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From the * Institut Necker, Institut National de la Santé et de la Recherche Médicale, 373, F-75730
Paris, Cedex 15, France; The development of pre-T cells with productive TCR-
Hôpital Necker-Enfants Malades, Institut National de la Santé et de la
Recherche Médicale, 429, F-75743 Paris, France; and § Basel Institute for Immunology, CH-4005
Basel, Switzerland
rearrangements can be mediated by
each the pre-T cell receptor (pre-TCR), the TCR-
as well as the TCR-
, albeit by distinct mechanisms. Although the TCR-
affects CD4
8
precursor cells irrespective of their
rearrangement status by TCR-
mechanisms not involving TCR-
selection, both the preTCR and the TCR-
select only cells with productive TCR-
genes for expansion and
maturation. The TCR-
appears to be much less effective than the pre-TCR because of the
paucity of TCR-
proteins in TCR-
-positive precursors since an early expressed transgenic
TCR-
can largely substitute for the pre-TCR. Thus, the TCR-
can assume a role not
only in the rescue from programmed cell death of CD4+8+ but also of CD4
8
thymocytes.
In evolution this double function of the TCR-
may have been responsible for the maturation of 
T cells before the advent of the pre-TCR-
chain.
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