Abstract: |
We have analyzed the structure of Ig κ chain genes in B cell lines derived from a hiinan individual who cannot synthesize any κ chains, and whose Igs all contain λ chains (1). We have characterized secondary DNA recombination events at two κ alleles which have undergone misaligned V-J recombinations. One such secondary recombination has joined the flanking sequences of a Vκ and a Jκ2 gene segment as if it were the reciprocal product of a V-Jκ2 recombination, and resulted in the displacement of the recombined VJκ1 gene segments from the Cκ locus. The non-rearranged form of the Vκ fragment which had recombined with the Jκ2 flank was cloned. Nucleotide sequencing of this fragment identified a Vκ gene that differed by at least 38% from all previously sequenced human Vκ genes. The other V-Jκ segment analyzed has undergone a secondary recombination at a different site from that described above, at a site within the intervening sequence between the Jκ and Cκ gene segments, similar to the location of secondary recombinations which have occurred in λ + B cell lines from mice and humans (2, 3). These results prove that multiple recoiiibinations can occur at one Jκ-Cκ locus. © 1985 IRL Press Limited. |
Keywords: |
genetics; cell line; b lymphocyte; b-lymphocytes; molecular cloning; cloning, molecular; blood; genetic recombination; immunoglobulin variable region; recombination, genetic; nucleotide sequence; base sequence; immunoglobulin kappa chain; immunoglobulin light chain; human; article; support, non-u.s. gov't; support, u.s. gov't, p.h.s.; dysgammaglobulinemia; immunoglobulins, light chain; immunoglobulins, light-chain; immunoglobulins, kappa chain; immunoglobulins, kappa-chain; immunoglobulin j chain; immunoglobulins, j chain; immunoglobulins, j-chain
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