Re-entry of tumour B cells into the cycle of somatic mutation and isotype switching in follicular lymphoma.
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.
Shiokawa
Satoshi
S
Division of Clinical Immunology, Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan. sahasu@tsurumi.beppu.kyushu-u.ac.jp
Matsushima
Takamitsu
T
Choi
Ilseung
I
Abe
Yasunobu
Y
Shiratsuchi
Motoaki
M
Suehiro
Youko
Y
Muta
Koichiro
K
Ohshima
Koichi
K
Nishimura
Junji
J
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