T cell development in TCR beta enhancer-deleted mice: implications for alpha beta T cell lineage commitment and differentiation

• Published in: The Journal of immunology (1950) Vol. 165; no. 3; pp. 1364 - 1373
• Main Authors: Leduc, I, Hempel, W M, Mathieu, N, Verthuy, C, Bouvier, G, Watrin, F, Ferrier, P
• Format: Journal Article
• Language: English
• Published: United States 01-08-2000
• Subjects: Animals; Cell Differentiation - genetics; Cell Differentiation - immunology; Cell Lineage - genetics; Cell Lineage - immunology; Enhancer Elements, Genetic - genetics; Enhancer Elements, Genetic - immunology; Flow Cytometry; Gene Deletion; Gene Expression Regulation - genetics; Gene Expression Regulation - immunology; Gene Rearrangement, delta-Chain T-Cell Antigen Receptor - genetics; Gene Rearrangement, gamma-Chain T-Cell Antigen Receptor - genetics; Genes, T-Cell Receptor beta - genetics; Genes, T-Cell Receptor delta - genetics; Genes, T-Cell Receptor gamma - genetics; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Mice, Knockout; Receptors, Antigen, T-Cell, alpha-beta - biosynthesis; Receptors, Antigen, T-Cell, alpha-beta - deficiency; Receptors, Antigen, T-Cell, alpha-beta - genetics; Receptors, Antigen, T-Cell, gamma-delta - biosynthesis; Receptors, Antigen, T-Cell, gamma-delta - genetics; T-Lymphocyte Subsets - cytology; T-Lymphocyte Subsets - immunology; T-Lymphocyte Subsets - metabolism; Thymus Gland - cytology; Thymus Gland - immunology; Thymus Gland - metabolism
• ISSN: 0022-1767
• DOI: 10.4049/jimmunol.165.3.1364

T cell differentiation in the mouse thymus is an intricate, highly coordinated process that requires the assembly of TCR complexes from individual components, including those produced by the precisely timed V(D)J recombination of TCR genes. Mice carrying a homozygous deletion of the TCR beta transcriptional enhancer (E beta) demonstrate an inhibition of V(D)J recombination at the targeted TCR beta locus and a block in alpha beta T cell differentiation. In this study, we have characterized the T cell developmental defects resulting from the E beta-/- mutation, in light of previously reported results of the analyses of TCR beta-deficient (TCR beta-/-) mice. Similar to the latter mice, production of TCR beta-chains is abolished in the E beta-/- animals, and under these conditions differentiation into cell-surface TCR-, CD4+CD8+ double positive (DP) thymocytes depends essentially on the cell-autonomous expression of TCR delta-chains and, most likely, TCR gamma-chains. However, contrary to previous reports using TCR beta-/- mice, a minor population of TCR gamma delta+ DP thymocytes was found within the E beta-/- thymi, which differ in terms of T cell-specific gene expression and V(D)J recombinase activity, from the majority of TCR-, alpha beta lineage-committed DP thymocytes. We discuss these data with respect to the functional role of E beta in driving alpha beta T cell differentiation and the mechanism of alpha beta T lineage commitment.