title: Evidence for expression of two distinct T cell receptor beta-chain transcripts in a human diphtheria toxoid-specific T cell clone.
abstract: We have cloned and sequenced the human T cell receptor alpha- and beta-chains cDNA present in a lambda gt10 library derived from a human CD4+ diphtheria toxoid-specific T cell clone, PH28. Two 1.3-kb beta-transcripts within frame V, D, J joining were found. These two functional beta-transcripts use two members of different V beta-families, V beta 3 and V beta 4, one joined to D beta 1-1, J beta 1-1, C beta 1, the other joined to D beta 1-1, J beta 2-1, C beta 2. Moreover, we have cloned the two different V beta germ-line counterparts whose sequences confirm that these two V beta are not pseudogenes. Analysis of T cell receptor beta and alpha rearrangements in PH28 showed that a single rearrangement on each chromosome could be assigned either at the J beta or the J gamma loci. These results strongly suggest an absence of allelic exclusion for 1.3-kb mRNA beta-transcripts in a human antigen-specific T cell clone.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002999:Clone Cells; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004168:Diphtheria Toxoid / Q000276:immunology; D006801:Humans; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics*; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D016693:Receptors, Antigen, T-Cell, alpha-beta; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D004168:Diphtheria Toxoid; D012333:RNA, Messenger; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D004247:DNA