Restrictive usage of monoclonal immunoglobulin λ light chain germline in POEMS syndrome

Author:

Abe Daijiro1,Nakaseko Chiaki1,Takeuchi Masahiro1,Tanaka Hiroaki1,Ohwada Chikako1,Sakaida Emiko1,Takeda Yusuke1,Oda Kayo1,Ozawa Shinichi1,Shimizu Naomi1,Masuda Shinichi1,Cho Ryuko1,Nishimura Miki1,Misawa Sonoko2,Kuwabara Satoshi2,Saito Yasushi1

Affiliation:

1. Division of Hematology, Department of Clinical Cell Biology, and

2. Department of Neurology, Chiba University Graduate School of Medicine, Chiba, Japan

Abstract

Abstract POEMS syndrome is a rare plasma cell disorder characterized by peripheral neuropathy, monoclonal gammopathy, and high levels of serum vascular endothelial growth factor, the pathogenesis of which remains unclear. A unique feature of this syndrome is that the proliferating monoclonal plasma cells are essentially λ-restricted. Here we determined complete nucleotide sequences of monoclonal immunoglobulin λ light chain (IGL) variable regions in 11 patients with POEMS syndrome. The V-region of the Igλ gene of all 11 patients was restricted to the Vλ1 subfamily. Searching for homologies with IGL germlines revealed that 2 germlines, IGLV1-44*01 (9/11) and IGLV1-40*01 (2/10), were identified, with an average homology of 91.1%. The IGLJ3*02 gene was used in 11 of 11 re-arrangements with an average homology of 92.2%. These data suggest that the highly restricted use of IGL Vλ1 germlines plays an important role in the pathogenesis of POEMS syndrome.

Publisher

American Society of Hematology

Subject

Cell Biology,Hematology,Immunology,Biochemistry

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