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: Satoshi Shiokawa, Takamitsu Matsushima, Ilseung Choi, Yasunobu Abe, Motoaki Shiratsuchi, Youko Suehiro, Koichiro Muta, Koichi Ohshima, Junji Nishimura
• Journal: British journal of haematology (Br J Haematol) Vol. 120 Issue 3 Pg. 492-5 (Feb 2003) ISSN: 0007-1048 [Print] England
• PMID: 12580967 (Publication Type: Case Reports, Journal Article)

Topics

• Aged
• B-Lymphocytes (immunology)
• Female
• Genes, Immunoglobulin
• Humans
• Immunoglobulin Class Switching (genetics)
• Lymphoma, Follicular (genetics, immunology)
• Mutation
• Neoplastic Stem Cells (immunology)