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Characterization of the immunoglobulin light chain variable region gene expressed in multiple myeloma.

Abstract：

:We studied the organization, diversification and clinical significance of the immunoglobulin light chain (IgL) variable region genes expressed in 17 kappa-chain and 16 lambda-chain producing multiple myeloma (MM) samples. The V genes from 31 MM samples had over 84.9% homology to the known germline Vkappa/lambda genes, whereas one Vkappa and one Vlambda gene had only 75.5% and 65.9% homology, respectively. While all five Jkappa segments were equally used, only Jlambda-1 or Jlambda-2/3 was used among seven Jlambda segments. N nucleotide addition was found at two Vkappa-Jkappa and five Vlambda-Jlambda junctions. The lambda-chain complementarity determining region (CDR)-3 was longer and more variable than the kappa-chain CDR-3 mainly due to junctional flexibility of Vlambda and Jlambda segments. Somatic mutations were more frequent in the Jlambda than the Jkappa segments, and were distributed in the CDR-3 as well as the frame work region (FWR)-4. Those of the Jkappa segments, however, were limited to FWR-4. In FWR-4, replacement mutations were clustered at codon 106 of kappa-chain and 103 of lambda-chain. Thus nucleotide mutation or conservation was dependent on position, indicating a structural necessity of IgL for the development of myeloma cells in addition to a non-random distribution of mutations. There was no characteristic IgL sequence according to the isotype of M-protein, clinical stage or renal complication.

journal_name

Leukemia

journal_title

Leukemia

authors

Kiyoi H,Naito K,Ohno R,Saito H,Naoe T

doi

10.1038/sj.leu.2400972

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

601-9

issue

4

eissn

0887-6924

issn

1476-5551

journal_volume

12

pub_type

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