Center / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D007074:Immunoglobulin G / Q000235:genetics; D007143:Immunoglobulin Heavy Chains / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D007133:Immunoglobulin Joining Region / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D010446:Peptide Fragments / Q000096:biosynthesis / Q000235:genetics; D010587:Phagocytosis / Q000235:genetics / Q000276:immunology; D011947:Receptors, Antigen, B-Cell / Q000378:metabolism; D017422:Sequence Analysis, DNA; D027041:Somatic Hypermutation, Immunoglobulin
chemical_list: D017304:Annexin A5; D022801:Complementarity Determining Regions; D007074:Immunoglobulin G; D007143:Immunoglobulin Heavy Chains; D007133:Immunoglobulin Joining Region; D007135:Immunoglobulin Variable Region; D010446:Peptide Fragments; D011947:Receptors, Antigen, B-Cell