Double recombination of a single immunoglobulin kappa-chain allele: implications for the mechanism of rearrangement.
DNA fragments containing immunoglobulin kappa-chain sequences from two different plasmacytomas (PC 3609 and PC 7043) were found by blot-hybridization studies to be dissociated from germ-line sequences on both the 3' and 5' ends. These fragments were cloned, sequenced, and found to contain the structural features of a product of two recombination events. Each contained a variable (V kappa) gene segment recombined with a joining (J kappa) gene segment followed by the characteristic kappa light chain V-J reciprocal structure, a 5' J kappa flanking sequence joined to a 3' V kappa flanking sequence. These segments of DNA represent double recombination products (DRPs) of the same kappa-chain allele. The DRP from PC 3609 contains a normal V-J1 recombination, while the DRP from PC 7043 contains an aberrant V-J2 recombination, resulting in a frameshift. The reciprocal structure in the PC 3609 DRP is the result of a V-J2 recombination; the reciprocal structure in the DRP of PC 7043 is the result of a V-J3 recombination and appears to have been derived directly from the productive kappa-chain gene recombination in that plasmacytoma. These products demonstrate the capacity of a single kappa light chain immunoglobulin allele to undergo multiple V-J recombinations. Furthermore, the presence of a V-J recombination and its reciprocal product in the same cell is inconsistent with a segregating mechanism, such as sister chromatid exchange, but is consistent with an inversion mechanism.
Feddersen
R M
RM
Van Ness
B G
BG
D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004262:DNA Restriction Enzymes; D005796:Genes; D007147:Immunoglobulin Light Chains / Q000235:genetics*; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D051379:Mice; D010954:Plasmacytoma / Q000276:immunology; D011995:Recombination, Genetic
D007147:Immunoglobulin Light Chains; D007145:Immunoglobulin kappa-Chains; D004262:DNA Restriction Enzymes