title: RNA splicing mutation in an aberrantly rearranged immunoglobulin lambda I gene.
abstract: The mouse cell line MOPC 315 is an IgA (lambda II)-producing myeloma. We have studied a derivative of MOPC 315 that secretes normal lambda II chains but no heavy chain. This derivative, MOPC 315-26, was found to contain a rearranged lambda I gene in addition to a rearranged lambda II gene. The rearranged lambda I gene was cloned into bacteriophage lambda DNA and its structure was studied. The lambda I gene was found to have arisen by an aberrant recombination event that resulted in a single base insertion at the site of V-J region joining. In addition, the gene contained numerous point mutations in the vicinity of the junction of the V and J regions. Two point mutations occurred in the donor splice sequence normally used for the removal of the intron between the J and C regions, suggesting that the RNA synthesized from the aberrantly rearranged lambda I gene would be unable to undergo proper RNA splicing.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D007070:Immunoglobulin A / Q000235:genetics*; D051379:Mice; D009154:Mutation; D010954:Plasmacytoma; D012313:RNA / Q000235:genetics*; D011995:Recombination, Genetic
chemical_list: D007070:Immunoglobulin A; D012313:RNA; D004262:DNA Restriction Enzymes