title: Structure and expression of kappa-chain genes in two IgE-producing rat immunocytomas.
abstract: The light chain expression in two IgE-producing rat immunocytomas, IR2 and IR162, was studied. Both immunocytomas produce light chains of the kappa type. The kappa chains were characterized at the protein level by sodium dodecylsulfate (SDS)-polyacrylamide gel electrophoresis (PAGE) and amino acid (aa) sequencing. cDNA clones corresponding to the kappa-chain mRNA were also prepared and sequenced. The results showed that rat kappa chains have the same structure as their mouse counterparts with respect to signal sequence cleavage, somatic mutations in the V-J region and invariance of all the aa positions which are strongly conserved in the frame work regions of mouse V kappa chains (greater than 95% conservation). Results from studies on kappa-chain transcription lend support to the allelic exclusion model with only one functionally expressed light chain in each immunocytoma.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D004262:DNA Restriction Enzymes; D005796:Genes; D007073:Immunoglobulin E / Q000235:genetics*; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D008223:Lymphoma / Q000235:genetics* / Q000276:immunology; D009693:Nucleic Acid Hybridization; D051381:Rats; D014158:Transcription, Genetic
chemical_list: D007145:Immunoglobulin kappa-Chains; D007073:Immunoglobulin E; D004247:DNA; D004262:DNA Restriction Enzymes