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Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation
09:02

Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation

Published on: November 26, 2018

Immunoglobulin light chain repertoire in chronic lymphocytic leukemia

Kostas Stamatopoulos1, Chrysoula Belessi, Anastasia Hadzidimitriou

  • 1Hematology Department and Hematopoietic Cell Transplantation (HCT) Unit, G. Papanicolaou Hospital, Thessaloniki, Greece. stavstam@otenet.gr

Blood
|August 4, 2005
PubMed

Insights

This study analyzed immunoglobulin light chain repertoires in chronic lymphocytic leukemia (CLL), identifying specific gene rearrangements and mutated sequences. Findings suggest antigen involvement in CLL pathogenesis through homologous complementarity-determining region 3 (CDR3) subsets.

Area of Science:

  • Immunology
  • Oncology
  • Genetics

Background:

  • Chronic lymphocytic leukemia (CLL) is characterized by the accumulation of malignant B cells.
  • The immunoglobulin (IG) light chain repertoire, including kappa (IGK) and lambda (IGL) chains, plays a crucial role in B cell function and antigen recognition.
  • Understanding IG repertoire biases in CLL can provide insights into disease pathogenesis.

Purpose of the Study:

  • To analyze the IGK and IGL light chain repertoires in a cohort of CLL cases.
  • To compare these repertoires with those of normal, autoreactive, and other neoplastic cells.
  • To identify specific IG gene rearrangements and complementarity-determining region 3 (CDR3) sequences associated with CLL.

Main Methods:

  • Analysis of IGK and IGL light chain gene rearrangements in 276 CLL cases.
  • Identification and comparison of frequently used IGKV and IGLV genes.
  • Assessment of sequence mutation status (similarity < 98%).
  • Identification of subsets with homologous CDR3 regions, including kappa CDR3 (KCDR3) and lambda CDR3 (LCDR3), and their association with specific IGHV heavy chains.

Main Results:

  • In 179 kappa-CLL cases, 21 functional IGKV genes were used, with IGKV3-20, IGKV1-39/1D-39, IGKV1-5, IGKV4-1, and IGKV2-30 being most frequent; 50.3% of IGK sequences were mutated.
  • In 97 lambda-CLL cases, 20 functional IGLV genes were used, with IGLV3-21, IGLV2-8, and IGLV2-14 being most frequent; 45.4% of IGL sequences were mutated.
  • Specific subsets of IGKV-J/IGLV-J and IGHV-D-J domains exhibiting homologous CDR3 were identified, suggesting potential antigen-driven selection.

Conclusions:

  • The study identified distinct IGK and IGL light chain repertoire features in CLL.
  • The presence of specific IG subsets with homologous CDR3 regions, associated with particular heavy chains, provides evidence for antigen's role in CLL pathogenesis.
  • These findings contribute to understanding the molecular mechanisms underlying CLL development.

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