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TCRA Gene Rearrangement in Immature Thymocytes in Absence of CD3, Pre-TCR, and TCR Signaling¹

Stéphane J. C. Mancini^*, Serge M. Candéias^2,*, James P. Di Santo, Pierre Ferrier, Patrice N. Marche^* and Evelyne Jouvin-Marche^*

^* Laboratoire d’Immunochimie, Commissariat à l’Energie Atomique-Grenoble, Département de Biologie Moléculaire et Structurale, Institut National de la Santé et de la Recherche Médicale U548, Université Joseph Fourier, Grenoble, France; Unité des Cytokines et Développement Lymphoïde, Département d’Immunologie, Institut Pasteur, Paris, France; and Centre d’Immunologie de Marseille-Luminy, Institut National de la Santé et de la Recherche Médicale-Centre National de la Recherche Scientifique, Marseille, France

During thymocyte differentiation, TCRA genes are massively rearranged only after productively rearranged TCRB genes are expressed in association with pT and CD3 complex molecules within a pre-TCR. Signaling from the pre-TCR via the CD3 complex is thought to be required to promote TCRA gene accessibility and recombination. However, ⁺ thymocytes do develop in pT-deficient mice, showing that TCR-chain genes are rearranged, either in CD4^-CD8^- or CD4⁺CD8⁺ thymocytes, in the absence of pre-TCR expression. In this study, we analyzed the TCRA gene recombination status of early immature thymocytes in mutant mice with arrested thymocyte development, deficient for either CD3 or pT and c expression. ADV genes belonging to different families were found rearranged to multiple AJ segments in both cases. Thus, TCRA gene rearrangement is independent of CD3 and c signaling. However, CD3 expression was found to play a role in transcription of rearranged TCR-chain genes in CD4^-CD8^- thymocytes. Taken together, these results provide new insights into the molecular control of early T cell differentiation.

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