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Pubmed ID :3122215
Publication Date : //

Structure of a third murine immunoglobulin lambda light chain variable region that is expressed in laboratory mice.


Recently, we reported evidence for the existence of an immunoglobulin lambda light chain (lambda x) whose variable region differs from those encoded by the known V lambda gene segments V lambda 1 and V lambda 2. Expression of lambda x was detected in some hybridomas elicited by treatment of a BALB/c mouse with rabbit anti-lambda 2 antibodies coupled to bacterial lipopolysaccharide [Sanchez, P. & Cazenave, P.-A. (1987) J. Exp. Med. 166, 265-270]. We constructed a cDNA clone from one hybridoma (B6) that expresses the lambda x chain and determined the complete nucleotide sequence. The deduced amino acid sequence of V lambda x is 30-33% identical with those encoded by V lambda 1 and V lambda 2 and by V kappa gene segments. The third hypervariable region of V lambda x is four codons longer than those of the other murine variable gene segments. The expression of lambda x requires a genomic rearrangement that juxtaposes the V lambda x gene with the J lambda 2-C lambda 2 joining-constant gene pair. Rabbit anti-V lambda x antibodies detected the lambda x light chain in the normal sera of all laboratory mice tested. Lambda x expression seems to be independent of lambda 1 expression, since both SJL and SJA strains, which are defective in lambda 1 production, express normal levels of lambda x chain.

Authors : Sanchez P , Marche P N , Le Guern C , Cazenave P A ,

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