title: Re-entry of tumour B cells into the cycle of somatic mutation and isotype switching in follicular lymphoma.
abstract: Sequencing of the immunoglobulin (Ig) gene transcripts of the tumour B cells in lymph node (LN) and bone marrow (BM) from a follicular lymphoma (FL) patient associated with multiple myeloma identified two dominant clones. One of the clones, present in both LN and BM, had somatic mutations and extensive clonal diversity. Among the diversified clones, two dominant populations of identical sequences (group I and II) were present. Group II was a descendant population of group I and had nine more somatic mutations. Group I contained micro-, delta-, gamma- and alpha-expressing clones. Group II clones contained mainly micro- and delta-expressing clones. These findings showed that somatic mutation and isotype switching occurred repeatedly in this patient.
authors.affiliation: Division of Clinical Immunology, Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan. sahasu@tsurumi.beppu.kyushu-u.ac.jp
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shiokawa
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Matsushima
authors.forename: Ilseung
authors.initials: I
authors.lastname: Choi
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Abe
authors.forename: Motoaki
authors.initials: M
authors.lastname: Shiratsuchi
authors.forename: Youko
authors.initials: Y
authors.lastname: Suehiro
authors.forename: Koichiro
authors.initials: K
authors.lastname: Muta
authors.forename: Koichi
authors.initials: K
authors.lastname: Ohshima
authors.forename: Junji
authors.initials: J
authors.lastname: Nishimura
mesh_terms: D000368:Aged; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D005803:Genes, Immunoglobulin; D006801:Humans; D017578:Immunoglobulin Class Switching / Q000235:genetics*; D008224:Lymphoma, Follicular / Q000235:genetics* / Q000276:immunology; D009154:Mutation; D014411:Neoplastic Stem Cells / Q000276:immunology