Failure of HY-specific thymocytes to escape negative selection by receptor editing.
Editing of autoreactive antigen receptors by secondary V(D)J recombination efficiently rescues B lymphocyte precursors from apoptosis induced by negative selection, but its role has not been rigorously assessed in T cell development. We therefore generated a transgenic mouse model in which self-reactive thymocytes could edit their TCR by secondary recombination at the TCR alpha locus. For this purpose, the V alpha J alpha exon of a male-specific TCR was inserted into the TCR alpha locus followed by Cre-loxP-mediated deletion of the TCR delta locus. In this model, only few thymocytes escaped negative selection by change of specificity, probably through recombination before encounter of autoantigen. In the absence of the restricting MHC element, however, developing thymocytes replaced the inserted TCR alpha exon efficiently.
Buch
Thorsten
T
Institute for Genetics, University of Cologne, Weyertal 121, D-50931 Cologne, Germany.
Rieux-Laucat
Frédéric
F
Förster
Irmgard
I
Rajewsky
Klaus
K
D000818:Animals; D001324:Autoantigens / Q000276:immunology; D001483:Base Sequence; D017637:Clonal Deletion; D005260:Female; D015332:Gene Rearrangement, alpha-Chain T-Cell Antigen Receptor; D006182:H-Y Antigen / Q000276:immunology*; D006720:Homozygote; D007144:Immunoglobulin J-Chains / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000235:genetics; D019426:Integrases / Q000378:metabolism; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009924:Organ Culture Techniques; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics / Q000378:metabolism; D011995:Recombination, Genetic; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology*; D014764:Viral Proteins / Q000378:metabolism
D001324:Autoantigens; D006182:H-Y Antigen; D007144:Immunoglobulin J-Chains; D007135:Immunoglobulin Variable Region; D016693:Receptors, Antigen, T-Cell, alpha-beta; D014764:Viral Proteins; C045073:Cre recombinase; D019426:Integrases