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. 1993 Nov;12(11):4347-55.
doi: 10.1002/j.1460-2075.1993.tb06119.x.

T cell development in mice lacking the CD3-zeta/eta gene

M Malissen  1 , A Gillet, B Rocha, J Trucy, E Vivier, C Boyer, F Köntgen, N Brun, G Mazza, E Spanopoulou, et al.
Affiliations

T cell development in mice lacking the CD3-zeta/eta gene

M Malissen et al. EMBO J. 1993 Nov.

Abstract

The CD3-zeta and CD3-eta polypeptides are two of the components of the T cell antigen receptor (TCR) which contribute to its efficient cell surface expression and account for part of its transducing capability. CD3-zeta and CD3-eta result from the alternative splicing of a single gene designated CD3-zeta/eta. To evaluate the role of these subunits during T cell development, we have produced mice with a disrupted CD3-zeta/eta gene. The analysis of thymocyte populations from the CD3-zeta/eta-/- homozygous mutant mice revealed that they have a profound reduction in the surface levels of TCR complexes and that the products of the CD3-zeta/eta gene appear to be needed for the efficient generation and/or survival of CD4+CD8+ thymocytes. Despite the almost total absence of mature single positive thymocytes, the lymph nodes from zeta/eta-/- mice were found to contain unusual CD4+CD8- and CD4-CD8+ single positive cells which were CD3-. In contrast to the situation observed in the thymus, the thymus-independent gut intraepithelial lymphocytes present in zeta/eta-/- mice do express TCR complexes on their surface and these are associated with Fc epsilon RI gamma homodimers. These results establish an essential role for the CD3-zeta/eta gene products during intrathymic T cell differentiation and further emphasize the difference between conventional T cells and thymus-independent gut intraepithelial lymphocytes.

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